The best Synthflow alternatives
ranked by who each one suits.

The best Synthflow alternatives depend on who is buying. A contact centre wants a different tool from a clinic, a roofer or an agency with ten local clients. Here are six options, from self-serve voice builders and developer platforms to one agent that answers calls, texts, email, website chat and DMs, with who each one suits and how each one charges.

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Every channel wired into one agent and out to the tools behind it: email, SMS, phone, Instagram, Messenger, WhatsApp, Telegram, LINE, Slack, Discord, X, Reddit, Bluesky, website chat, campaign sequences and follow-ups on one side; HubSpot, GoHighLevel, Housecall Pro, ServiceTitan, Jobber, Google Calendar, Microsoft 365, Calendly, HubSpot Meetings, Zoho Bookings, Acuity Scheduling, Cal.com, Square Appointments, Stripe, Shopify, WooCommerce, Wix and Squarespace on the other.

Why people start looking for a Synthflow alternative

Synthflow describes itself as an enterprise-ready voice AI platform for automated phone calls, and its homepage calls it an end-to-end platform with in-house telephony and a deployment framework it names BELL: build, evaluate, launch, learn. Teams design agents in a visual Flow Designer, connect APIs along the way, and deploy across voice, chat, SMS and more, with over 200 integrations spanning CRMs, contact-centre platforms, calendars and data tools. The industries on its site are contact centres and BPOs, healthcare, financial services, retail, real estate and telecoms. For an operation running large call volumes, that is a coherent offer.

The search for Synthflow alternatives usually starts on its pricing page. At the time of writing, the only plan published there is an enterprise contract, starting at $30,000 a year, with the final price scoped around call volume, concurrency, telephony setup, integrations, security needs and launch support. Implementation, onboarding, testing and training are part of it. That suits a buyer who wants a vendor to deploy alongside them. It is a different proposition for a clinic, a trades business or a small agency that wanted to build an agent this afternoon and pay for it monthly, and those buyers are a large share of the people typing the search.

There is a second group, too: people who want the phone answered and also want the rest of the customer handled. A voice platform is built around the call. The same customer also emails, sends an Instagram DM at 10pm, opens the chat bubble on the website, and needs following up when they do not pick up. So the alternatives fall into three shapes: voice platforms with a different pricing model, AI receptionists sized for a small business, and one agent that works every channel from a single knowledge base.

This page ranks six options, Bold Agent Kit first, and says for each one who it suits, how it charges and when to choose it over the others. Every statement about another tool comes from that tool's own website, checked on the date shown under the summary table. Where Synthflow, or another tool on the list, is the better fit for a particular buyer, the entry says so plainly.

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Enterprise contracts from $30,000 a yearAt the time of writing, the only plan on Synthflow's pricing page.

Built for contact-centre scaleIn-house telephony, SIP trunks, and connections to Genesys, Avaya, Cisco and RingCentral.

A visual Flow DesignerEvery step of the conversation defined, with APIs connected along the way.

Built around the phone callVoice first, with chat, SMS and more listed on its site.

Self-serve options existSeveral tools below publish monthly plans or per-minute rates you can start on today.

Three shapes of alternativeA voice platform, an AI receptionist, or one agent across every channel.

Four reasons people pass on Synthflow, or move off it

None of these is a fault in Synthflow. Each follows from its published scope and the way it prices, and each points to a different kind of alternative.

The published price is an enterprise contract

At the time of writing, Synthflow's pricing page lists enterprise contracts starting at $30,000 a year, with the final figure scoped around call volume, concurrency, telephony, integrations, security and launch support. That is how enterprise software is usually bought, and it comes with implementation and onboarding. A business that wants to go live this week and pay month by month, without a scoping conversation first, tends to look for a tool with a plan it can buy on its own.

It is built for large phone operations

Its site is written for contact centres, BPOs and enterprise teams handling high call volumes: in-house telephony, the option to connect your own carriers or SIP trunks, and connections to contact-centre systems such as Genesys, Avaya, Cisco and RingCentral. SLAs, a security review and launch support are part of the offer. A five-person firm rarely needs any of that, and often prefers a product sized to one phone line, one calendar and one owner.

A flow designer is still a build

The visual Flow Designer lets a team define every step of a conversation and connect APIs to act on it. That is precise control, and it is also a piece of work: someone designs the flow, tests the branches, and keeps it current when prices, hours or services change. An owner who wanted to write down their hours and prices and switch the phone on usually looks for a receptionist product, or for an agent briefed from a knowledge base instead of drawn as a flow.

The call is only one part of the customer

Synthflow's site describes agents across voice, chat, SMS and more, built around the automated phone call. Businesses that want the same agent to answer email to info@, the chat on their website and DMs on Instagram, WhatsApp and Messenger from one knowledge base, and to run follow-up sequences of email, text and call steps that stop when the person replies, look for tools built around the whole customer rather than the call.

What to look for in a Synthflow alternative

Start with the job, not the feature list. Three questions separate the options on this page quickly, and the answers are different for a contact centre, an agency and a business with one phone line.

01 / Price

A price you can start on

Does the tool publish a plan you can buy without a sales call, and what does it charge by: the minute, the call, the unique customer, or the account? Per-minute pricing tracks usage, so a busy month costs more; a flat price stays where it is. Then check what is billed on top: the language model, the voice, telephony, extra concurrent calls and phone numbers are separate lines on several of the tools below.

02 / Build

Who is going to build it

A developer platform gives you an API and SDKs. A flow builder gives you a canvas of steps and branches. A receptionist product asks for your hours, your FAQs and a forwarded number. An agent briefed from a knowledge base sits between those. Choose the one that matches the person who will own the agent after launch day, because that is who will be changing it every time a price or an opening hour moves.

03 / Reach

Where your customers actually are

If the only job is the phone, a voice platform or an AI receptionist will do it. If the same people also email, text, chat on your website and message you on social, and need following up when they go quiet, one agent across those channels with one contact record saves stitching three tools together. Check the calendars and CRMs it connects to as well, because a booking only counts if it lands in the diary you use.

The best Synthflow alternatives, ranked

Six options, Bold Agent Kit first. The rest are ordered by how closely they fit the typical person searching for a Synthflow alternative: a business or agency that wants a voice agent it can set up without an engineering team and pay for without an enterprise contract. Self-serve platforms with a visual builder come next, then the developer and enterprise platforms, then an AI receptionist for those who only ever needed the phone answered.

We make Bold Agent Kit, which is why it is first on this list. Every other entry is described from its own website, including when it is the better choice.

01 / Best for one agent on calls, texts, email, chat and DMs, at a flat price

Bold Agent Kit

Bold Agent Kit is a finished AI agent, not a platform to build one on. You brief it the way you would brief a new member of staff: documents, Q&A pairs, your prices and hours as data points, the pages of your site it may link to, and instructions for how to greet people and when to fetch you. It answers and places calls on a number in your own Twilio account, with separate switches for answering and dialling, hears and speaks in real time on the fastest model your provider offers, and keeps a recording and a transcript of every call.

Where it differs from Synthflow is scope and price. The same agent, from the same knowledge base, answers texts on the same number, email from your own mailboxes, a chat widget on your site, and Messenger, Instagram, WhatsApp and eight more DM platforms. It books real open slots into one of eight calendars, reads HubSpot, GoHighLevel, Jobber, Housecall Pro or ServiceTitan before it answers, and runs campaigns of email, text and call steps that stop on a reply, a booking or an opt-out. It is $25 a month or $200 a year for the whole account, with unlimited agents, on your own AI key with one of sixteen providers, and there is no charge per minute, per call, per message or per seat from us.

Choose it if you are a business or an agency that wants the phone answered and the rest of the customer handled by one agent, set up this week, at a price that does not move with the minutes. Look further down the list if you need live call transfer, which it does not offer, human receptionists behind the AI, which it does not have, or a platform to build your own voice product on, which it is not.

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Best forone agent on calls, texts, email, chat and DMs, at a flat price

Pricing$25 a month or $200 a year for the account, with a 7-day free trial; carrier and AI usage billed to you at cost

ChannelsCalls and texts on your own number, email, website chat, eleven DM platforms

Your own number and voiceTwilio for calls; voices from Google, Amazon Polly or ElevenLabs, or one you cloned on your own ElevenLabs or Fish Audio key.

Fifteen channels, one agentCalls, texts, email, website chat and eleven DM platforms from one knowledge base.

A flat plan$25 a month for the account, unlimited agents. Your carrier and AI provider bill you at cost.

No live transferIt takes the caller's details and puts the call in your inbox; it cannot put a call through.

02 / Best for building voice agents on a visual canvas, paid by the minute

Retell AI

Retell AI is an AI voice agent platform for automating phone conversations, and of everything on this list it is closest to Synthflow in shape. Its site describes a no-code visual builder where teams design every step of the conversation on a drag-and-drop canvas, alongside APIs and SDKs for programmatic control. Agents handle inbound and outbound calls, SMS and web or in-app chat, read customer context from CRMs, calendars and knowledge bases before and during a call, and can brief a human agent before handing a caller over.

The main difference from Synthflow is how you pay. Retell is pay as you go, with no commitment and $10 in free credits to start. At the time of writing, its published rates for voice agents start at $0.07 a minute and run to $0.31, depending on the model, voice and telephony chosen, with chat charged per message, 20 concurrent calls included and more concurrency charged monthly. Numbers can be Retell's own, or your existing ones over SIP trunking or through Twilio and Vonage, and its voices include ElevenLabs, Cartesia, OpenAI, MiniMax and Fish.

Choose Retell AI if you liked the idea of a visual flow builder and want to start today on usage-based pricing, if you need live handoffs to human agents, or if your call volume makes a per-minute platform with its own telephony options the natural fit. Its site is built around voice and chat, so if you also want email and social DMs answered by the same agent, check its current channel list against yours.

Bold Agent Kit vs Retell AI

Best forbuilding voice agents on a visual canvas, paid by the minute

PricingPay as you go, with $10 in free credits; at the time of writing, published voice agent rates start at $0.07 a minute; enterprise pricing on request

ChannelsInbound and outbound calls, SMS, web and in-app chat

Visual builder and APIsA drag-and-drop canvas for conversation steps, with APIs and SDKs for developers.

Pay as you goNo commitment and $10 in free credits, with rates set by the model, voice and telephony you pick.

Handoff to a personIts agents can brief a human agent and confirm before connecting the caller.

A rate built from partsVoice infrastructure, model, voice and telephony each add to the per-minute figure.

03 / Best for voice and chat agents with a free plan and monthly tiers

ElevenAgents

ElevenAgents is ElevenLabs' platform for conversational agents. Its site describes configuring, deploying and monitoring agents in more than 70 languages across voice, chat and email, and says you can build your first agent in minutes with no engineering required. You set the voice, language, knowledge base, system prompt and workflows, then connect tools. For developers there are SDKs, and the docs describe a visual workflow builder, SIP trunk connections, a native Twilio integration and batch calling.

It suits the Synthflow shopper who wants to start small. ElevenAgents has a free plan with 15 minutes, and at the time of writing its paid plans start at $6 a month, each with included call minutes, extra minutes charged by the minute and burst pricing above your concurrency limit. The language model and any telephony are billed separately on top, based on usage. Its page lists connectors for Twilio, Salesforce, HubSpot, Zendesk, Stripe, Shopify, Genesys, Amazon Connect and Zapier, and it is LLM-agnostic, so you can bring your own model.

Choose ElevenAgents if the voice itself matters most to you, you want ElevenLabs' voice library in many languages, and you want a self-serve plan to try before you commit. Budget for the model and telephony as separate lines on top of the plan, and check which plan carries the concurrency your busiest hour needs.

Bold Agent Kit vs ElevenAgents

Best forvoice and chat agents with a free plan and monthly tiers

PricingA free plan with 15 minutes; at the time of writing, paid plans start at $6 a month with included minutes; the LLM and telephony billed on top by usage

ChannelsPhone, web, mobile, WhatsApp, SMS, email and chat

ElevenLabs voicesA large voice library across more than 70 languages, from the company that makes it.

A free plan to start15 minutes included, then monthly plans with included minutes.

Bring your own modelLLM-agnostic, with model usage billed on top of the plan.

Several usage linesPlan, extra minutes, burst minutes, the model and telephony are billed separately.

04 / Best for developers building voice agents into their own product

Vapi

Vapi describes itself as a platform to build, deploy and improve voice agents, for builders from individual developers to Fortune 100 companies. It is API-native, with a dashboard for configuration and monitoring, and you configure everything from the voice and the conversation flow to telephony. Its site lists more than 30 services it connects to, including OpenAI, Anthropic, Gemini and Groq for models, ElevenLabs and Deepgram for voice and speech, Salesforce, HubSpot and Google Calendar for business tools, and Twilio and Telnyx for telephony.

Its pricing is published and usage-based. On the Build plan, hosting is $0.05 a minute for calls and $0.005 a message for chat and SMS at the time of writing, with ten concurrent lines included and each extra line charged by the month. Speech and model costs are passed on at cost, or nothing if you bring your own API key. The Scale plan is an annual contract with a fixed platform fee, committed volume and volume-based per-minute pricing, with compliance add-ons.

Choose Vapi if you have developers and you are building voice into your own application or service, so you want full control of every provider and every step and an API to drive it all. If nobody on the team writes code, a builder or a finished agent higher up this list is the shorter route to a phone that gets answered.

Bold Agent Kit vs Vapi

Best fordevelopers building voice agents into their own product

PricingUsage-based: at the time of writing, hosting is $0.05 a minute for calls and $0.005 a message for chat and SMS; model costs at cost, or nothing on your own key

ChannelsInbound and outbound calls, chat and SMS

API-nativeEvery part configurable, with a dashboard for monitoring.

Bring your own keyModel and speech costs passed on at cost, or nothing on your own key.

Wide provider choiceModels, voices and telephony from more than 30 services.

Needs a builderTools, integrations and edge cases are yours to design and maintain.

05 / Best for enterprise phone agents in regulated industries

Bland AI

Bland describes itself as an enterprise voice AI platform for phone agents, built for regulated industries including healthcare, insurance, financial services and logistics. Its site says it runs on its own infrastructure, with models made for phone calls and data that does not pass through third parties, and that one agent can work across voice, SMS, iMessage and web chat with shared memory. Its Norm tool is described as letting you build production-ready agents without prior experience, and it connects to Twilio, Salesforce, HubSpot and Slack among others.

Pricing is per minute, with the model, speech and voice included and no token charges. At the time of writing, the Start plan has no platform fee, 10 concurrent calls and a cap of 100 calls a day; the Build plan is $299 a month with lower per-minute and transfer rates, 50 concurrent calls and 2,000 calls a day; and enterprise is contracted to your volume, with on-premises or VPC deployment, a forward-deployed engineer and data residency available. Call transfers are charged per minute on every plan.

Choose Bland AI if you are in a regulated industry, security and data handling drive the decision, and you want the option of a deployment on your own infrastructure with an engineer alongside you. Its Start plan also lets a smaller team try it without a platform fee before deciding whether the higher plans are worth it.

Bold Agent Kit vs Bland AI

Best forenterprise phone agents in regulated industries

PricingPer minute, with model, speech and voice included; at the time of writing, its Start plan has no platform fee and its Build plan is $299 a month; enterprise by contract

ChannelsVoice, SMS, iMessage and web chat

Its own infrastructureModels built for phone calls, with on-premises or VPC deployment on enterprise.

One rate per minuteModel, speech and voice included in the rate, with no token charges.

Several channelsVoice, SMS, iMessage and web chat, with shared memory across them.

Caps set by planCalls a day and concurrency depend on the plan, with enterprise sized to volume.

06 / Best for small businesses that only wanted an AI receptionist

My AI Front Desk

My AI Front Desk, which its site now calls Frontdesk AI, is an AI front office for small and medium businesses. Its site says it answers, qualifies, books and follows up with customers across voice, text and chat, and lists an AI receptionist, a texting agent, a web chatbot, outbound calls and texts, an email agent, a built-in CRM with customer memory across channels, ticketing and call transfers to people.

It is on this list for the Synthflow shopper who really wanted a receptionist rather than a platform. Its Business-in-a-Box plan includes a monthly allowance of voice minutes, texts and chatbot conversations, with usage beyond it drawn from credits. At the time of writing its published plans start at $79 a month billed annually, with a 7-day free trial; a partner and enterprise tier is priced by volume, and there is a white-label resale programme. It connects to Zapier and names industry systems such as Yardi, AppFolio, Buildium, SimplePractice, Jane App, Shopify and WooCommerce.

Choose My AI Front Desk if you run a small business, you want a receptionist set up in minutes rather than a flow to design, and you need live call transfers or one of the industry systems it names. If your volume varies a lot month to month, look at how the credits work for your busiest month.

Bold Agent Kit vs My AI Front Desk

Best forsmall businesses that only wanted an AI receptionist

PricingA monthly plan with included voice minutes, texts and chats, overage by credits; at the time of writing, published plans start at $79 a month billed annually; 7-day free trial

ChannelsCalls, texts, web chat, email, outbound calls and texts

Quick to set upIts pricing page cites a five-minute setup.

More than the phoneVoice, texts, web chat, email and outbound from one product.

Industry integrationsProperty management, therapy practice and store systems among those it names.

Allowances and creditsMinutes, texts and chats included monthly, with overage drawn from credits.

Synthflow alternatives at a glance

Who each option suits, what it covers and how it charges, each taken from the vendor's own website.

Tool	Best for	Channels	How it charges
Bold Agent Kit	one agent on calls, texts, email, chat and DMs, at a flat price	Calls and texts on your own number, email, website chat, eleven DM platforms	$25 a month or $200 a year for the account, with a 7-day free trial; carrier and AI usage billed to you at cost
Retell AI	building voice agents on a visual canvas, paid by the minute	Inbound and outbound calls, SMS, web and in-app chat	Pay as you go, with $10 in free credits; at the time of writing, published voice agent rates start at $0.07 a minute; enterprise pricing on request
ElevenAgents	voice and chat agents with a free plan and monthly tiers	Phone, web, mobile, WhatsApp, SMS, email and chat	A free plan with 15 minutes; at the time of writing, paid plans start at $6 a month with included minutes; the LLM and telephony billed on top by usage
Vapi	developers building voice agents into their own product	Inbound and outbound calls, chat and SMS	Usage-based: at the time of writing, hosting is $0.05 a minute for calls and $0.005 a message for chat and SMS; model costs at cost, or nothing on your own key
Bland AI	enterprise phone agents in regulated industries	Voice, SMS, iMessage and web chat	Per minute, with model, speech and voice included; at the time of writing, its Start plan has no platform fee and its Build plan is $299 a month; enterprise by contract
My AI Front Desk	small businesses that only wanted an AI receptionist	Calls, texts, web chat, email, outbound calls and texts	A monthly plan with included voice minutes, texts and chats, overage by credits; at the time of writing, published plans start at $79 a month billed annually; 7-day free trial

For comparison, Synthflow's pricing page lists enterprise contracts that, at the time of writing, start at $30,000 a year, scoped to call volume, concurrency, telephony, integrations and security. Per-minute tools cost more in a busy month and less in a quiet one; a flat plan stays the same. Carrier, model and voice costs sit outside several of these prices, so compare the whole bill for your busiest month, not the headline figure.

We checked each tool’s public website on 11 September 2026 for this page. Plans and features change, so check each vendor’s own site for the current detail. Product names are trademarks of their owners, and Bold Agent Kit is not affiliated with or endorsed by any of them.

Which Synthflow alternative should you choose?

If you are a small business or an agency, and what you need is the phone answered, the enquiry booked and the customer followed up by text, email, website chat and DM, start with Bold Agent Kit: one agent on your own number and your own AI key, fifteen channels, $25 a month for the account. If you only need a receptionist, and live transfers or one of its industry integrations matter, My AI Front Desk is sized for that job.

If you liked Synthflow's builder and want the same kind of control on a self-serve plan, Retell AI and ElevenAgents are the nearest in shape: Retell for a visual canvas and pay-as-you-go minutes, ElevenAgents for ElevenLabs' voices and a free plan to try. If you have developers building voice into a product of your own, Vapi gives them an API and a free hand with every provider.

And if you are what Synthflow is built for, a contact centre, a BPO or an enterprise with high call volumes, contact-centre systems and a security review to pass, Synthflow may well be the right answer. In that case Bland AI is the alternative to compare, particularly when regulated data and a deployment on your own infrastructure are the deciding factors.

Start 7-day free trial Bold Agent Kit vs Synthflow

Powered by your own keys

Each agent uses a model on your own API key, in the same way it sends from your own mailbox and your own phone number. Sixteen providers are supported: OpenAI, Anthropic, Gemini, xAI and Mistral; DeepSeek, GLM, Kimi, Qwen and MiniMax; Groq, Together, Fireworks and OpenRouter; and Ollama or any other OpenAI-compatible endpoint you host yourself.

Bring your own credentials and you own the whole stack: your model provider, your mailboxes, your carrier, your CRM. We charge for the software and nothing else — no token markup, no metering, no credit packs — so your provider bills you direct at their rates, usually a few dollars a month per agent.

Your key, sixteen providersOpenAI, Anthropic, Gemini, xAI, Mistral, DeepSeek, Groq, OpenRouter and more.

Or a model you hostOllama, vLLM, or any other OpenAI-compatible endpoint of your own.

The fast model on callsIt switches automatically, because a phone call cannot wait for a sentence.

No metering from usNo markup, no credit packs, no per-message billing. A busy month costs no more.

Keys stored encryptedYour credentials are yours; we never send them anywhere but your provider.

Sixteen model providers, on your own key

OpenAI
Anthropic
Gemini
xAI
Mistral
DeepSeek
GLM
Kimi
Qwen
MiniMax
Groq
Together
Fireworks
OpenRouter
Ollama
Any OpenAI API

One plan. Everything in it. Monthly or yearly.

No seat tiers, no credit packs, no per-agent or per-channel pricing, and nothing held back behind an enterprise call.

Agents
How many	Unlimited — one per business, brand or job
Shared brain	The same identity, instructions and knowledge on every channel
Knowledge base	Documents, Q&A pairs, data points and pages of your own site
Isolation	One agent's content is never used to reply for another
Client seats	Invite a client into one agent, with their own login
Channels
Email	As many mailboxes per agent as you connect, rotated by campaigns
Text messages	Nine providers — Twilio, Telnyx, SimpleTexting, Plivo, Vonage, Sinch, Bandwidth, MessageBird, ClickSend
Phone calls	Answering and dialling, with recordings and transcripts
Transcription	Google, or Deepgram nova-3 on your own key
Voices	Google, Amazon Polly and ElevenLabs, or your own ElevenLabs / Fish Audio account
Voice cloning	Record a voice in the browser and clone it on your ElevenLabs or Fish Audio key
Website chat	A widget on your site with your colour, image and greeting
Social DMs	Messenger, Instagram, WhatsApp, Telegram, LINE, Viber, Slack, Discord, Bluesky, Reddit, X
Inbox
One list	Every channel's conversations together, newest first, tagged by channel
Filters	By channel, by mailbox or number, or by agent
Takeover	Reply yourself and the agent stands down on that thread
Hand back	Return the thread to the agent when you are done
Campaigns
Multichannel sequences	Email, text and call steps in one campaign, each with its own timing
Send conditions	Send a step only if they opened, did not open, clicked or did not click
Schedule	The days, hours and time zone anything may be sent
Stop rules	A reply, a booking or an opt-out on any channel ends the sequence
Pacing	Per-mailbox and per-number hourly limits, pausable and resumable
Review before start	The full plan is shown; a campaign sends nothing until you start it
Templates	Email, text and call scripts, saved once and reused
Analytics
Funnel	Reached, replied, visited, converted, plus value won and time to convert
By channel	Where each person started, and the channel they converted on
Pages	Which pages known people read, and how many of them converted
Journeys	One row per person: every message, visit, call and booking in order
Goals	A page rule or a manual "won", each with a dollar value
Triggers	A known person returns to a page — notify you, or send a follow-up
Open and click tracking	Recorded per campaign and added to that person's history
Integrations
Calendars	Google, Microsoft 365, Calendly, Cal.com, Acuity, Zoho, Square, HubSpot Meetings
CRMs and commerce	HubSpot, GoHighLevel, Housecall Pro, ServiceTitan, Jobber, Stripe, Shopify, WooCommerce, Wix, Squarespace
Booking	Real open slots offered, and only an offered slot can be booked
CRM import	Import a segment of customers into a contact list
Deliverability and compliance
Mailbox warm-up	Ramped sending across the network, with spam rescue and replies
Health score	SPF, DKIM, DMARC, bounce rate and inbox placement, with reasons
Auto-rest	A failing address is removed from rotation automatically
Unsubscribes	One click, honoured automatically, including on queued mail
Reply limits	One reply per thread, per-sender daily and per-channel hourly caps
Filtering	Bounces, out-of-office and no-reply addresses ignored
List building
Contact extraction	Emails, phone numbers and social profiles, on any site. Unlimited.
Deep scan	Follows the pages of a domain most likely to carry contact details
Domain queue	Load a CSV of sites and work through them one at a time
Contacts and lists	Unlimited, by email or phone, with CSV import and export
AI
Your own key	Sixteen providers, including any OpenAI-compatible endpoint you host
What we charge for AI	Nothing — no markup, no metering, no credit packs
On calls	Uses your provider's fastest model automatically
Account
Platforms	Chrome side panel and web dashboard on one login
Members' forum	Six boards, visible only once you are signed in
Referral program	$50 a year per referral ($5 a month), recurring for the life of the account
Support	support@boldagents.co

Monthly Annual save 33%

$25/ month

$200/ year

Billed monthly. No add-ons, no seat tiers. Cancel anytime.

$16.67 a month, billed once a year. No add-ons, no seat tiers. Cancel anytime.

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Before you switch

What is the best Synthflow alternative?

It depends on who is buying. For a small business or an agency that wants the phone answered, the booking made and the customer followed up by email, text, chat and DM, Bold Agent Kit is the closest fit: one agent on your own number and AI key, at $25 a month for the account. For a team that liked Synthflow's builder and wants a self-serve plan, Retell AI and ElevenAgents are the nearest in shape. Developers building voice into their own product should look at Vapi, regulated enterprises at Bland AI, and a small business that only wants a receptionist at My AI Front Desk.

Why do people switch from Synthflow?

Mostly because of fit rather than fault. At the time of writing, Synthflow's pricing page lists enterprise contracts that start at $30,000 a year, scoped with its sales team, which is a natural fit for contact centres and a large commitment for a small business. The product is built for high-volume phone operations, with in-house telephony, SIP and contact-centre integrations, and a visual Flow Designer that someone has to design and maintain. Buyers who want a self-serve plan, a simpler setup, or one agent that also covers email, website chat and social DMs tend to look elsewhere.

How is Bold Agent Kit different from Synthflow?

Synthflow is a voice AI platform for enterprise phone operations, sold on scoped contracts, with a flow designer, its own telephony and documented live call transfer. Bold Agent Kit is a finished agent for businesses and agencies: you brief it from a knowledge base, it answers and places calls on your own Twilio number, and the same agent answers texts, email, website chat and eleven DM platforms, books real calendar slots and runs follow-up campaigns. It is $25 a month or $200 a year for the account, on your own AI key, and it cannot transfer a live call. The full side-by-side is on our Bold Agent Kit vs Synthflow page.

Is there a free Synthflow alternative?

Some have a free way in. ElevenAgents has a free plan that includes 15 minutes of calls, with paid plans above it. Retell AI gives new users $10 in free credits on its pay-as-you-go pricing. Bland AI's Start plan has no platform fee, though calls on it are charged by the minute. None of them stays free once real calls are running, because minutes, models and telephony all cost something. Bold Agent Kit has a 7-day free trial, then costs $25 a month for the account, with your carrier and your AI provider billing you directly at cost.

How do I move my agent from Synthflow to another tool?

Collect what the agent knows before anything else: the prompt, the branches of the flow, the answers it gives, the prices and hours it quotes, and transcripts of real calls. Those are the brief for the new agent, whatever you move to. On Bold Agent Kit, prices and hours become data points, common answers become Q&A pairs, and the decisions in the flow become written instructions. Connect a number in your own Twilio account, switch answering on, ring it yourself and compare the transcript with a Synthflow call. When it answers the way you want, point your traffic at it, and only then end the old arrangement.

Which Synthflow alternative suits an agency?

Bold Agent Kit is built to be run by agencies: unlimited agents on one plan, one per client, each with its own number, voice, knowledge base and calendar, and a client login that shows the client their one agent and nothing of your account. Your cost does not change with the number of clients, and we take no share of what you charge. My AI Front Desk runs a white-label resale programme, and Synthflow's own documentation covers agency subaccounts. Retell AI and Vapi suit agencies with developers who build custom voice agents for clients and pass usage-based costs on.

Is per-minute or flat pricing better for a voice agent?

It depends on your volume and how predictable it is. Per-minute pricing, as on Retell AI, Vapi and Bland AI, means you pay in step with usage: a quiet month costs little, a busy one costs more, and the rate often depends on the model, voice and telephony you choose. A flat price keeps the software line the same whatever happens. Bold Agent Kit charges $25 a month for the account, with nothing per minute from us; your carrier bills for the number and the minutes and your AI provider for model usage, both at cost. Compare the whole bill for your busiest month.

Can a Synthflow alternative transfer calls to my team?

Several can. Synthflow documents warm and cold call transfers, and among the alternatives, Retell AI describes agents that brief a human before connecting the caller, Bland AI prices transfers per minute on every plan, and My AI Front Desk lists call transfers to people. Bold Agent Kit cannot put a live call through to another number, and there are no human receptionists behind it. It takes the caller's name, number and reason for calling, tells them what happens next, and puts the recording and transcript in your inbox. If live transfer is a hard requirement, choose one of the others.

Other roundups

The best alternatives to the other tools people shortlist for the same jobs.

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