Buyer's guide

The 12 Best AI Voice Agent Platforms in 2026, Compared on Price, Channels and Code

By Tushar Tuteja, Co-founder and CTO, Talking Avatar Updated 11 November 2026 Prices checked 4 November 2026 15 min read

We build Talking Avatar, so our own voice agents are on this list, marked as ours. We say where other platforms fit better; see how we chose them.

The best AI voice agent platform depends on where people will talk to it and how much you want to build. For developer-built phone agents, Retell AI and Vapi are the usual self-serve starting points: both let you pick the models and the phone carrier, with free credits to start. ElevenLabs Agents lists the most languages of the platforms that publish a count (90+). Deepgram has the simplest single rate: $0.075 a minute with speech, a language model and a voice included. To own the stack, LiveKit Agents and Pipecat are open-source frameworks. PolyAI and Synthflow sell managed agents to enterprise contact centres. For conversations on a website, Talking Avatar Voice Agents put the agent on a realistic avatar for $0.06 a minute, with the realistic avatar, AI and voice all included.

voice agent platforms compared, from their own pricing pages and docs: 12
lowest published self-serve rates per minute, hosted voice agent platforms: $0.06–$0.11
rise in customer service leaders' AI spending (Gartner, August 2026): 38%
of customers say an option to reach a human is essential (Gartner): 87%

Customer service teams are spending on this. In a Gartner survey of 199 customer service leaders published in August 2026, AI spending had risen by 38% while service budgets grew just 2%. The leaders expected GenAI voicebots and no-code agent builders to be among the technologies that deliver the most value.

Key takeaways

Pick by channel first. Most platforms here are built around phone calls. If your callers are on your website, you can skip telephony costs and consider an agent with a realistic face.
The headline rate is a floor. Retell ($0.055) and Vapi ($0.05) quote a platform fee. Speech recognition, the language model, the voice and the phone line come on top. Retell's own all-in range runs $0.07 to $0.31 a minute.
Five kinds of product share one name. Developer platforms, voice-model companies' agent products, open-source frameworks, managed enterprise services and web agents with a realistic face are all called voice agent platforms. They ask very different amounts of work from you.
Compliance varies in the details. Retell, Vapi, Bland, ElevenLabs, Cartesia, Deepgram, LiveKit and Synthflow all state SOC 2 attestations and offer HIPAA options. But Vapi's HIPAA add-on costs $2,000 a month, while Retell's BAA has no extra fee.
Enterprise platforms are sold, not signed up for. Synthflow sells only annual agreements. PolyAI quotes its full platform through sales, though its model API is self-serve.

The 12 platforms at a glance

The numbers are for reference, not a ranking. Each platform is the best fit for a different job.

AI voice agent platforms compared: type, best use, channels and lowest published price
Platform	Type	Best for	Channels	Lowest published price
1. Retell AI	Developer platform	Phone agents built by developers	Phone, web widget, chat, SMS	$0.055/min platform; $0.07–0.31/min all-in
2. Vapi	Developer platform	Choosing every component yourself	Phone/SIP, web SDK, WebSocket	$0.05/min hosting; about $0.08–0.13/min all-in
3. Bland AI	Developer platform	One vendor's own models, self-hosting	Phone, SMS, web	$0.14/min (Start), telephony extra
4. ElevenLabs Agents	Voice-model company	Voice quality and languages	Phone/SIP, web, mobile, WhatsApp, SMS, email	$0.08/min, plus the LLM
5. Cartesia	Voice-model company	Code or no-code agents on fast voices	Phone (browser for testing)	$0.06/min, plus the LLM and telephony
6. Deepgram Voice Agent API	Voice-model company	One rate for speech, LLM and voice	WebSocket, browser SDK, telephony	$0.075/min all-in; $0.05 with your own LLM and voice
7. OpenAI Realtime API	Voice-model company	Your own speech-to-speech agent	WebRTC, WebSocket, SIP	$32 / $64 per 1M audio tokens in / out
8. LiveKit Agents	Open-source framework	A framework with managed hosting	WebRTC and SIP	Free framework; cloud $0.01 per agent minute over plan
9. Pipecat	Open-source framework	A vendor-neutral pipeline	WebRTC, WebSocket, telephony	Free framework; cloud from $0.01/min per agent
10. PolyAI	Managed enterprise	Enterprise contact centres	Phone, SMS, WhatsApp, chat, email	Platform by quote; model API 2 cents/min
11. Synthflow	Managed enterprise	No-code call automation at scale	Phone, chat, SMS	By quote: annual agreements only
12. Talking Avatar Voice Agents (ours)	Web agent with a realistic face	Website conversations	Web link, widget, iframe; no phone	$0.06/min, realistic avatar, AI and voice included

See an agent with a realistic face first: talk to our realistic avatar in the live demo, two minutes, free, no sign-up.

Methodology

How we chose and compared these platforms

We included a platform if you can deploy a working voice agent on it today, it publishes a price or says plainly that it sells only by quote, and it is a clear example of one of five types: developer platform, voice-model company's agent product, open-source framework, managed enterprise service, or web agent with a realistic face. We left out contact-centre suites where voice agents are one module of a larger product. We read every vendor's own pricing page, documentation and security or trust page on 4 November 2026, and quote what they publish, not what reviews say; where a vendor doesn't publish something, we say so. We haven't run paid trials of the other 11 platforms: this is a desk review of their published pricing, docs and trust pages. We build and run Talking Avatar's own voice agents, so the advice on latency, turn-taking and hand-offs comes from running one. Spotted something out of date? Open an issue on our GitHub.

About me

Tushar Tuteja

Co-founder and CTO, Talking Avatar

I'm Tushar Tuteja, co-founder and CTO of Talking Avatar. I lead the engineering behind our real-time avatar API and our no-code voice agents. We built Talking Avatar to give InterviewFlowAI's own AI interviewers a face, and we still run many of our interviews on these avatars, so the latency, session-length and concurrency trade-offs I write about are ones my team handles in production every day.

Connect with me on LinkedIn The team behind Talking Avatar

The 12 best AI voice agent platforms, compared

Developer platforms

1. Retell AI: best for phone agents built by developers

Retell AI is a voice agent platform with an API and a visual builder. It's aimed at teams building phone agents for support, scheduling and outbound calls. It charges $0.055 a minute for voice infrastructure and passes through the language model, voice and telephony you choose. Its own pricing page puts that at $0.07 to $0.31 a minute all-in.

Free to start: $10 of credits; 20 concurrent calls included, then $8 a month per extra line
Channels: Phone (Twilio, Telnyx or your own SIP trunk), web widget, chat, SMS
Compliance: SOC 2 Type 1 and 2; HIPAA with a BAA signed online at no extra fee; GDPR via a DPA (compliance docs)
Stands out for: Its own turn-taking model, which decides when the agent should stop and listen
Watch out for: The all-in cost depends on the model and voice you choose. Retell also says it doesn't run services inside the EU

2. Vapi: best for choosing every component yourself

Vapi is a developer API for orchestrating voice agents. You pick the speech recognition, language model and voice providers, or plug in your own server as the LLM. It charges $0.05 a minute for hosting. Its pricing calculator puts 1,000 minutes at about $82 to $129: $50 of hosting, $10 of speech recognition, $8–45 for the LLM and $15–24 for the voice.

Free to start: $5 of credits and 4 concurrent calls; the Core plan ($29 a month) raises that to 10
Channels: Phone and SIP, WebSocket, and a web SDK with an embeddable widget
Compliance: SOC 2 Type II, SOC 3, GDPR and PCI DSS (trust centre); HIPAA is a $2,000-a-month add-on with a BAA
Watch out for: You manage several vendors' bills and limits, and each extra concurrent line costs $10 a month

3. Bland AI: best for one vendor's own models and self-hosting

Bland AI runs its own speech recognition, language model and voice. It calls itself “the only voice AI that runs entirely on its own models”, and it offers self-hosted and on-premises deployments for sensitive workloads. The Start plan has no platform fee and bundles speech, LLM and voice into one rate.

Price: $0.14/min on Start; $0.12 on Build ($299 a month); $0.11 on Scale ($499 a month, in its billing docs); telephony extra
Channels: Phone, SMS and web, in 40+ languages
Compliance: SOC 2 Type I and II, HIPAA with a signed BAA, GDPR and ISO 27001 (pricing page)
Watch out for: A $0.015 minimum per outbound attempt or failed call on Bland's telephony, and 100 calls a day on Start

Voice-model companies' agent platforms

4. ElevenLabs Agents: best for voice quality and languages

ElevenLabs Agents (also branded ElevenAgents) is built on the company's text-to-speech voices, with a no-code builder and SDKs. It lists 90+ languages, and its channels are among the widest on this list.

Price: $0.08/min for extra minutes on every plan, plus the LLM (agents pricing); 15 free minutes a month; plans from $6 a month
Channels: Phone and SIP, one-line web widget, web and mobile SDKs, WhatsApp, SMS, email
Compliance: SOC 2 Type II, HIPAA and GDPR (agents page)
Watch out for: Calls over your plan's concurrency limit are billed at double the rate

5. Cartesia: best for code or no-code agents on fast voices

Cartesia is known for fast text-to-speech models. It sells managed voice agents, built with its Line SDK in code or its Agent Builder without code. Its per-minute rate covers the call; the language model is billed separately.

Price: $0.06/min, plus the LLM and $0.014/min for a Cartesia number (pricing); $1 of agent usage free a month
Channels: Inbound and outbound calls on a Cartesia, Twilio or SIP number. Browser calling is for testing
Compliance: SOC 2 Type II (pricing page); HIPAA, GDPR and 44 languages (agents page)
Watch out for: The headline rate doesn't include the LLM, so compare it all-in

6. Deepgram Voice Agent API: best for one rate that covers everything

Deepgram's Voice Agent API runs speech recognition, a managed language model and text-to-speech over one WebSocket connection. That makes it the simplest per-minute price on this list to forecast.

Price: $0.075/min pay-as-you-go with speech, LLM and voice; $0.05 with your own LLM and voice (pricing)
Channels: WebSocket API, browser agent SDK, inbound and outbound telephony, function calling and agent hand-offs (docs)
Compliance: SOC 2 Type 1 and 2, and GDPR with an EU endpoint; a BAA on Enterprise only (pricing page)
Watch out for: It's an API, not a builder. You write the code that connects calls and tools

7. OpenAI Realtime API: best for building your own speech-to-speech agent

OpenAI's Realtime API runs a speech-to-speech model, so one model listens and answers instead of three chained ones. It's priced in tokens, not minutes.

Price: gpt-realtime $32 / $64 per 1M audio tokens in / out; the mini model $10 / $20 (pricing)
Channels: WebRTC in the browser, WebSocket on a server, SIP for phone calls
Compliance: SOC 2 Type 2 and ISO/IEC 27001:2022 for OpenAI's platform (security and privacy)
Watch out for: No published per-minute figure. You host everything around the model, often on LiveKit or Pipecat

Open-source frameworks

8. LiveKit Agents: best for an open-source framework with managed hosting

LiveKit Agents is an open-source framework for building voice agents on LiveKit's WebRTC infrastructure (GitHub). Self-host it, or deploy it to LiveKit Cloud, which bills by the time an agent spends in a session. Avatar plugins give a LiveKit agent a face; ours, for Python (livekit-plugins-talkingavatar), costs $0.02 a minute.

Price: Framework free (Apache 2.0). LiveKit Cloud includes 1,000 agent minutes free, then $0.01 per agent session minute over paid plans (pricing); models billed on top
Channels: WebRTC, plus SIP for phone calls; Python and Node.js
Compliance: LiveKit Cloud: SOC 2 Type II; BAAs on Scale and Enterprise (security)
Watch out for: Its turn-detection models use a separate LiveKit model licence, not Apache 2.0

9. Pipecat: best for a vendor-neutral open-source pipeline

Pipecat is an open-source Python framework for real-time voice and multimodal agents. It's maintained by Daily and its community (GitHub), and works with many speech, LLM and voice providers.

Price: Framework free (BSD 2-Clause); Pipecat Cloud from $0.01 a minute per active agent, providers on top
Channels: WebRTC, WebSocket, and phone carriers such as Twilio and Telnyx
Compliance: Not stated for Pipecat Cloud
Watch out for: You assemble and operate the pipeline yourself. It's the most flexible option and the most work

Managed enterprise platforms

10. PolyAI: best for enterprise contact centres

PolyAI builds and runs customer-service voice agents for large enterprises. Its homepage names customers such as PG&E, NatWest and UniCredit. Its own model reasons over raw call audio.

Price: Full platform per minute through sales. Its Dialog-RSN-1 model API is 2 cents per connected minute plus text tokens, without telephony or orchestration (pricing)
Channels: Phone, SMS, WhatsApp, web chat, email and apps
Compliance: ISO 27001 certified (security page)
Watch out for: The managed platform is a sales-led project, not a self-serve tool

11. Synthflow: best for no-code call automation at scale

Synthflow sells no-code voice agents for call automation, built in a visual Flow Designer. Its pricing page no longer lists self-serve plans.

Price: Annual enterprise agreements scoped to your call volume; no per-minute rate, free plan or trial (pricing)
Channels: Phone, with its own in-house telephony, plus chat and SMS
Compliance: SOC 2 Type 2, ISO/IEC 27001, HIPAA and GDPR (pricing page)
Watch out for: Small teams can't try it without talking to sales

Web agents with a realistic face

12. Talking Avatar Voice Agents (ours): best for website conversations with a realistic face

Talking Avatar Voice Agents are complete no-code voice agents on a photorealistic avatar that speaks every reply with lip sync. Write a prompt, pick an avatar and one of 160 voices in 15 languages, upload documents for it to answer from (up to 10 knowledge bases), and add up to 20 tools and a post-call webhook. Then share it. See how Voice Agents work.

Price: $0.06/min, billed per second, with the realistic avatar, LLM, speech recognition and voice included; $1 of free credits
Channels: The caller's browser only: a link, a corner widget or an iframe
Limits and extras: Calls up to 60 minutes, with no limit on how many; an optional $19-a-month plan removes the "Powered by Talking Avatar" branding
Compliance: No certifications published yet
Watch out for: No phone numbers. If your callers dial in, pick one of the phone platforms above

Build one with $1 of free credits

What a minute really costs

Headline rates and all-in rates are different things, so this table shows both. Rows are sorted by headline rate.

AI voice agent platforms: headline rate, published all-in rate and what is billed on top
Platform	Headline rate per minute	Published all-in rate per minute	Billed on top, or optional
Vapi	$0.05 (hosting)	About $0.08–0.13 (its calculator)	$10 a month per extra line
Retell AI	$0.055 (infrastructure)	$0.07–0.31 (its range)	$8 a month per line over 20
Cartesia	$0.06	Not published	The LLM; $0.014/min telephony
Talking Avatar Voice Agents	$0.06	$0.06 (realistic avatar, AI and voice; web only)	Optional $19 a month to remove branding
Deepgram Voice Agent API	$0.075	$0.075 (speech, LLM, voice)	Telephony not stated
ElevenLabs Agents	$0.08	Not published	The LLM; your phone carrier
Bland AI	$0.11 (Scale) to $0.14 (Start)	Not published	Telephony; $0.015 minimum per outbound attempt

All rates are the lowest published self-serve prices, checked on 4 November 2026 on each vendor's own pricing page. The frameworks (LiveKit, Pipecat) charge about $0.01 a minute for hosting before any models. OpenAI prices in tokens, and PolyAI's model API leaves out telephony, so neither fits the table. For every line item, see our AI voice agent pricing breakdown.

Which type of platform do you need?

A developer platform (Retell, Vapi, Bland): An API that handles the real-time plumbing: streaming, turn-taking, interruptions and telephony. You write the logic and integrations. It's the usual choice for phone agents at volume.
A voice-model company's agent product (ElevenLabs, Cartesia, Deepgram, OpenAI): From a company that makes the speech models. Some add a no-code builder (ElevenLabs, Cartesia); others are APIs only (Deepgram, OpenAI).
An open-source framework (LiveKit Agents, Pipecat): The plumbing as code you run. You choose every model and own the infrastructure. It suits teams with strict data rules or unusual pipelines.
A managed enterprise service (PolyAI, Synthflow): Sold as a contract. The vendor helps build and run the agent, usually for a contact centre.
A web agent with a realistic face (Talking Avatar Voice Agents): Runs in the browser on a realistic avatar, with no phone line. The realistic avatar is included in the per-minute price.

Phone or web: where will people talk to it?

Most voice agent platforms grew out of phone automation: support lines, appointment booking and outbound dialling. If your callers dial a number, compare the phone platforms above on all-in cost per minute at your expected concurrency. New to how they work? Read what an AI voice agent is.

If the conversation happens on your website, you don't need a phone line, and you can give the agent a realistic face. That suits support, sales, onboarding, tutoring and screening interviews. Realistic avatars from other vendors cost from about $0.08 a minute (Realtime Avatar's extra minutes, on a paid plan) to $0.50 or more (Azure's real-time TTS Avatar, before Azure's own text-to-speech), checked 11 November 2026; see our avatar API pricing table. Talking Avatar Voice Agents are $0.06 with the realistic avatar included; see what each use case costs per conversation.

A realistic face adds one step to each reply. In our own production sessions in October 2026, our avatar started speaking less than 250 ms after the agent's audio reached our servers. That's the avatar's own delay, not the agent's full response time, and the network to the caller adds to it. Already run a voice agent on a platform above? You can add only the realistic face, through an avatar API.

Build a voice agent with a realistic avatar Talk to a live avatar first

How to choose an AI voice agent platform

Where do people reach it? A phone number, your website, an app, or several.
Who builds it? Developers (an API or framework) or a business team (a no-code builder).
What does a minute cost all-in? Add the platform fee, speech recognition, LLM, voice, telephony and extra concurrent lines.
How fast does it answer? People leave gaps of about 200 milliseconds between turns, according to a review of turn-taking research by Levinson and Torreira. Test response time on a real call, not a demo page.
Does it handle interruptions? Talk over it and pause mid-sentence. A good agent stops and waits.
Can it act during the call? Check that tools (look up, book, update) and post-call webhooks work with your systems.
Can it hand off to a person? In a Gartner survey of 3,566 customers published in August 2026, 87% said it is essential to have an option to reach a human agent when companies use GenAI.
Which compliance do you need? Ask for the SOC 2 report, and whether a HIPAA BAA costs extra.
How many languages? Of the platforms that publish a count, ElevenLabs lists 90+, Cartesia 44 and Bland 40+.

Frequently asked questions

What is the best AI voice agent platform?

There isn't one best platform for every job. Retell AI and Vapi are the usual self-serve starting points for developer-built phone agents. ElevenLabs Agents lists the most languages. Deepgram has the simplest all-in rate. LiveKit Agents and Pipecat are two widely used open-source frameworks. PolyAI and Synthflow serve enterprise contact centres. Talking Avatar Voice Agents suit website conversations, with a realistic avatar included in the per-minute price.

Which AI voice agent platform is the cheapest?

It depends on what the rate includes. Vapi's $0.05 and Retell's $0.055 a minute are platform fees, before the models and the phone line. For phone agents, Retell's own all-in range starts at $0.07, and Deepgram's $0.075 includes speech recognition, an LLM and a voice. For website agents with a realistic face, Talking Avatar Voice Agents cost $0.06 a minute with the realistic avatar, AI and voice included, for calls in the browser (prices checked 4 November 2026).

What is a conversational AI voice agent?

A conversational AI voice agent is software that holds a spoken, back-and-forth conversation. It listens with speech recognition, decides what to say with a language model and answers with text-to-speech. It can also act during the call through tools, such as booking a slot or looking up an order. Speech-to-speech models, such as OpenAI's Realtime API, do the listening, thinking and speaking in one model.

Can I put an AI voice agent on my website without a phone number?

Yes. Retell, Vapi and ElevenLabs offer embeddable web widgets alongside their phone features. Talking Avatar Voice Agents run only in the browser, as a link, widget or iframe, with a realistic avatar speaking each reply, for $0.06 a minute with the realistic avatar included. A web agent skips telephony and phone-number fees.

What's the difference between a voice agent platform and a framework?

A platform (Retell, Vapi, Bland) hosts the agent for you and bills per minute. A framework (LiveKit Agents, Pipecat) is open-source code you run yourself or on its maker's cloud. You choose and pay for every model separately.

Can I build an AI voice agent without code?

Yes. ElevenLabs Agents, Cartesia's Agent Builder, Retell's visual builder and Talking Avatar Voice Agents (which include a realistic avatar) let you set one up from instructions, a voice and tools. Synthflow is no-code too, but it's sold only on annual enterprise agreements.

Which voice agent platforms offer HIPAA compliance?

Retell (a BAA signed online, no extra fee), Vapi (a $2,000-a-month add-on), Bland, ElevenLabs, Cartesia, Synthflow, Deepgram (Enterprise) and LiveKit Cloud (Scale and Enterprise plans) all publish HIPAA options. Check that the BAA covers the exact product and plan you'll use.

Retell AI or Vapi?

Retell bundles more: a visual builder, its own turn-taking model, 20 free concurrent calls and a no-fee BAA. Vapi gives you more control over each component and lets you plug in your own LLM server, with HIPAA as a paid add-on. Retell's own all-in range is $0.07 to $0.31 a minute; Vapi's calculator gives about $0.08 to $0.13.

Your callers are on your website? Give your voice agent a realistic face

Build a no-code voice agent on a realistic avatar in a few minutes: $0.06 a minute with the AI, voice and avatar included, billed per second, and $1 of free credits to start.

Build a voice agent Talk to a live avatar See pricing