Sysevo

5 platforms · official sources

AI voice agent platforms compared

Voice agent platforms give you the building blocks to create AI phone agents: speech recognition, a language model, a voice and telephony. Most charge by the minute, and the headline rate often covers only part of a call. This page sets each provider's published prices, billing model and features side by side, with Sysevo for reference.

See the comparisonWhat to check

Side by side

Prices and features at a glance.

“Small team” is three people using 450 AI voice minutes a month, priced on each provider's lowest published plan that fits. A plus sign means some charges are not published.

AI voice agent platforms compared with Sysevo
PlatformStarts atHow you payAI answers callsBuilt-in CRMSmall team / month
Sysevo$29 / moFlat monthly plan with voice minutes includedIncludedFrom Connect$169 (Scale)
ElevenLabs Agents$6 / moMonthly subscription tiers that include a call-minute allowanceIncludedVia integration$0 +
Vapi$0.08 / minPer minute: $0.05/min Vapi hosting fee plus transcriber, LLM, voice and telephony provider costs at provider ratesIncludedVia integration$36.90–$58.05
Retell AI$0.07 / minPay as you go per minute (component-based, $0.07-$0.31/min for voice), plus monthly fees for numbers, extra…IncludedVia integration$31.50–$139.50 +
Bland AI$0.14 / minPer connected minute (rate depends on plan) plus transfer-time minutesIncludedVia integration$19.99 +
SynthflowBy quoteQuote: annual enterprise agreement scoped to call volume, telephony, integrations, security and launch supportIncludedVia integrationQuote

Buyer's checklist

What to check before you choose.

  1. Price the whole call

    Add the platform fee, speech-to-text, the language model, the voice and telephony. A low headline rate can double once every component is counted.

  2. Check concurrency

    Find out how many calls can run at once on each plan and what extra lines cost. Busy periods are when limits bite.

  3. Decide who builds it

    Developer platforms expect you to design prompts, tools and integrations. Count the build and maintenance time, not just usage.

  4. Know where call data goes

    Recordings, transcripts and outcomes need to reach your CRM and calendar. Check whether that is built in or depends on your own integration work.

  5. Match your compliance needs

    If you handle health, payment or regulated data, confirm the certifications and agreements on the plan you will actually buy.

The platforms

Each platform in brief.

ElevenLabs Agents

$6 / mo · Monthly subscription tiers that include a call-minute allowance

ElevenAgents is ElevenLabs' platform to configure, deploy and monitor human-sounding voice and chat agents, with no-code setup plus developer SDKs and APIs. It is billed per call minute on monthly subscription tiers, with LLM usage passed through separately.

  • Low entry price with published tiers: a free plan and paid plans from $6/mo, each with an included call-minute allowance and a flat $0.08/min for extra minutes. Source
  • Broad voice and language coverage, drawing on ElevenLabs' own TTS models; agents page cites 90+ languages and a library of thousands of voices. Source
Sysevo vs ElevenLabs AgentsElevenLabs Agents alternatives

Vapi

$0.08 / min · Per minute: $0.05/min Vapi hosting fee plus transcriber,…

Vapi is a developer platform for building voice AI agents that make and receive phone calls, handling the infrastructure while you choose the transcriber, model and voice providers. Usage is billed per minute (Vapi hosting fee plus provider costs), with optional Success Packages for support, SLAs and capacity.

  • Modular pipeline: choose and swap transcriber, LLM and voice providers, or bring your own custom models and provider keys. Source
  • Transparent usage pricing with models passed through at provider cost and a pricing calculator that breaks out hosting, transcriber, model, voice and transport. Source
Sysevo vs VapiVapi alternatives

Retell AI

$0.07 / min · Pay as you go per minute (component-based, $0.07-$0.31/min…

Retell is a platform to build, test, deploy and monitor AI voice and chat agents with telephony, prompts, tools and analytics. It is billed pay-as-you-go per minute, with the rate built from voice infrastructure, TTS, LLM and telephony components.

  • Granular, published per-component pricing (voice infra, TTS, LLM, telephony, add-ons) with no platform fee and billing to the second. Source
  • Wide model choice: many LLMs (GPT, Claude and others) and TTS providers including ElevenLabs, Cartesia, MiniMax, Fish and OpenAI, plus speech-to-speech options. Source
Sysevo vs Retell AIRetell AI alternatives

Bland AI

$0.14 / min · Per connected minute (rate depends on plan) plus transfer-time minutes

Bland is an enterprise voice AI platform for high-volume, regulated and complex phone workflows, owning its stack of telephony, speech-to-text, language model, text-to-speech and pathway orchestration. Self-serve plans charge a per-minute rate that bundles LLM, STT and TTS, with an optional monthly platform fee for lower rates and higher limits.

  • Simple bundled per-minute rate that covers LLM, STT and TTS with no per-token charges. Source
  • Owns its full voice stack (telephony, STT, LLM, TTS, orchestration); docs cite sub-400ms response latency. Source
Sysevo vs Bland AIBland AI alternatives

Synthflow

By quote · Quote: annual enterprise agreement scoped to call volume,…

Synthflow describes itself as an enterprise conversational AI platform whose voice agents work inside the phone systems and CRMs customers already use. It is sold as an annual enterprise agreement scoped to call volume, phone system, integrations, security needs and launch support.

  • Built to run inside existing phone systems: native telephony, SIP trunking, and contact-centre integrations such as Five9, RingCX and Zoom Contact Center. Source
  • Hands-on launch: forward-deployed engineers implement, test and launch agents with your team where included in the agreement. Source
Sysevo vs SynthflowSynthflow alternatives

Questions

AI voice agent platforms: common questions.

How much do AI voice agent platforms cost?

Published starting prices: ElevenLabs Agents $6 / mo; Vapi $0.08 / min; Retell AI $0.07 / min; Bland AI $0.14 / min. Synthflow prices by quote. For a three-person team using 450 AI minutes a month, the published price components run from $0 (ElevenLabs Agents) to $36.90 (Vapi), before any charges a provider does not publish. Sysevo Scale is $169 a month for the same workload, with 500 minutes included.

Which AI voice agent platforms include a built-in CRM?

None of the AI voice agent platforms compared here lists a built-in CRM on its official pages; they connect to one instead. Sysevo includes a CRM from its Connect plan ($79 a month).

Which AI voice agent platforms offer outbound AI calling?

ElevenLabs Agents, Vapi, Retell AI, Bland AI and Synthflow list outbound AI calling. Sysevo includes outbound AI calling campaigns from Connect.

Which AI voice agent platforms publish their prices?

ElevenLabs Agents, Vapi, Retell AI and Bland AI publish prices on their websites, while Synthflow asks you to request a quote. Sysevo publishes five monthly plans from $29 to $399, with 100, 250, 500, 800, 1,250 voice minutes.

Browse other categories.

AI receptionists and answering7 platforms comparedCRM and marketing platforms5 platforms comparedField service software2 platforms comparedCustomer messaging and reviews2 platforms comparedAlternatives to every platformFind options like the tool you use now

Published by Sysevo, a competing provider. Provider details come from their official pages, checked on the dates shown on each comparison. Product names and trademarks belong to their owners.

See Sysevo plans