# AI Voice Agent Platform Comparison > Compare AI voice agent platforms on published pricing: Vapi, Retell, Synthflow, Bolna, Ringg, PolyAI and live answering services, with sources and dates. Source: https://www.centricallai.com/compare Markdown: https://www.centricallai.com/compare.md Every figure on these pages is read off the named vendor's own published pricing page and carries the date it was verified. ## All 7 comparisons - [Vapi vs Retell AI](https://www.centricallai.com/compare/vapi-vs-retell): Two developer-first voice platforms, compared on published per-minute pricing, what each figure includes, and what HIPAA costs on top. - [Synthflow alternatives](https://www.centricallai.com/compare/synthflow-alternatives): Synthflow's published pricing is now enterprise-only at a $30,000 annual minimum. What that means and where agencies priced out of it go next. - [Bolna AI pricing](https://www.centricallai.com/compare/bolna-ai-pricing): Bolna's published per-minute rates, volume tiers and bring-your-own-key model, plus where it fits and where it does not. - [Ringg AI pricing](https://www.centricallai.com/compare/ringg-ai-pricing): Ringg's published connected-minute rates in USD and INR, the add-on costs that are easy to miss, and where it fits. - [PolyAI pricing](https://www.centricallai.com/compare/polyai-pricing): PolyAI publishes no rate card. What to ask for in an enterprise quote, and how to compare it against platforms that do publish. - [White label platforms](https://www.centricallai.com/compare/white-label-voice-ai-platforms): The agency tiers compared on what they actually publish: monthly cost, included minutes, client account limits and rebilling rights. - [AI receptionist vs answering service](https://www.centricallai.com/compare/ai-receptionist-vs-answering-service): Live answering services publish rates that work out at several dollars a minute. Here is the arithmetic, and what each option actually completes. ## Frequently asked questions ### Who are the top voice AI providers in 2026? Any honest answer starts by refusing the question, because the best voice AI providers for a dealership and for a hospital group are not the same companies. What a useful voice AI solutions comparison does instead is separate the market into groups: developer platforms you build on, such as Vapi and Retell; packaged agents you configure, such as Synthflow and Bolna; and enterprise deployments quoted per client, such as PolyAI. Lists of the best voice AI companies that ignore that split are ranking products that do not compete with each other. ### How do I run an AI voice agent pricing comparison that is not misleading? Normalise before you compare. An AI voice agent cost comparison built on headline per-minute rates is close to meaningless, because some rates bundle speech recognition, the language model, text to speech and telephony, and some bundle none of them. Rebuild every quote as all-in cost per minute at the volume you actually expect, then add the platform fee and any compliance or concurrency add-ons. Do that and an AI voice platform comparison usually reorders itself completely. ### How should I shortlist the best AI voice agent providers? On completion rate rather than on voice quality, and against your own difficult calls rather than a scripted demo. Give each candidate the same five real scenarios from your call log, including one where the caller interrupts and changes their mind, and count how many end with the job actually done. Price separates the shortlist; completion decides it. ### How should I compare AI voice agent platforms? Normalise everything to all-in cost per minute at your real call volume, because published headline rates measure different things: some are platform fees with model costs on top, some are bundled. Then compare what each actually completes on the call, what compliance costs extra, and whether you can keep your configuration if you leave. ### Why do published per-minute rates differ so much? Because they include different things. A rate can cover the platform only, with speech recognition, the language model, text-to-speech and telephony billed separately, or it can bundle all of them. A five cent rate and a thirty cent rate can end up at the same real cost. ### Which voice AI platforms publish pricing openly? Vapi, Retell AI, Bland, Bolna, Ringg, Trillet, Autocalls and Vendasta all publish rate cards. Synthflow now publishes an enterprise plan only. PolyAI publishes nothing and quotes per client. Where a vendor publishes nothing, the only way to compare is to run a competitive process on identical scope. ### How much does Lindy cost, and is it a voice AI platform? Lindy publishes per-user plans at $29.99, $99.99 and $199.99 per month plus a custom enterprise tier, metered in credits rather than minutes. Its pricing page publishes no voice or phone-call rates at all, which is worth knowing before shortlisting it against a voice platform: it is a general AI assistant that can place calls, not a telephony product priced per minute. Verified August 12, 2026. ### Is a cheaper per-minute rate the right thing to optimise? Rarely, below high volume. The difference between two platforms' per-minute rates is usually smaller than the cost of the engineering time to build on them, or the revenue lost to calls the agent fails to complete. Optimise for completed calls first and cost per minute second. ### What is missing from every vendor comparison, including this one? Your own call data. Vendor comparisons cannot tell you what proportion of your calls are routine enough to automate, which is the number that decides the return. Pull a month of call logs and count them before choosing anything. ### AI voice comparison: which platform between Bland AI, Vapi, and Retell AI should I buy for my call center? All three are developer platforms you build an agent on top of, not managed products, so the question is really whether your team wants to own that build. Vapi and Retell AI are compared in detail on this site with published rates and what each figure includes; Bland AI publishes a rate card too, check it directly, we have not run the same all-in breakdown on it here. For a call center specifically, weigh concurrency, how many calls run in parallel before per-line charges kick in, alongside how much of the call flow, transfers, interruption handling, retries, you are expected to build yourself. If you want the phones answered without owning that build, a managed deployment like Centricall's is worth comparing instead of any of the three. --- Every page on https://www.centricallai.com is available as markdown at the same URL with `Accept: text/markdown`, or by appending `.md`. Site index: https://www.centricallai.com/llms.txt ยท https://www.centricallai.com/sitemap.xml