Retell AI vs Synthflow: voice AI agent pricing compared
Updated 2026-11-10 · listed A to Z, not ranked
Retell AI is a platform for building AI voice and chat agents. Public pricing is usage-based (per minute / per message) with an optional Enterprise plan.
Synthflow is a voice AI agent platform for phone calls. It no longer lists self-serve plans: its pricing page describes an annual agreement sized to your call volume and setup.
Listed A to Z, from retellai.com and synthflow.ai. Every figure below is quoted from those pages.
- Main price table
- AI Voice Agents (pay as you go), AI Chat Agents, Free credits, Enterprise, Example stack total (page calculator)
- Free option
- AI Voice Agents (pay as you go): $0.07–$0.31 per minute
- Published prices
- Voice agents $0.07–$0.31/min, $10 free credits; chat from $0.002+/msg; Enterprise custom.
- Main price table
- Contract, Free plan or trial, Per-minute rate, What the agreement covers
- Free option
- Free plan or trial: None
- Published prices
- An annual enterprise agreement scoped to call volume, telephony and integrations. No free plan or per-minute rate.
How we checked: Prices quoted from each official pricing page: Retell AI checked Nov 10, 2026, Synthflow checked Nov 10, 2026. Taxes, usage overages and promotions can change what you pay; confirm with each provider before you buy.
How they compare
- Main price table. Retell AI lists 5 entries (AI Voice Agents (pay as you go), AI Chat Agents, Free credits, Enterprise, Example stack total (page calculator)); Synthflow lists 4 (Contract, Free plan or trial, Per-minute rate, What the agreement covers).
- Free option. Retell AI: AI Voice Agents (pay as you go): $0.07–$0.31 per minute. Synthflow: Free plan or trial: None.
- How prices are quoted. Retell AI: “Published entry prices”. Synthflow: “How Synthflow is priced”.
Retell AI plans and prices
| Line | Price on retellai.com/pricing |
|---|---|
| AI Voice Agents (pay as you go) | $0.07–$0.31 per minute |
| AI Chat Agents | From $0.002+ per message |
| Free credits | $10 in free credits to start |
| Enterprise | Custom pricing |
| Example stack total (page calculator) | About $0.11 per minute in one sample breakdown when we checked |
Retell Voice Infra is listed around $0.055/min with separate TTS/LLM/telephony lines on the same page (Nov 6, 2026).
From retellai.com, checked Nov 10, 2026. Full breakdown: Retell AI pricing.
Synthflow plans and prices
| Item | What the pricing page says |
|---|---|
| Contract | Annual enterprise agreement, scoped to call volume, phone system, integrations, security needs and launch support |
| Free plan or trial | None |
| Per-minute rate | None published |
| What the agreement covers | Call volume and concurrency, telephony (native or SIP), integrations, security and procurement review, support terms and launch support |
From synthflow.ai, checked Nov 10, 2026. Full breakdown: Synthflow pricing.
FAQ
How much does Retell AI cost?
Voice agents $0.07–$0.31/min, $10 free credits; chat from $0.002+/msg; Enterprise custom. (checked Nov 10, 2026).
How much does Synthflow cost?
An annual enterprise agreement scoped to call volume, telephony and integrations. No free plan or per-minute rate. (checked Nov 10, 2026).
Do Retell AI and Synthflow have a free option?
Retell AI: AI Voice Agents (pay as you go): $0.07–$0.31 per minute. Synthflow: Free plan or trial: None.
Which is better, Retell AI or Synthflow?
We do not pick a winner. The two price and package their products differently; the tables above quote each official pricing page so you can match a plan to your own usage.
Where do these prices come from?
Each vendor's own pricing page: retellai.com (checked Nov 10, 2026) and synthflow.ai (checked Nov 10, 2026). Prices change; confirm on the vendor's page before you buy.
Sources (official pages, read 2026-11-10)
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