Retell AI vs Synthflow: 2026 comparison
Production voice agent platform — LLM-native phone agents with low-latency streaming and per-minute pricing.
Retell AI vs Synthflow — specs
| Spec | Retell AI | Synthflow |
|---|---|---|
| Agent Rank | 72 / 100 (A) | 75 / 100 (A) |
| Autonomy | Autonomous | Autonomous |
| Pricing | Pay per task · Free tier | Freemium · from $29 |
| Open source | No | No |
| Capabilities | Voice, Tool use, Memory | Voice, Tool use, Memory |
| Integrations | 3 apps | 4 apps |
| Verified | Verified | Verified |
| Released | Mar 2025 | Feb 2025 |
Agent Rank breakdown
- Autonomy fit
- 9
- Capabilities
- 6
- Integrations
- 4
- Pricing value
- 9
- Polish & maturity
- 5
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
- Autonomy fit
- 9
- Capabilities
- 6
- Integrations
- 8
- Pricing value
- 7
- Polish & maturity
- 5
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
Pros & cons
- +Lowest per-minute pricing among production voice agent platforms
- +Strong streaming latency (~300ms) competitive with ElevenLabs
- +Per-minute pricing easier to forecast than per-seat
- −Less polished out-of-the-box than Synthflow for non-technical buyers
- −Documentation and tooling still maturing vs ElevenLabs
- −Voice quality varies by model selection
- +Truly no-code — non-developers can ship a working voice agent in an afternoon
- +Templates cover most common voice-agent use cases (appointment scheduling, lead qual, surveys)
- +White-label option lets agencies resell to clients
- −No-code abstractions can hit ceilings for advanced logic
- −Voice quality slightly behind ElevenLabs-based stacks
- −Pro tier pricing is steep at $375/mo for 1,500 minutes
Pricing
- +~$0.07/min
- +Production-ready API
- +Volume discounts
- +Dedicated infrastructure
- +Custom models
- +50 minutes
- +Basic templates
- +1,500 minutes
- +CRM integrations
- +Outbound campaigns
- +3,500 minutes
- +Custom voice cloning
- +White-label option
- +Custom volumes
- +Dedicated CS
- +SSO
Which one should you pick?
Pick Synthflow if its specific capabilities (Voice, Tool use) match what you need.
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Frequently asked
Should I pick Retell AI or Synthflow in 2026?+
Pick Retell AI if cost is the main constraint. Pick Synthflow if its specific capabilities (Voice, Tool use) match what you need. Most working teams running both can use Retell AI for primary work and Synthflow for the workflows where its specific strengths matter.
What's the price difference between Retell AI and Synthflow?+
Retell AI starts at Pay per task · Free tier; Synthflow starts at Freemium · from $29. Retell AI is the cheaper entry option. For team deployments the TCO can differ — use the AI Agent Rank TCO calculator for your specific volume.
Which is more autonomous, Retell AI or Synthflow?+
Both Retell AI and Synthflow are Autonomous agents — neither has a meaningful autonomy advantage over the other. The decision should hinge on capabilities and pricing instead.