Compare / Retell AI
Voiceflint vs Retell AI
Retell itemises well but its $0.055 infrastructure fee, $0.015 Twilio minutes and per-minute add-ons (knowledge base, denoising, guardrails, PII removal) stack up. Voiceflint itemises the same way at $0.01 with those features included.
Where Retell AI costs you
- $0.055/min infrastructure fee plus $0.015/min telephony
- Add-ons at $0.005 to $0.01 per minute each
- $8 per extra concurrent call per month above 20
- STT is auto-routed; you cannot pick the model
Where Retell AI is strong
- Mature enterprise features and SOC 2 Type II
- Batch calling and branded caller ID
- Custom LLM over WebSocket
Monthly cost, same models
Balanced stack (Deepgram Flux, GPT-5 mini, Inworld TTS-2 Flash) at $0.019/min in models; US phone calls; Retell AI numbers from https://www.retellai.com/pricing on 2026-09-08.
| Minutes / month | Voiceflint | Retell AI | Difference |
|---|---|---|---|
| 1,000 | $44 | $89 | $45 |
| 10,000 | $443 | $894 | $451 |
| 100,000 | $4,429 | $8,939 | $4,509 |
TTS $0.015-0.04/min and LLM $0.003-0.16/min added on top; KB, denoising, guardrails, PII removal are per-minute add-ons. Voiceflint: $0.010/min platform, models at list price plus a 15% managed-key fee ($0 with your keys), telephony $0.012/min.
Other comparisons: VapiBland AIElevenLabs AgentsSynthflowDeepgram Voice AgentUltravox RealtimeLiveKit Cloud (DIY)Pipecat Cloud (DIY)