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Retell AI vs Voice Flux

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Retell AI starts at $0.07, Voice Flux at $127. Both have a free tier. Only Retell AI ships a public API.

Retell AIBuild and run AI phone agents that book, qualify and transfer calls, billed by the minute.Voice FluxVoice agent widget for websites that answers questions, books appointments, and logs every call.

Side by side

FactRetell AIVoice Flux
CategoryVoice Agents & Phone AIVoice Agents & Phone AI
Pricing modelFreemiumFreemium
Starts at$0.07 minute$127 month
Public APIYesNo
PlatformsWeb, APIWeb
CompanyRetell AI Inc.Voice Flux
Launched20232024
Last verifiedSep 6, 2026Sep 1, 2026

What our research says

Retell AI

One of the more honest voice-agent stacks: the pricing page breaks out infrastructure, TTS and LLM cost per minute so you can predict a call's cost instead of guessing. Telephony choice is wide and the concurrency allowance is generous. The catch is that per-minute billing plus add-ons makes a busy contact centre expensive fast, and the cheap end of the range only holds if you pick the cheap models.

Pros

  • Per-minute cost broken down by voice infrastructure, TTS provider and LLM on the public pricing page
  • Telephony via SIP trunking, Twilio and Vonage plus n8n, HubSpot, Make and Go High Level integrations
  • 20 concurrent calls included before any concurrency charge
  • Voice, chat and SMS agents share one platform and API
  • HIPAA path exists via a signed BAA covered in the terms of service

Cons

  • Cost per minute more than quadruples between the cheapest and most capable model combinations
  • Knowledge base, denoising, PII removal and branded caller ID are all metered extras
  • No flat-rate plan, so a spike in call volume lands straight on the invoice

Voice Flux

Voice Flux gives a small business a voice agent for its website that can answer questions, book appointments, and hand back a transcript of every call without extra tooling. It leans on third-party voice providers rather than its own stack, and the paid Managed tier carries a setup fee on top of the monthly price.

Pros

  • Free tier includes 100 real conversations a month to try the product
  • Transcribes every call into a spreadsheet automatically
  • Managed plan includes a dedicated phone number and ongoing tuning, not just self-serve setup

Cons

  • Managed plan carries a separate one-time setup fee on top of the monthly charge
  • White-label pricing is not published and requires a sales conversation
  • No public API or broad platform integration beyond a small number of website builders is documented

Which one fits

Choose Retell AI if you need

  • Teams replacing an outbound qualification or booking script
  • Contact centres that already have Twilio, Vonage or SIP trunking
  • Developers who want per-minute cost visibility before launch

Choose Voice Flux if you need

  • small businesses wanting a phone/voice FAQ agent on their site
  • teams already using Twilio, ElevenLabs, or OpenAI who want a packaged wrapper
  • businesses wanting call transcripts without extra tooling

More comparisons

All Voice Flux alternatives →Browse all Voice Agents & Phone AI →