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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.

The short answer

Status
Voice Flux failed our last uptime check (Oct 15, 2026); Retell AI was up on Oct 15, 2026
Entry price
Retell AI from $0.07/min, Voice Flux from $127/mo — different billing units, so no direct winner
Free plan
Both have one
Public API
Retell AI has one; not confirmed by us for Voice Flux
Higher Trust score
Retell AI — 92 vs 70 for Voice Flux

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

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/min$127/mo
Public APIYesNot confirmed
Trust score92 / 10070 / 100
PlatformsWeb, APIWeb
CompanyRetell AI Inc.Voice Flux
Launched20232024
Last verifiedOct 15, 2026Oct 15, 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

Retell AI vs Voice Flux: the questions people ask

Is Retell AI cheaper than Voice Flux?

They charge in different units, so there is no like-for-like answer: Retell AI starts at $0.07/min, Voice Flux at $127/mo. Entry price is the lowest paid plan as we last verified it.

Does Retell AI or Voice Flux have a free tier?

Both: Retell AI has a free tier, and Voice Flux has a free tier.

Which has a public API, Retell AI or Voice Flux?

Retell AI ships a public API, as of our last verification. A public API for Voice Flux is not confirmed by us — check its developer docs before you plan an integration.

More comparisons

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