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Vapi 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. Vapi starts at $0.05, Voice Flux at $127. Only Voice Flux has a free tier. Only Vapi ships a public API.

VapiDeveloper platform for building and running voice phone agents, billed per minute of call time.Voice FluxVoice agent widget for websites that answers questions, books appointments, and logs every call.

Side by side

FactVapiVoice Flux
CategoryVoice Agents & Phone AIVoice Agents & Phone AI
Pricing modelPaidFreemium
Starts at$0.05 minute$127 month
Public APIYesNo
PlatformsWeb, APIWeb
CompanyVapi Inc.Voice Flux
Launched20202024
Last verifiedSep 6, 2026Sep 1, 2026

What our research says

Vapi

The default answer when a developer needs a voice agent on a phone line rather than a chat widget: it handles the hard real-time parts — barge-in, latency, turn-taking, telephony — and lets you swap in your own models. Enterprise adoption at Ring and Intuit is real validation. Cost forecasting is the hard part, because the platform fee is only one of four meters running.

Pros

  • Handles real-time voice mechanics: turn-taking, interruptions, latency and telephony
  • Bring-your-own-key support across OpenAI, Anthropic and Google avoids double model markup
  • CRM and helpdesk integrations for Salesforce, HubSpot and Zendesk
  • SOC 2, HIPAA and PCI compliance plus SSO and RBAC on the enterprise tier
  • Proven at scale, with Amazon Ring routing inbound support volume through it

Cons

  • The $0.05/minute platform fee sits on top of speech, model and voice provider costs
  • Concurrency beyond ten lines costs $10 per line per month
  • Enterprise compliance features require an annual Scale contract
  • It is a developer platform, so there is no usable no-code path

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 Vapi if you need

  • Developers building phone-based support, booking or qualification agents
  • Replacing IVR trees with something that actually listens
  • Teams that want to bring their own model and voice provider keys

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 →