Why people look for a Retell alternative
Retell is a capable platform - most people who search for an alternative are not fleeing a bad product, they are tired of a metered bill. The advertised rate is a base; the language model, the voice tier and telephony are counted on top, and predicting next month means modelling every meter. If you want the capability without the spreadsheet, that is exactly the gap Nixflex was built to fill.
THE 1,000-MINUTE BILL · LIVE
Nixflex — flat, all-in$80
Sources: Nixflex flat `$0.08/min. Retell advertises from `$0.07/min; a typical all-in lands around `$0.13–`$0.16/min once the model, voice and telephony are metered on top.
What you get on Nixflex
One flat price with the whole stack inside: $0.08 per minute of voice covers speech recognition, the AI, the voice, real calendar booking, the two-way SMS agent, webhooks and post-call analysis. No monthly platform fee, no per-feature meters, no gated tiers. Your own Twilio or Telnyx numbers carry the calls at carrier rates with zero markup - and they stay in your account, so there is no lock-in by design.
Underneath sits an engine that enforces the things prompts can only request: a booking cannot be confirmed unless the calendar truly accepted it, outbound voicemail is recognised by the engine itself on any carrier, and a failing custom-API tool never crashes a live call. Data lives on EU infrastructure (Ireland) with automatic 90-day deletion - a straight answer for GDPR questionnaires.
Switching, honestly: four steps
1Sign up
Free, $10 credit, no card - about 125 minutes of testing.
2Import your numbers
Your Twilio or Telnyx numbers, one API call each - no porting, they never leave your carrier account.
3Recreate your agent
Paste your prompt, pick a voice, connect your calendar and webhooks - the concepts map one-to-one.
4Test side by side
Run real calls on both platforms with the same prompt. Keep whichever wins - your numbers repoint with one webhook change.
Frequently asked
Do I have to port my phone numbers?
No - this is the key difference from most migrations. Nixflex is bring-your-own-carrier: your numbers stay in your Twilio or Telnyx account, you import them with one API call, and switching direction later is a webhook change.
Will my prompts work?
Prompts are plain instructions and transfer directly. The concepts - agents, numbers, tools, webhooks - map one-to-one, so an afternoon is usually enough for a working replica of your current agent.
Is Nixflex cheaper than Retell?
For typical usage, meaningfully: a flat $0.08/min all-in versus roughly $0.13–$0.16 once Retell’s stack is counted. What Retell has that we do not yet: SOC 2 / HIPAA paperwork - ours is on the roadmap and we say so honestly.
Can I run both platforms during the switch?
Yes, and you should: point one number at Nixflex, keep the rest where they are, and compare real calls for a week. $10 of free credit covers the pilot without a card.
Try the alternative in your browser - right now
A live Nixflex agent is on the homepage. No signup, no meeting, no card.