The best alternatives to Retell AI in 2026
Last updated: November 9, 2026. This is independent research based on vendors' published pricing and documentation, read on November 9, 2026. We did not test these products. See the full ranked list.
Answer in brief
Retell AI is our #1 overall AI phone agent. But if your per-minute costs swing too much with model and add-on choices, or you want someone else to build the agent, these are the strongest alternatives. Vapi gives you the most control over each component. Bland AI has one bundled rate and claims latency under 400 ms. Synthflow offers managed enterprise rollouts. PolyAI is built for large contact centers and bills per second. Phonely is a ready-made agent running on its own phone-call model.
Top Retell AI alternative: Vapi. $0.05/min hosting, models at cost with no markup, 15 voice providers, and free Vapi SIP, WebSocket and WebRTC transport.
Why teams look past Retell AI
- The real per-minute rate depends on the LLM and voice you choose ($0.07–$0.31/min), and add-ons such as a knowledge base, denoising, PII removal and AI QA are billed on top.
- It takes some technical setup, and Enterprise pricing isn't published.
- Some buyers want one bundled number, or a vendor that builds and runs the agent for them.
Retell AI alternatives compared
| Alternative | Best for | Published pricing | Phone and voice standout |
|---|---|---|---|
| Vapi | Engineering teams | $0.05/min hosting plus provider costs; about $82–$129 per 1,000 min (Vapi estimate) | 15 TTS providers; Twilio, Telnyx, Vonage and SIP |
| Bland AI | One rate, regulated teams | $0.14/min (Start); $0.12/min plus $299/month (Build) | Claimed latency under 400 ms; owns its voice stack; 99.9% uptime SLA on all plans |
| Synthflow | Mid-market and enterprise rollouts | Annual enterprise contract only | Native telephony, SIP or approved enterprise telephony; Zoom and Five9 integrations |
| PolyAI | Large contact centers | Custom per-minute platform price | Per-second billing; your carrier over SIP at no charge; real-time latency monitoring |
| Phonely | Ready-made agent, inbound and outbound | $50/month or $33/month billed annually; Enterprise from 5¢/min | Own Alma model; 1,000+ voices; unlimited concurrent calls |
1. Vapi: the most control over your voice stack
Vapi lets you choose the transcriber, model, voice and carrier separately, and bills each at provider cost. Telephony is free on Vapi SIP, and Twilio costs $0.008/min inbound and $0.014/min outbound. The trade-off: 4 free concurrent calls (Retell gives 20), HIPAA as a $2,000/month add-on, and Vapi's advertised typical latency of about 800 ms. Full Retell AI vs Vapi comparison · Vapi review ·
2. Bland AI: one number for the whole call
Bland's rate includes the LLM, speech-to-text and text-to-speech, with no token charges. You bring your own Twilio account or SIP trunk, or use Bland's Twilio at pass-through cost, and bring-your-own-telephony customers pay no transfer fees. Watch the Start plan's limits: 100 calls/day, 10 concurrent calls and 1 voice. Retell AI vs Bland AI · Bland AI review ·
3. Synthflow: managed rollouts at enterprise scale
Synthflow sells annual enterprise agreements that scope concurrency, telephony, integrations, security review and, where included, launch by forward-deployed engineers. Synthflow says it powers 1M+ calls daily in 30+ countries. Batteries Plus runs Synthflow agents inside Zoom Phone across 700+ U.S. locations. There's no free plan, trial or per-minute rate. Synthflow review ·
4. PolyAI: built for the contact center
PolyAI's platform is priced per minute through sales. That price includes performance improvements, maintenance and 24/7 support, billed on connected time per second with no minimums. Your own carrier connects over SIP at no charge, and voice, chat and messaging share the same agents. PolyAI also offers a separate model-only API, Dialog-RSN-1, for teams that already have a voice stack. PolyAI review ·
5. Phonely: a ready-made agent on its own phone model
Phonely says its Alma model reaches the first token in 182 ms, against 490 ms for GPT-4.1 (Phonely's figure). Every plan has unlimited concurrent calls, and Starter includes 3 free numbers. SIP trunking and a HIPAA BAA are on Enterprise, from 5¢/min. Its pricing page lists different included minutes in different places, so confirm in your account before buying. Phonely review ·
When to stay with Retell AI
Stay with Retell if you want 20 free concurrent calls, per-second billing, about 600 ms of advertised latency and free bring-your-own SIP, all without a contract. Retell AI review ·
FAQ
What is the cheapest Retell AI alternative?
For developers, Vapi estimates $82–$129 for 1,000 minutes with its default providers. For a ready-made agent, Phonely starts at $33/month billed annually.
Which Retell AI alternative has the lowest latency?
Bland AI claims under 400 ms and Phonely cites a 182 ms time to first token for its Alma model. These are vendor claims measured in different ways, so test them yourself.
Is there a Retell AI alternative with managed setup?
Yes. Synthflow and PolyAI both offer vendor-led enterprise deployments, and Phonely Enterprise includes a full agent buildout.
Keep comparing
Ranked list · Vapi vs Bland AI · How to choose · Pricing comparison. For agent platforms beyond voice, see bestenterpriseagentplatforms.com.
Sources
- Retell AI pricing
- Vapi pricing
- Vapi FAQ
- Bland AI pricing
- Synthflow pricing
- PolyAI pricing
- Phonely pricing
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