Best Retell AI Alternatives in 2026

Short answer: pick the alternative that fixes the reason you are leaving. For more control over each provider, Vapi; for one vendor that runs its own models and builds with you, Bland AI; for the widest voice and language range, ElevenLabs Agents; for a large contact center, PolyAI or Synthflow; for calling new leads within seconds, Thoughtly; for open source, LiveKit. ThinnestAI fits if you want one agent on phone, WhatsApp and website chat, sold under your own brand if you are an agency.

All facts about other companies below come from their own websites, read on 24 October 2026.

What is Retell AI good at?

Retell calls itself an AI voice agent platform for automating phone calls. Its site describes a no-code studio with a drag-and-drop canvas and an API, knowledge bases, appointment booking, keypad navigation of other companies' phone menus, batch outbound campaigns, branded caller ID, and QA on up to all of your AI calls. Agents also run on web chat, SMS and a website widget, and connect to existing numbers over SIP trunking. Its pricing is per minute and varies with the models, voice and add-ons you choose (from its website, read 24 October 2026). Many teams have no reason to leave.

When does a Retell alternative make sense?

• Your developers want to pick and swap each speech, model and voice provider themselves.
• You want a vendor's engineers to design and launch the agent with you.
• Your main job is calling inbound leads fast, not answering a phone line.
• You want to run the stack on your own servers.
• Your customers write on WhatsApp as much as they call, or you resell agents to clients.

Retell alternatives by reason for switching

Competitor details from each company's own website, read 24 October 2026.

The alternatives in detail

1. Vapi: best for developer control

• Who it suits: engineering teams comfortable owning the agent in code.
• What it does well: you configure voice, flow, telephony and integrations; its homepage lists many model, speech and CRM integrations and contact-center connections such as Five9 and Genesys.
• Limitation: its homepage does not describe a no-code builder, and its pricing page adds provider costs to a per-minute hosting fee, which takes more forecasting.
• Source: vapi.ai, read 24 October 2026.

2. Bland AI: best for a single-vendor enterprise build

• Who it suits: insurers, healthcare providers and financial firms with high call volumes.
• What it does well: its own models end to end, 40+ languages with switching mid-call, a self-serve plan to start, and forward-deployed engineers for enterprise.
• Limitation: its site puts typical go-live for production agents at two to six weeks.
• Source: bland.ai, read 24 October 2026.

3. ElevenLabs Agents: best for voice quality across languages

• Who it suits: brands that want a distinctive voice in many markets.
• What it does well: 90+ languages, thousands of voices, and channels including telephony, web, mobile, WhatsApp and SMS.
• Limitation: paid prices were not on the agents page; enterprise is through sales.
• Source: elevenlabs.io/agents, read 24 October 2026.

4. PolyAI: best for large contact centers

• Who it suits: enterprises in hospitality, utilities, banking and retail.
• What it does well: Dialog Studio ("No-code to full code, without changing platform"), its own audio models, and channels from voice and SMS to WhatsApp, web chat and email.
• Limitation: no prices on its homepage; it is built around enterprise volumes.
• Source: poly.ai, read 24 October 2026.

5. Synthflow: best visual designer for enterprises

• Who it suits: enterprise and BPO operations teams.
• What it does well: visual flows, a multi-agent system of subflows, Auto-QA, and compatibility with Cisco, Avaya, Genesys and RingCentral systems.
• Limitation: enterprise contracts "start at $30,000 annually" on its pricing page (read 24 October 2026).
• Source: synthflow.ai, read 24 October 2026.

6. Thoughtly: best for speed to lead

• Who it suits: sales teams with more inbound leads than people to call them.
• What it does well: calls a lead about ten seconds after a form fill in its example, switches to text when the lead cannot talk, re-engages stalled leads, and logs every interaction to the CRM.
• Limitation: its homepage is about lead response; check its other pages if you need a general receptionist.
• Source: thoughtly.com, read 24 October 2026.

7. LiveKit Agents: best open-source route

• Who it suits: developers who want to host the agent themselves.
• What it does well: an open-source framework with SIP and phone numbers, on your infrastructure or LiveKit Cloud.
• Limitation: everything above the framework, from reporting to campaigns, is your build.
• Source: livekit.com, read 24 October 2026.

8. ThinnestAI: best for phone plus messaging, and for agencies

• Who it suits: businesses whose customers call and message, and agencies reselling agents.
• What it does well: the same agent on phone, WhatsApp, website chat and Telegram, matching a caller to their WhatsApp history by phone number. White label on every paid plan means your brand, your domain and your prices.
• Limitation: no drag-and-drop canvas (agents are set up in a tabbed console), no SMS, and fewer knobs for developers than Retell's API. Outside India you bring your own Twilio, Telnyx or Plivo number.

Which should you pick?

If Retell works and your only complaint is one missing feature, ask Retell first: switching costs time. If the complaint is about the model of the product itself (too much building, too little control, wrong channels), use the table above. Run the same five real calls through your top two choices and compare the transcripts, not the demos.

Next step

See the ThinnestAI vs Retell AI comparison, or, if you resell to clients, how white label for agencies works. Plans are on pricing.