Best Retell AI Alternatives in 2026
Retell AI is a audio tool with a freemium pricing model. The 10 alternatives below are ranked by how closely they match Retell AI's capabilities, using Vantaige's similarity engine over the full directory, with editorial score and community ratings as tie-breakers.
Bland AI is a developer platform for building AI-powered phone agents at enterprise scale. It runs a fully proprietary model stack covering STT, TTS, and telephony on flat per-minute pricing, handling up to one million concurrent calls for outbound sales and customer support automation.
LiveKit is the open-source WebRTC infrastructure and AI agent framework that powers ChatGPT's Voice Mode. Founded in 2021, it gives developers full control over real-time voice and video pipelines, from self-hosted media servers to production-ready agent orchestration.
Resemble AI is an enterprise voice platform for cloning voices, generating speech, and detecting AI-generated deepfakes. Used by Netflix, Paramount, and Deutsche Telekom. The open-source Chatterbox model hit 1 million Hugging Face downloads within weeks of release.
Vapi is an AI voice infrastructure platform for building and deploying phone agents at scale. It lets developers bring their own LLM, TTS, and telephony stack, handling real-time orchestration, turn-taking, and function calling across 100+ languages.
AssemblyAI is a speech-to-text and audio intelligence API for developers. It transcribes audio using Universal-2 and Universal-3 Pro models, adds speaker diarization, sentiment analysis, and LLM-powered summaries via LeMUR, starting at $0.15 per audio hour.
Deepgram is a developer API for speech-to-text, text-to-speech, and voice agent orchestration. Nova-3 delivers sub-300ms streaming transcription at $0.46 per audio hour, with on-premises deployment and a Voice Agent API that combines STT, TTS, and LLM routing in a single WebSocket pipeline.
Synthflow is a no-code AI voice agent platform that lets SMBs and agencies build phone call automation without writing code. Visual flow designer, ElevenLabs voice quality, 200+ integrations, and white-label reseller features for agencies.
Cartesia AI builds the Sonic text-to-speech API on a novel State Space Model architecture, hitting 90ms time-to-first-audio for real-time voice agents. Founded by the researchers behind Mamba, backed by NVIDIA and Kleiner Perkins with $122M raised.
Pipecat is an open-source Python framework by Daily for building real-time voice and multimodal AI agents. It chains STT, LLM, and TTS services into programmable pipelines with full developer control, supporting 100+ integrations including Deepgram, OpenAI, ElevenLabs, and LiveKit.
Hume AI built EVI, an empathic voice interface that reads emotion from a caller's voice and responds with matching tone and pacing. Founded by ex-Google emotion researcher Alan Cowen, it's the only commercial voice AI with bidirectional emotional intelligence built into its core architecture.
Retell AI alternatives compared
| Tool | Pricing | Rating | Best for |
|---|---|---|---|
| Bland AI | Paid | 4.1/5 (editorial) | Power users (direct replacement) |
| LiveKit | Freemium | 4.5/5 (editorial) | Trying before buying (direct replacement) |
| Resemble AI | Freemium | 4.2/5 (editorial) | Trying before buying (direct replacement) |
| Vapi | Paid | 4.3/5 (editorial) | Power users (adjacent workflow) |
| AssemblyAI | Freemium | 4.3/5 (editorial) | Trying before buying (direct replacement) |
| Deepgram | Freemium | 4.4/5 (editorial) | Trying before buying (direct replacement) |
| Synthflow | Paid | 4.0/5 (editorial) | Power users (adjacent workflow) |
| Cartesia AI | Freemium | 4.5/5 (editorial) | Trying before buying (direct replacement) |
Frequently asked questions
What is the best Retell AI alternative in 2026?
Bland AI is the closest Retell AI alternative on Vantaige, ranked by content similarity with a Vantaige score of 4.1. Bland AI is a developer platform for building AI-powered phone agents at enterprise scale. It runs a fully proprietary model stack covering STT, TTS, and telephony on flat per-minute pricing, handling up to one million concurrent calls for outbound sales and customer support automation.
Is there a free alternative to Retell AI?
Yes. LiveKit is the highest-ranked Retell AI alternative with a freemium pricing model.
What is Retell AI?
Retell AI is a Y Combinator-backed (W24) voice agent infrastructure platform for building AI-powered phone agents. Developers connect their own LLM, configure call flows, and deploy agents that handle real calls with ~600ms latency. Used by healthcare, logistics, and e-commerce companies at scale.
Is Retell AI still worth using in 2026?
Retell AI holds a Vantaige editorial score of 4.3/5. The alternatives above are for users who need a different pricing model or feature mix.