Best Retell AI Alternatives & Competitors

#1 Alternative

Whisper

Free

4.85(32,000 reviews)

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OpenAI's open-source automatic speech recognition model (Large-v3 / v3-turbo, trained on 680,000 hours of audio) for multilingual transcription, translation, and timestamps across 99 languages, with native speaker diarization and streaming support.

#2 Alternative

Suno v5.5

Freemium

4.95(21,800 reviews)

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The world's leading text-to-music AI platform. Composes full, broadcast-ready songs with lifelike vocals, custom-trained voices, and personalized taste modeling in the v5.5 model.

#3 Alternative

Otter.ai

Freemium

4.81(18,500 reviews)

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AI meeting assistant with OtterPilot 3.0 (auto-joins Zoom/Meet/Teams with Visual Context capturing slides and whiteboards), Cross-Meeting Intelligence for querying your entire meeting history, and an MCP server connecting meeting data to Claude and other external tools.

#4 Alternative

Udio v4

Freemium

4.9(13,700 reviews)

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Studio-fidelity generative music workstation. Features 48kHz stereo output, full-length compositions up to 8 minutes, downloadable multi-track stems, and pristine audio mastering.

#5 Alternative

Cartesia (Sonic-3.6)

Freemium

4.94(11,400 reviews)

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Frontier streaming speech synthesis engine, now on the Sonic-3.6 model, delivering lifelike voice generation at sub-100ms time-to-first-audio across 44 languages for conversational voice agents.