Compare 6 text-to-speech APIs on pricing, voice quality, latency, and developer experience. Side-by-side benchmarks for building voice into your app.
Quick answer
Building voice into your product? The TTS API you choose affects cost, user experience, and integration complexity. We benchmarked 6 APIs on latency (time-to-first-byte), voice quality (MOS scores), pricing at different volumes, and developer experience. For quality, ElevenLabs and VoiceKeep lead. For price at scale, cloud providers (Google, Amazon, Azure) are cheapest. For developer experience, Resemble AI and ElevenLabs have the best docs.
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ElevenLabs' streaming API achieves sub-500ms time-to-first-byte. Google Cloud TTS and Azure are typically under 800ms. VoiceKeep API returns full audio in 2-4 seconds depending on text length. For real-time chat interfaces, ElevenLabs or Azure streaming is the best choice.
Google Cloud TTS Standard ($4/1M) and Amazon Polly Standard ($4/1M) are the cheapest for standard voices. For neural/high-quality voices, all three cloud providers charge around $16/1M. VoiceKeep Pro ($49/mo for 500K chars, ~$98/1M) and ElevenLabs Pro ($99/mo for 500K chars, ~$198/1M) include voice cloning which cloud providers don't offer.
Yes. All listed APIs work from mobile apps via HTTP requests. ElevenLabs and Google Cloud have official mobile SDKs. For offline TTS, you'll need an on-device model — none of these cloud APIs work offline.
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