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AssemblyAI vs Sonix
A factual side-by-side comparison of AssemblyAI and Sonix. We compare pricing, categories, free tiers and official websites — no invented scores.
Updated 2026-10-22
Quick take
AssemblyAI is Freemium; Sonix is Paid. If you want to start free, check the free or freemium option first; otherwise compare the categories and taglines below.
Speech-to-text API with built-in summarization and insights
Speech RecognitionAI APIs
Visit websiteAutomated transcription, translation and subtitles in 40+ languages
Subtitle TranslationSpeech Recognition
Visit website| Pricing | Freemium | Paid |
|---|---|---|
| Categories | Speech Recognition / AI APIs | Subtitle Translation / Speech Recognition |
| Best for | Speech-to-text API with built-in summarization and insights | Automated transcription, translation and subtitles in 40+ languages |
| Free tier | Yes — free or freemium | No — paid only |
| Website | www.assemblyai.com | sonix.ai |