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Speechmatics vs AssemblyAI: catalog facts
Speechmatics	AssemblyAI
Best for: Developers adding speech recognition to voice agents or transcription products	Best for: Developers adding transcription or voice features to a product
Free + paid options A free start is offered, with paid usage and enterprise plans through sales.	Paid Commercial API service; see the site for current rates.
Web	Web
Real-time and batch transcription in many languages Speaker diarization and identification All 4 strengths for Speechmatics Real-time and batch transcription in many languages Speaker diarization and identification Cloud, on-premises and on-device deployment options Integrations with LiveKit, Pipecat, Vapi and Zapier	Realtime and pre-recorded transcription in 99 languages Speech understanding and dictation APIs alongside transcription All 3 strengths for AssemblyAI Realtime and pre-recorded transcription in 99 languages Speech understanding and dictation APIs alongside transcription Thorough documentation and cookbooks
Built mainly for developers working with an API On-premises and enterprise options require contacting sales	Built for developers, not a ready-made transcription app Cloud API by default
Hosted service	Hosted service
Not open source	Not open source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Sources for Speechmatics speechmatics.com Catalog checked October 2, 2026	Official website Full listing and sources Sources for AssemblyAI assemblyai.com Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.