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Speaches vs Cartesia: catalog facts
Speaches	Cartesia
Free Free and open source under the MIT licence.	Paid Plans are listed on the pricing page, with a sales contact for larger deployments.
Self-hosted	Web
Drop-in replacement for OpenAI's speech and transcription endpoints Streaming transcription over SSE	One API covers text-to-speech, transcription and voice agents Built for low-latency, real-time conversation
A server with an API, not an end-user app Setup is based on Docker	Mainly an API for developers rather than a consumer app Cloud only, with no local option
Self-hosted	Hosted service
Open source	Closed source
License: MIT	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.