MIT SLS

by MIT CSAIL

MIT Spoken Language Systems Group — TIMIT + Galaxy + Jupiter origins.

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TL;DR

Best for spoken dialogue systems; conversational ASR; speech understanding. Pricing: free.

What it is

MIT SLS co-created TIMIT and ran the Galaxy / Jupiter / Mercury dialogue systems in the 1990s — early conversational AI. Active in low-resource speech today.

Best for: Spoken dialogue systems; conversational ASR; speech understanding.
Watch out for: Academic.

Install / use

Go to MIT SLS groups.csail.mit.edu

Features

Speaker diarization	No
Word-level timestamps	No
Streaming / real-time	No
Languages supported	0
HIPAA eligible	No

MIT SLS vs Whipscribe

Feature	MIT SLS	Whipscribe
Category	Open source	Transcription APIs
Pricing	free	$4–$24 one-time packs (credits never expire) · $2 single unlock · 60 min free on signup
Speaker diarization	No	Yes
Word timestamps	No	Yes
Streaming	No	No
Languages	0	99
Platforms	Web	Web, API, MCP

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