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Udderance AAC vs Speech Note: catalog facts
Udderance AAC	Speech Note
Free Free and open source under AGPL-3.0-or-later.	Free Free and open source under the Mozilla Public License 2.0.
Android	Linux
Provides text-to-speech communication Designed to run offline	Speech recognition, speech synthesis and translation all run offline Wide choice of engines, including Whisper, Piper and Kokoro
Android only	Linux and Sailfish OS only Models must be downloaded separately and can be large
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-or-later	License: MPL-2.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 26, 2026

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