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Voice Assistant HTTP gate
(lemmy.world)
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If MIT AppInventor is still kicking around, you should be able to use it for this... although sadly you won't have access to the source code since it's a Scratch-like way to create apps.
By default the Android voice assistant uses Google tech AFAIK, if you're after a truly source-available solution then there's ”Futo voice input" to handle STT, and "RHVoice" to handle TTS - though these would still need a HTTP API bridge to do what you want