alt Hacker NewsFUTO keyboard (open-source, free) runs entirely on-device and has extremely good STT accurary, especially with the 70M parameter model. I've used it for years now and love it.
Edit: As others have pointed out, this is not actually open source. It's source-available, which is quite a bit different because folks can't fork and distribute it as easily. The license also appears to be revocable and non-transferable, which makes it different from open source licenses.
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Futo only produces source-available proprietary software. They most certainly are not Open Source, though they unfortunately lied about this a lot before they got called out enough times.
https://github.com/futo-org/voice-input/blob/master/LICENSE....
I've used FUDO keyboard for a long time, but I never tried using the voice input, so I'm testing it now. Let's see how well it transcribes everything.
...Okay that was pretty good.
I'd classify it as "source-available" given the noncommercial clause in the license.
https://github.com/futo-org/android-keyboard/blob/master/LIC...