I have been using VoiceFlow. It works incredibly well and uses Groq to transcribe using the Whisper V3 Turbo model. You can also use it in an offline scenario with an on-device model, but I am mostly connected to the internet whenever I am transcribing.

Check out the FUTO keyboard or FUTO voice input apps. It only uses the whisper models though so far.

Does the Android keyboard transcription not work for your needs?

For Android I find Google GBoard transcription most accurate and pretty solid.

Not wrong, but at the same time, some people use Android and also remove Google from the equation, so finding an alternative for Gboard is valuable to them. I'm one of them and I really like Futo.

I installed Whisper+ through FDroid and it works well for my basic needs. Only 30s at a time but you can append multiple recordings to the same transcript: https://github.com/woheller69/whisperIMEplus