Louis Rossman had Futo created, which is a privacy aware voice keyboard input device tool for android.

https://futo.org/

I'm not quite sure on other apps as i don't usually look/go for these tools.

Is this of use to you https://github.com/abb128/LiveCaptions ?

Didn't try it myself due to time constraints, but want to, since it seems quite nice.

The release is source code. When it isn't trivial to compile i find it a pain to try for source code.

Hmm. Speech to text is tricky. But possible.

You could do some piping or output routing; for example Pocketsphynx > some kind of program to display text on an OSD...



(Other programs exist, such as Julius), or you could use a notification daemon to pipe the text to a notification caption...

Thanks for the answers everyone.
Surprisingly, Pitney_b answer was exactly what I was looking for because I was also using Kdenlive to try to add subtitles automatically.

The setup is quite automatic and you can use VOSK Python script inside Kdenlive or let it auto download dependencies and install language models.

The only thing that can be considered annoying is that apparently it uses some OpenAI models (?) for speech-to-text?
(Need to confirm that.)
So be warned if you want to try that and are against OpenAI.