This post was written by voice input through the #Futo keyboard which uses #whisper. Free, open source and local - no internet connection! Seems to work very well for English and quite good for German too. I only had to add hashtags and correct two words manually.
Important addition: I was motivated to look for a solution for a friend who has multiple sclerosis, and it makes typing really hard for him. His messages are already longer and more detailed :)