I've previously had good luck with FUTO's keyboard and it's companion voice input app [2] on my Android, both of which are local-only after downloading the model. I'll have to try this one out and compare them.
Language support
FUTO Voice Input is currently based on the OpenAI Whisper model, and could theoretically support all of the languages that OpenAI Whisper supports. However, in practice, the smaller models tend to not perform too good with languages that had fewer training hours. To avoid presenting something worse than nothing, only languages with more than 1,000 training hours are included as options in the UI:
<List of supported languages>
Language support and accuracy may expand in the future with better optimization and fine-tuned models. Feedback is welcomed about language-related issues or general language accuracy.