Yes, though not a "traditional" one. I've got a voice recorder, I use it when I'm walking my dog to ramble on about whatever's on my mind. The day's events, my personal thoughts, to-do lists and notes, whatever. When I get home I dump the recording into a folder where some scripts I've written process the audio to produce a transcript (using the Whisper model from OpenAI) and then an LLM to create summaries and subject tags and so forth from it (currently Qwen3), entirely local on my computer. I've got an index for searching through them based on those AI-generated tags and summaries so I can more easily find old stuff if I need them or am curious for whatever reason.
I use entirely local AI because I am completely open and honest in there. Probably a bunch of blackmail material to be found if you dug deeply enough. I'm very careful with data security, none of this ever leaves my local systems.
I've been doing this for over ten years now, almost daily. I've always had a vague plan that someday I'd feed it all into an AI, it;s only just the past two years where that's actually started to become a reality. This weekend I'm going to experiment with upgrading my transcription AI to WhisperX, if it does a significantly better job I may have to rerun the whole dang thing through it all. Could take weeks, maybe months. I'm almost hoping it doesn't work. :)