Yeah, have also been thinking how to reduce the tracking overhead. I used to use TapLog app [0] for android, it offers a widget and different kinds of trackers

Yeah, have also been thinking how to reduce the tracking overhead. I used to use TapLog app [0] for android, it offers a widget and different kinds of trackers (e.g. text/numbers/simple counters, etc), so it was relatively low overhead (although still requires fetching your phone to track). I also was thinking of using something like RFID tags, but haven't explored that yet. That would still require a phone to trigger the tag, but easier as you don't have to unlock/tap anything. Regarding your idea, I feel like if you're willing to use a raspberry PI, you could massively simplify the setup by logging into a file/sqlite database and using something like syncthing [1] to sync it with your computer. So you won't even have to cooperate with the API upfront, you could simply start tracking 'events' and decide how to interpret them later. It would be more flexible and reliable as you won't be dependent on Internet access at all. But I guess the hardest bit here is actually the hardware. [0] https://play.google.com/store/apps/details?id=com.waterbear.taglog&hl=en_GB https://play.google.com/store/apps/details?id=com.waterbear.... [1] https://syncthing.net https://syncthing.net