You could write stuff in a daily markdown file. This app is amazingly small and yet powerful. I keep its folder synchronized to my computer with syncthing, to

You could write stuff in a daily markdown file. This app is amazingly small and yet powerful. I keep its folder synchronized to my computer with syncthing, to be able to write there as well. https://f-droid.org/en/packages/org.billthefarmer.diary https://f-droid.org/en/packages/org.billthefarmer.diary This one lets you track simple things about your day, like whether you did something or not. It doesn't get any simpler. Just one tap/tick. Makes nice plots of the data. https://f-droid.org/en/packages/de.smasi.tickmate/ https://f-droid.org/en/packages/de.smasi.tickmate/ This one is similar but can do a bit more. It can record time spans of activities and more. Also does plots. https://f-droid.org/en/packages/com.samco.trackandgraph https://f-droid.org/en/packages/com.samco.trackandgraph