Not exactly “Self hosted” But on Android i am using Track & Graph: f-droid.org/packages/com.samco.trackandgraph/

This kinda cobined with Obsidian.md as my diary.

Next step for me is to Set an Auto Reminder via Tasker.

Since i can make Backups for bith which automatically upload to my Servers its the closest Thing i can reccomend as “selfhosted”