Thank you for sharing this, I've made it my phone's background.
Joplin is where I landed, as well as hosting my own Joplin Server.
If Obsidian allowed a free self hosted option, I would have picked it over Joplin. (Yes, I tried the free plugin, but it at times wouldn’t sync correctly and I would end up losing notes.)
You can create Check marks by using markdown inside the note.
- [ ] TEXTHERE this should provide a blank Check Box.
- [ x ] TXETHERE this should provide a ticked Check Box.