Maybe SeeNote [1] could be what you are looking for. Only preorder now, but looks really nice. I would really like give it a go, but I don't like preorders. [1] https://www.getseenote.com
The reason is because I feel like SeeNote is overkill, like they took the elegant idea of modernizing the sticky note and added things like weather and prompts for no apparent reason.
If I could build a stripped-down version of this myself, that would be ideal. I just don't have any clue where to start.