Comment by BLKNSLVR

I use the same application for my to-do list as I use for my "scattered everything" documentation: Noteself[0] (not affiliated, just a happy user for many years). It's a modification to TiddlyWiki that allows for the use of couchDB for essentially 'cloud hosting' (which I self-host).

I have a Calendar for appointments, which provides reminders as notifications and or email. That's outside my scope for a to-do app, although it's complementary.

I have two 'tiddlers' that open up front by default, one is the regular weekly schedule of things (with some calendar overlap) and the other is my (now very long) bullet pointed to-do list. It doesn't matter (to me) how long the to-do list is because the more important things are very near the top - merely by the passage of time if they haven't been done yet then they weren't important enough. But I keep them on the list as reminders of things I wanted to do and may still pursue at some point in the future (retirement perhaps?).

It's essentially a text file, but I can access the current version from any browser anywhere in the world (maybe not China) as long as I remember the URL, username and password. (It's more like multiple organised text files)

[0]: https://noteself.org/