Hey, I built Wren after being a little frustrated with everything else. I wanted something that let's me (1) enter tasks as quickly as possible, (2) let's me do it on the go, (3) can be easily backed up, (4) requires no fiddling around.

I'm super happy with how this turned out. Hopefully someone somewhere would also find this useful!

The following is straight from the README:

Wren is simple because every note is one file. The filename is the title, and the content is the note's content. This makes it very easy to sync tasks between devices, as conflicts can almost never happen, even if syncing isn't done real time. The files are plain text, so you can just write. If you want a task to repeat every Saturday you just prefix it with a cron syntax, e.g. 0 8 * * 6 weekly swim, and if you want a task to appear from a specific time you just start it with the date, like 2030-01-01 check if Wren became super popular.

Wren is advanced because it is very extensible - it comes (optionally!) with a Telegram bot that you can chat with to manage your notes, and even get AI-driven daily summaries as if you had a personal assistant. It also includes a tiny HTTP server that you can use to manage tasks using an API or from the browser, which can be used for displaying you tasks elsewhere (e.g. in your e-reader).