What do you use, and how do you like it? What have you tried and didn't like?

I manage my notes/contacts/project as text file versioned with git. I'm sure I'm not the only one around here. Works great across computers, but I still haven't found an app I like for mobile.

(I'm on iOS, but Android recommendations are welcome, as they may be useful to others)

Some interesting things here: https://hn.algolia.com/?q=git+client+ios https://hn.algolia.com/?q=git+client+android (I'm refraining from summarizing results because I don't want to be flagged as promoting).