On iOS even Todotxt-apps cannot really be used because they sync with Dropbox. That is part of privacy shield. But that is still kind of risky.

By nielsk

I am a sysadmin with a background in Japanese Science and economics. Thus my topics are computers, Japan and economics. My favorite past times are pen&paper-role playing games and old video games.

With a couple of friends I also podcast about retro video games in German: Retrozirkel