Best tool for capturing ideas anytime, anywhere

I use Jota Text Editor in conjunction with Dropbox on my Android phone. This way, I can read and write using all of my devices with the contents synched to all other devices.

I used Note Everything for a long time before that but became annoyed that they don't have a built-in export capability, even in the paid version. (I found a clever hack that let me export all contents at once with minimal fixup.)

This likely works with other editors, too, but Jota handled this cleanly out of the box.

Evernote and OneNote (I'm switching from one to the other, but both are good). They both require you to have a way of cataloguing your data: YOU must have a system of doing it, and both of them will mostly comply. The better your system, the better ANY tool works for you.

Its either that, or back to paper and pen.

Simplenote,works best for me. No nonsense approach to notes. Just text, nothing else.