I would pay for an app that did this offline but that is my biggest sticking point as well.

This kind of thing only really works if you are completely uninhibited and I'm not stupid enough to make that information pseudo-public, even with promises from seemingly trustworthy people.

So I just use my org-mode setup and have to write the little reminders/stats bits myself, which means I don't get around to it, but do have a file with all the ideas for them marked TODO.