Clue (iOS)

“I do the same for a few other interesting companies, most notably Clue, the period and pregnancy tracking app, and Pass the Honey, the world's first (as far as I can tell!) single serving honeycomb company.”

“Lastly, I just want to give a shout out to Clue.”

“Clue is the single best software tool I can think of, tying together my messy sense of time with the realities of my physical form; and was also the thing that made me realise that what I'd worried was an ongoing glandular fever relapse was actually pre-menstrual exhaustion.”

“Clue is a good app for tracking menstrual cycles.”