> Euki is the only app Mozilla recommends without reservations. "Euki is special," Wodinsky* says.
> Unlike the other apps on this list, Mozilla says Euki keeps all your health information stored on your device, without even sending it to the company's servers.
> You don't even need to make an account, so you can stay completely anonymous. Euki also offers a "decoy" feature that shows fake, harmless information if someone gets your phone and tries to snoop.
*Shoshana Wodinsky, a privacy research analyst who tested 6 period tracker on behalf of the Mozilla Foundation