The Cycle Book

A revolutionary, must-have approach to tracking and charting your hormonal cycles—a necessary guide in the pursuit of understanding your own body Millions of people track their cycles on apps because it's a convenient way to know when your next period is likely coming. But those apps are also tracking your data, sometimes in ways that are not legal or consensual. And they don’t go deep enough. What's worse, they're also leaving users vulnerable to surprisingly inaccurate fertility predictio