Clue

Period and cycle tracking with science based insights

Clue is a polished, research-driven period and cycle tracker that goes far beyond marking dates on a calendar. It’s designed for anyone who menstruates, covering everything from first period through fertility, pregnancy, and perimenopause in one coherent experience.

The app’s biggest strength is how customizable its tracking is. You can log over 200 data points, including bleeding, pain, mood, sleep, sex drive, energy levels, and more. Over time, Clue’s algorithm learns from your entries and offers increasingly accurate predictions for period start, PMS, and ovulation. The predictions feel grounded in data rather than guesswork, which makes planning around your cycle noticeably easier.

Clue’s interface is clean and uncluttered, with clear color-coding and intuitive icons. The Cycle View, calendar, and detailed charts help you spot patterns at a glance, whether you’re trying to understand recurring cramps, mood dips, or fertile windows. The app also includes concise, science-based articles that explain what’s happening in your body in straightforward language, avoiding myths and fearmongering.

For those with specific goals, Clue can be tailored: you can focus on simple period tracking, fertility awareness when trying to conceive, pregnancy tracking, or monitoring symptoms during perimenopause. This flexibility makes it feel more like a long-term health companion than a single-purpose tracker.

There are downsides. The sheer number of tracking options can feel overwhelming at first, and some of the deeper insights and specialized modes sit behind a paid subscription. Users with very irregular cycles may still find predictions less reliable, which is a limitation of the data rather than the design.

Overall, Clue stands out as a thoughtful, inclusive, and science-led tool for understanding your menstrual health, offering both everyday practicality and genuinely useful insight into how your cycle affects your life.