Clue Period & Ovulation Tracker

Clue doesn't look like other period apps. No pink. No flowers. No "feminine energy" branding. It looks like a data tool, because that's what it is.

Free version tracks periods, ovulation, 200+ symptoms (mood, energy, sleep, pain, sex drive), and gives cycle predictions. The interface is clean, fast, and doesn't assume anything about your gender identity or relationship status. That matters to a lot of people.

Clue Plus ($39.99/yr) adds: 12-month cycle predictions in calendar view, Analysis tab with statistical breakdowns of your typical cycle, unlimited custom tags, reminders, cycle sharing with partners, pregnancy mode, wearable sync, and expert content. The analysis tab is genuinely useful for doctor visits - shows your averages, deviations, and history at a glance.

The FDA-cleared birth control feature (Clue Birth Control) uses your cycle data to identify fertile days. It's a Digital Contraceptive, not just a calendar. Worth noting that Natural Cycles was first to get FDA clearance in this space and uses temperature data for higher accuracy.

Compared to Flo (380M+ users, $49.99/yr), Clue is less content-heavy but more data-rigorous. Flo has AI health assistant and video courses. Clue has research partnerships and cleaner analytics. Flo is the mainstream pick. Clue is the scientific one.

Privacy stance is strong - they've been vocal about not selling data and have published their privacy practices. Post-Roe, this matters.

If you're TTC (trying to conceive) and want serious charting, Fertility Friend goes deeper with BBT analysis. Clue is better as a general-purpose cycle tracker that happens to also do fertility.