Fertility Friend

Fertility Friend looks like a website from 2005. It tracks like a medical device from 2025. That tension is the whole story.

The core feature is BBT (basal body temperature) charting with retrospective analysis. You take your temperature every morning before getting out of bed. FF analyzes the pattern and CONFIRMS ovulation after it happens - not just predicting based on calendar math. It cross-references with cervical mucus observations, OPK results, and 40+ other signs you can log.

This retrospective confirmation is what makes FF different from Clue or Flo, which primarily predict based on cycle history. Prediction tells you when ovulation might happen. Confirmation tells you it did happen. When you're timing intercourse for conception, that distinction matters.

Free version includes basic charting and a 30-day VIP trial. VIP ($24.99/yr renewal, $44.99/yr for new subscribers) unlocks advanced data analysis, pattern detection, pregnancy monitor, and priority support. No auto-renewal, which is oddly refreshing. You just buy the time you want.

The r/TryingForABaby subreddit treats FF as the default recommendation. The community knowledge base around reading FF charts is massive.

Available on iOS, Android, and a full web interface - the desktop version is actually the best experience for detailed charting.

Downsides: the UI is genuinely hard to navigate at first. There's a learning curve to understanding BBT charting itself. And if you're casually tracking cycles (not actively TTC), this is overkill. Use Clue instead.

For BBT tracking without the app complexity, Natural Cycles offers a cleaner experience with FDA-cleared birth control mode - but at $119.99/yr, it costs 5x more.