Bloom Cycle & Period Tracking

Bloom is a fertility and cycle tracking app built for people who are trying to conceive. Log your daily data, and Bloom turns it into actionable predictions backed by published reproductive science.

Bloom predicts ovulation and your fertile window using multiple data sources — not just calendar math. Log your basal body temperature, OPK test results, and cervical mucus observations, and Bloom refines its predictions in real time. The more you log, the smarter it gets.

Track what matters

• Period dates and flow intensity
• Basal body temperature (BBT) with thermal shift detection
• Cervical mucus type
• Ovulation predictor kit (OPK) results
• Intercourse timing
• 20+ symptoms across physical, mood, and energy categories
• Daily notes

Bloom calculates a conception score each cycle based on intercourse timing relative to ovulation, using probability data from peer-reviewed fertility research. See exactly how your timing stacks up and what you can do differently next cycle.

Bloom learns your personal luteal phase length from confirmed ovulation data and uses a weighted cycle history that prioritizes your most recent cycles. A transparent confidence score shows you how reliable your current predictions are — and what data would improve them.

Insights at a glance

• Interactive BBT chart with ovulation detection
• Cycle length trends and regularity analysis
• Cycle history with data completeness indicators
• Conception score breakdown

Your data syncs seamlessly via iCloud. Log on your iPhone in the morning and check your insights on your iPad later — everything stays up to date automatically.

Bloom reads from and writes to Apple Health, keeping your cycle data in sync with your other health apps.

Bloom stores your data on your device and in your personal iCloud account. There are no accounts to create, no servers to trust, and no data shared with third parties.