Everything you need.
Nothing you don't.
FlowKeeper is a full-featured cycle tracker that respects your time and your privacy. No bloat, no upsells, no data harvesting.
Log a day in seconds
Flow tracking
Mark each day as light, medium, or heavy to define your period precisely.
Mood & energy
Capture how you feel and your energy level alongside each day.
Symptoms
Track cramps, headache, bloating, acne, back pain and more across clear categories.
Pain level
Note pain on a simple 0–10 scale to spot trends over time.
Notes
Add a private note to any day for the context numbers can't capture.
Intimacy
Optionally log intimacy to keep a complete, private picture of your cycle.
Insight, not guesswork
Predictions come with a confidence level and the context to interpret them — and you choose which ones appear on your calendar: next period, fertile window, ovulation, or any combination.
Next-period prediction
An estimated start date wrapped in a likely window — never a false single day. See the math →
Ovulation & fertile window
Estimated ovulation day and the fertile window leading up to it, marked on your calendar.
Cycle statistics
Average cycle and period length, your shortest and longest, and total cycles tracked.
Symptom patterns
Spot your most common symptoms and how often they appear across cycles.
Cycle comparison
Put your current cycle side by side with the previous one to see what's changed.
Irregularity alerts
If your cycle length varies a lot, FlowKeeper flags it — a gentle cue, never a diagnosis.
Your whole cycle, color-coded
A native month view shows period, predicted period and its likely-start window, fertile window, and ovulation at a glance — and the five phases your body moves through.
Gentle, local reminders
Choose to be notified one to five days before your period, or when your fertile window opens. Everything is scheduled on-device and fires even offline.
App lock & biometrics
Lock FlowKeeper behind a passcode and Face ID / Touch ID, with an auto-lock delay you control. Your passcode is hashed and stored in the secure keychain.
One accent, light & dark
A single, carefully chosen accent runs throughout — quiet and consistent, never competing with your cycle colors. Choose light, dark, or system appearance, and switch language right inside the app.
Take it with you, or wipe it instantly
Because your data lives only on your device, you're always in control of it.
- PDF summary — a clean, doctor-friendly overview
- CSV export — your raw data, yours to keep
- CSV import — move your history to a new phone, even between iOS and Android
- One-tap delete — permanently erase everything, anytime
What FlowKeeper never does
- Upload your cycles to a server
- Require an account or email
- Show ads or sell your data
- Charge a monthly subscription
Tracking that works for you
Available on iPhone today. Coming to Android soon.