Free. Private. Cycle Tracking.

Log your period, follow your symptoms, and see what repeats over time. POE brings your observations together in an encrypted journal and uses on-device, history-based estimates to help you anticipate your next period and understand your cycle.

Privacy first.

POE works offline. No account. No email address. No analytics. Not even crash tracking. The app makes no network requests and logs no IP addresses. Your journal stays encrypted on your device, with no automatic backup or sync and no POE health-data server. Enter your PIN incorrectly as little as three times, and all of your data is deleted. Enter a kill switch PIN, and all of your data is deleted.

POE Settings showing the encrypted journal and security controls.

PIN erasure protections are optional. Enable automatic erasure with a limit of 3 or 10 incorrect attempts, and set a separate kill switch PIN. Erasure removes your POE journal and its keys; saved or shared copies remain outside POE.

Read the privacy policy ↗

The daily record.

Period flow and 39 symptoms, from cramps and fatigue to sleep, mood and appetite. Browse by group, search by name, and bookmark the ones you follow. Record how strongly you felt it, or whether it was there. Add LH test results, waking temperature and cervical mucus observations to your cycle journal.

POE daily journal with period flow and symptom logging.

POE cycle observations with LH tests, waking temperature and cervical mucus.

Your cycle, in context.

Your recorded history shapes your estimates. After three eligible completed cycles, POE shows a range for your next period. LH tests and waking temperature observations add context around ovulation. Optional cycle notifications keep you informed. Every estimate and notification is calculated on your device.

POE Today screen with the cycle wheel and next-period estimate.

POE cycle history and the next-period date range.

Estimates reflect the information you log and may be unavailable when there is not enough consistent history. They are not a diagnosis, confirmation of ovulation or a method of contraception.

See what repeats.

Explore frequency and severity across three months, six months or a year. POE looks for recurring patterns in your recorded history, with the gaps still visible. A day you did not log is never counted as a day without symptoms. Every calculation happens on your device.

POE patterns showing recorded symptom frequency before a period and on other cycle days.

Patterns describe your observations. They do not diagnose a condition or establish a cause.

The vault.

Your journal is encrypted whether you add a PIN or not. An optional five-digit PIN adds a separate lock when POE moves into the background. There is no account reset, recovery key or forgotten-PIN service.

POE locked journal with a five-digit PIN entry and journal erasure control.

The kill switch.

Set a separate kill switch PIN. Enter it on the locked screen and your journal is erased. You can also choose automatic erasure after 3 or 10 consecutive incorrect PINs, or erase your journal directly from Settings. Erased means there is no recovery.

POE vault controls for the separate kill switch PIN and automatic erasure after 3 or 10 incorrect PINs.

Bring your record.

Prepare a physician export from the dates, period records and symptoms you choose. Review the PDF before sharing, add a dated appendix, or take the records as CSV. Cycle summaries and recording gaps travel with the report. You choose what leaves your device, and where it goes.

POE physician export prepared from fictional period and symptom records.

Once you save or share a file, its destination controls that copy. POE cannot recall it.

POE

Phases • Observations • Experiences

by Super Simple™

No venture capital. No private equity.
No ads. No subscriptions. Every feature is free.