A check-in that listens.
Log energy, mood, sleep, hunger, discomfort and stress. Skip any question. Add a note, a rest day or an optional period-start date.
A private journal for energy, rest and optional overnight-window tracking. Built with women in mind, without pretending your cycle is a prescription.
Redesigned iPhone app · In pre-release testingNot currently available to download. No purchase is offered on this website.
Rest is not a broken streak.
No leaderboards. No hormone scores. No pressure to go longer.
Start with a journal, not a fasting plan. The timer is optional, and stopping early is never treated as failure.
Log energy, mood, sleep, hunger, discomfort and stress. Skip any question. Add a note, a rest day or an optional period-start date.
Protected local storage. No health-data advertising or analytics SDK. Review sensitive information before exporting it.
See days since your logged period start. No ovulation prediction, fertility claim or automatic phase-based fasting recommendation.
Eligible adults can choose an 8-, 10- or 12-hour overnight timer. These limits are not a medical endorsement. Multi-day fasting is not offered.
Fasting is not appropriate for everyone. Do not use the timer if you are under 18, pregnant or breastfeeding, have a current or past eating disorder, or have type 1 diabetes. Seek individual clinical advice for medicines affected by food, diabetes, other health conditions, being underweight or trying to conceive.
Journal-only mode stays available without fasting. Stop if you feel unwell. Fastara cannot assess your health, blood sugar or medical risk.
Read the Johns Hopkins fasting guidance. The 2022 review of human hormone trials does not validate a cycle-day algorithm for prescribing fasting hours.
No. The redesigned app records your choices and observations. It does not prescribe fasting based on sex, hormones or an estimated cycle phase.
Yes. Journal-only mode is the default. Your check-ins, rest days, optional cycle context and learning library work without a timer.
The redesigned app excludes its protected journal from device backup. You can review and export a copy you control. Deleting the app may permanently remove local entries.
Not yet. The replacement build is being tested before resubmission to Apple. A download link will appear only after availability is verified.