know the rhythm.
show up better.
Marcy turns cycle timing into practical context—so you can notice patterns, communicate with care, and be a steadier partner. No account. No ads. Data stays on your device.
Just enter her period start date. Marcy takes it from there.
Get estimated cycle timing and daily guidance to help you know what might be coming—and show up better.
private by design
Cycle records stay on the device. Marcy has no account system, analytics, ads, or cloud database.
context, not certainty
Predictions are estimates. Marcy helps you pay attention without reducing a person to a calendar.
care in practice
Clear, grounded suggestions help turn awareness into respectful communication and useful support.
A small tool for paying better attention.
Cycles can shape timing, energy, and comfort, but they never explain a whole person. Marcy gives partners a private place to remember dates, see patterns, and approach conversations with more context.
Marcy is made by Marcy Labs LLC. Marcy is getting ready for its App Store launch. Email us if you’d like a TestFlight beta invitation. Previously used the browser prototype? Export your saved data to bring your history to the iPhone app.