LAPLACE Cycles ✽ LAPLACE

Everyone you care for, in one place

Each person’s cycle day and phase at a glance. Create a profile for a partner, a family member, or yourself.

Four people’s cycle cards on the Profiles tab

See when the next period is likely

Estimates from recent cycles, with an approximate ovulation window. When there’s little history or cycles vary, estimates fade and explain why.

How Predictions Work

Everyone’s rhythm on one calendar

Bars show each profile’s periods and estimated ovulation windows.

Calendar and Sharing

Every cycle, side by side

Compare the length of each logged cycle and period.

Cycle History

Right on your Home Screen

Widgets show each profile’s cycle day and when the next period is expected.

Widgets

On your wrist

Glance at profiles and estimates, and log or edit a period on the go.

Apple Watch

Private by design

No ads, no analytics, no account to create. Syncs only through your own iCloud, and LAPLACE never has access to your data.

Reminders, only if you want them

A heads-up 1 to 3 days before an estimated period. On the Lock Screen, names, photos and cycle details stay hidden by default.

Reminders

Copy a summary, or share it as text or an image.

Share Summary

Made for everyone

LAPLACE Cycles speaks English, Simplified Chinese and Traditional Chinese, with a language setting of its own. It supports Dynamic Type, Dark Mode, VoiceOver, Voice Control, Increase Contrast, Reduce Motion and Differentiate Without Color.

Free to start

Track up to five profiles for free. To manage more, unlock Unlimited Profiles with a single one-time purchase, with no subscription.

Requirements

iPhone

iOS 18 or later

iPad

iPadOS 18 or later

Apple Watch

watchOS 11 or later, with LAPLACE Cycles on the paired iPhone

Syncing across devices requires iCloud enabled with the same Apple Account.

Getting Started

On the Profiles tab, tap + in the top-right corner, enter a name, optionally choose a background photo, and tap Save.
Open the newly created profile, tap Log Period, select the First Day and duration, then tap Save.
The profile card will immediately display a cycle dial with the current cycle phase, day of the cycle, and next predicted period. Once two or more periods are recorded, predictions automatically adapt to real-world cycle lengths.