Margin (留一刻) · Last updated / 最后更新：2026-11-05

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Margin helps you spot back-to-back meetings and add buffer time between them. We designed it to keep your data on your device.

What we collect

By default, Margin does not send any personal data off your device. Margin has no account system, no analytics, no advertising, and no third-party SDKs. We never collect your name, email, location, advertising identifier, or any calendar content such as meeting titles, attendees, or notes. We do not sell or share your data, and we do not use it to track you.

One optional exception (Pro, off by default). If you turn on "Keep switching when the app is closed" in Settings, Margin sends the limited information described under "Optional: keep the Live Activity updating when the app is closed" below to our relay server. Nothing is sent unless you turn this on.

What the app accesses on your device

• Calendar (full access, with your permission): to read today's events, detect back-to-back meetings, and add or remove the buffer events you ask for. Event data is processed on your device only.
• Reminders (full access, with your permission): to save the to-dos you write after a meeting, and to show them on the To-dos tab so you can complete, postpone or edit them. Margin reads the reminders it created, and — only if you turn on "Show other reminders" — your reminders that are due today or overdue. Reminders are read and updated on your device only and are never uploaded.
• Notifications (optional): local reminders near the end of a meeting and, if you turn it on (Pro), a daily to-do digest. They are scheduled on your device.
• Live Activities: the meeting countdown on the Lock Screen and Dynamic Island is generated on your device. If you turn on the optional setting described below, our relay server can also trigger the phase changes while the app is closed.

Optional: keep the Live Activity updating when the app is closed

This is a Pro feature and is off by default. When you turn on "Keep switching when the app is closed" in Settings, Margin sends the following to our relay server, which is hosted on Cloudflare and uses Apple's push notification service to reach your phone:

• an Apple push token for the Live Activity and your device's Apple push token (random identifiers issued by Apple for delivering notifications);
• a random identifier generated by the app for your installation;
• the times at which the countdown should change phase, and an opaque label for each meeting such as "k0". Meeting titles and other calendar content are never sent; titles are looked up on your device.

Our server uses this to start and update the Live Activity at the right moments, and to send a silent, content-free notification roughly every 15 minutes that briefly wakes the app so it can re-read your calendar on your device. Calendar content is read only on your device and is never uploaded.

Like any internet service, our server sees your IP address when your device connects. We do not store it ourselves or use it to identify you.