Cairn: Countdown & Days Since
Anniversary widget & reminders
$0.99 · In‑App Purchases · Designed for iPad. Not verified for macOS.
Cairn counts down to the days you're waiting for, and counts up from the days you don't want to forget.
Give it a date. It answers in days — 124 days to go, or 1,024 days since. Everything else gets out of the way.
COUNTDOWN AND COUNT-UP, ONE MODEL
• Days to go for anything ahead: a holiday, a trip, an exam, a due date
• Days since anything behind: an anniversary, a baby's birth, the day you quit
• Turn on minute precision when the hour matters — "3 days 4 hours", with seconds only in the final hour
• Repeat yearly, monthly, weekly, every N days, or by the lunar calendar
• Every event carries its own time zone, so flying across the world never shifts the number
• Count only working days when a countdown is about business days
• A date calculator for the days between two dates, or a date N days away — save the answer as an event
• Pick up dates from a screenshot, a photo or a bit of text, and start a new event already filled in
SEE WHERE IT STANDS
• A countdown bar reads like a battery gauge: solid is what's left, full to empty
• A count-up grid fills one square at a time, a day at a time
• Milestones at 100, 365, 520, 1,000 and 1,314 days, marked right on the track
• Ring, milestone track or heat grid — pick one per event, or just keep the number
• A year view lays out all twelve months at once, so you can see which one is crowded; a month view lays them out day by day
• Yearly events show which anniversary it is, and the day a countdown reaches zero gets a small celebration
REMINDERS THAT ARRIVE ON TIME
• Several reminders per event: days, weeks or months ahead, at the hour you choose
• A daily digest each morning for what's today and what's this week
• Live Activity and Dynamic Island for the last 24 hours
• Time-sensitive delivery for the dates that shouldn't wait behind a Focus
EVERYWHERE YOU LOOK
• Home Screen widgets in small, medium and large: one event, a list, or a chart
• Lock Screen widgets — inline, circular and rectangular — each pointed at the event you choose
• An Apple Watch app and complications: circular, rectangular, inline and corner
• A Control Center control for a new countdown in one tap
• Ask Siri how long until anything, or find an event right from Spotlight
• Share an event with family or friends: change the date and it changes for them too
YOURS, AND ONLY YOURS
• No account. Nothing to sign up for.
• Syncs across iPhone, iPad and Mac through your own iCloud, and mirrors to Apple Watch from your iPhone
• Import dates from Calendar and birthdays from Contacts — read only, never written back
• Export everything to a single JSON file and import it back whenever you like; local snapshots and Recently Deleted bring back what you removed by mistake
• App Lock asks for Face ID, Touch ID or your passcode when you come back
• Cover photos with automatic tinting, six muted themes, categories, pinning, archiving and a share card
• English, Simplified and Traditional Chinese, Japanese, Korean, German, Spanish, Brazilian Portuguese, French, Italian, Arabic, Persian, Hebrew and Thai — dates and month names included
Cairn is free to download and keep up to 3 events. A one-time in-app purchase unlocks unlimited events. Previous users keep full access permanently; restore with the same Apple Account. No subscription, no ads, no tracking.
A cairn is the pile of stones a trail keeps stacking to mark the way — one for every stretch you have walked.
Cairn is now free to download, with up to 3 events included and an optional one-time purchase for unlimited events. Previous users retain full access permanently and can restore it with the same Apple Account.
This update also adds more event calendars and additional interface languages, plus a new feedback page in Settings.
The developer, 飞 吕, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 飞 吕
- Size
- 17 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
English and 13 more
- English, Arabic, French, German, Hebrew, Italian, Japanese, Korean, Persian, Portuguese, Simplified Chinese, Spanish, Thai, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime Unlock $0.99
- Copyright
- © 2026 FEI LYU