Cairn - Your Expense Tracker
Track spending in any currency
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Log a coffee in two taps. See every currency converted to your home total instantly. The travel expense tracker you'll actually keep up with — on iPhone and Apple Watch.
Cairn is the travel expense tracker built for the way you actually travel — fast enough that you'll still be logging on day five, smart enough to handle every currency without the mental math.
Most trackers fall apart on the road: the small coffee never gets logged, your tracker and your card never agree, and you give up by day three. Cairn fixes that.
LOG IN SECONDS
- A built-in numpad gets an expense in with two taps — no forms.
- Cairn suggests the category from where you are (a café becomes Coffee, a gas station becomes Fuel). Location stays on your device.
- Capture from your iPhone, Apple Watch, or a Home Screen widget.
EVERY CURRENCY, CONVERTED
- Spend in any currency; Cairn converts to your home currency automatically using live exchange rates.
- Rates are cached, so it works offline — log now, sync later.
- Free plan covers 30 currencies; Cairn Premium unlocks them all.
SEE THE REAL PICTURE
- Organize spending into trips with multiple legs for multi-country journeys.
- Set monthly budget envelopes by category and track your pace.
- Add income and watch your running balance.
- Set savings goals and let unspent budget feed them automatically.
ON YOUR WRIST
- A full Apple Watch app for logging on the move, plus complications for an at-a-glance balance.
YOURS, EVERYWHERE, PRIVATE
- Syncs across iPhone, iPad, and Apple Watch through your private iCloud — no Cairn account, no servers in the middle.
- Your location is used only on-device to suggest categories. It is never logged or sent anywhere.
- Export any trip or your whole history to CSV or JSON anytime.
Cairn Premium is available as a monthly or annual subscription, or a one-time lifetime purchase, with a free trial. Track your first trips free.
Terms of Use: https://juergen-kc.github.io/cairn-app/terms.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Juergen Klaassen, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Juergen Klaassen
- Size
- 6.4 MB
- Category
- Finance
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Cairn Premium (Lifetime) $49.99
- Cairn Premium (Annual) $19.99
- Cairn Premium (Monthly) $2.99
- Copyright
- © 2026 Klaassen Consulting
