iOS app · own product
ContoTrip – travel spending under control
Log expenses, convert automatically, keep an eye on the budget – no account needed. If users want, the AI reads their receipts using their own API key.
The project
From idea to app
Starting point
Travelling means spending in several currencies, and at the end you want to know what the trip cost in your own currency. Many apps for this require an account or store the data on someone else’s servers.
Solution
ContoTrip is a native iOS app with no account, no ads and no server of our own. Every expense carries its own currency. The rate is frozen at capture time so totals stay stable; older receipts use the historical rate of the receipt date. On top come a budget per trip, totals by category, a currency converter and CSV export.
AI with your own key
With ContoTrip Pro the AI reads receipts: merchant, amount, date, currency and category arrive pre-filled in the form. Users choose OpenAI, Google Gemini or Anthropic and add their own API key. The receipt image goes straight from the device to the provider.
Technology and status
- Swift 6, SwiftUI and SwiftData, synchronised through CloudKit in the private iCloud
- StoreKit for the one-time Pro purchase, no subscription
- App languages German and English, plus an early prototype in React Native
- The website contotrip.com is online; the app has been submitted to the App Store and is in review.
Screens
What ContoTrip looks like
In numbers
ContoTrip at a glance
- AI providers to choose from
- 3
- app languages
- 2
- trips in the free version
- 2
- servers of ours holding your data
Technology
What ContoTrip is built with
Apple’s own frameworks for interface, data, sync and purchases – plus three interchangeable AI providers.
- Swift 6
- SwiftUI
- SwiftData
- CloudKit
- StoreKit
- Gemini · OpenAI · Claude