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Travel tools · Android · Web · iPhone
Curves&Cash
Travel together. Split costs fairly.
Plan trips, record experiences and share expenses clearly. A motorcycle in the logo - for everyone travelling together.
Android users install the official app securely from Google Play. The web version is available for iPhone, iPad and browsers.
A look inside the app
From planning a trip to settling shared costs: keep your journey and travel budget in view.
Your trips at a glance
See travel dates and participants, then open the trip you need.
Create a new trip
Set the title, dates, description and default currency for a trip.
Plan routes and stages
Record stages and stops with dates, transport and times.
Record accommodation
Manage accommodation, booking status, dates and occupancy.
Track shared expenses
Record amounts, who paid and how each expense is shared.
Settle costs fairly
Review personal shares, balances and suggested settlement payments.
Screenshots show the German Android version with example records and obscured names. Appearance and available features may differ in the web version. Select an image to enlarge it.
Privacy by principle
Your data. Your device. Your control.
Curves&Cash is deliberately data-minimising. It requires no registration, user account or central cloud storage. Your trips, participants, expenses and receipts remain locally on your device.
The trip-management features do not transmit trip data to rainbow-data. External services opened voluntarily, such as Google Play or Wero, are governed by their own privacy policies.
Stored locally
Trips, settlements and receipts are stored only on the device you use.
No ads or tracking
No advertising networks, analytics profiles or hidden usage monitoring.
Backups under your control
Backup files are created only when requested and saved to a location you choose.
A conscious choice
Why is there no connected version?
Many apps store all information on central servers and require a user account. Curves&Cash deliberately takes a different approach: your trips, fellow travellers, expenses, receipts and settlements remain on your device.
Independent while travelling
The app works without an internet connection – on the road, abroad or where mobile coverage is poor.
Less attack surface
Data that is not stored on a central server cannot be exposed there by an attack or compromised account.
Simple and reliable
No login, no synchronisation conflicts and no dependence on a permanently available online service.
You decide what to share
Invitations and backup files are shared only when you explicitly choose to do so.
Good to know:
Changes are not synchronised automatically between devices. When changing devices or moving between the Android and web versions, you transfer your data using backup and restore.
Not using a cloud is not a missing feature. It is a deliberate choice in favour of data minimisation, independence and a lean app.
What it does
A focused travel app for shared expenses
The app deliberately focuses on the essentials: create a trip, add participants, record stops and accommodation, assign expenses and produce a clear settlement.
Organise the trip
Keep trip details, participants, route, stops and accommodation together.
Record expenses
Assign payments to the right people and account for different cost shares.
Check the settlement
Review the results and share the trip summary as a PDF.
Use it in three languages
The interface is available in German, English and French.
Two ways to use the app
Choose the right version
On Android, Curves&Cash is installed from Google Play and receives automatic updates.
On iPhone and iPad, the web version can be added to the Home Screen from Safari and used like an app.
- 1Android: use Google Play
Install the official Android app directly from the Google Play Store.
- 2iPhone or iPad: open the web app
Open the web version in Safari and optionally add it to your Home Screen.
- 3Back up your data
Trips are stored locally on your device. Create a backup before changing devices or app versions.
- 4Feedback is welcome
You can continue to send bugs, ideas and suggestions through the feedback form.
Everything at hand
App, web version and manuals
Curves&Cash
Official Android app on Google Play
Web version for iPhone and browsers
For iPhone, iPad and browsers · installable · works offline
Benutzerhandbuch
Deutsch · PDF
User Manual
English · PDF
Manuel utilisateur
Français · PDF
For iPhone and iPad
Install the web version on iPhone
The web version works like a small app on iPhone. It is not downloaded from the App Store; instead, you add it to the Home Screen using Safari.
- Open the web version in Safari
Open mobileapps.rainbow-data.de/kurven-kroeten-web/ directly in Safari. If the link first opens inside WhatsApp or another in-app browser, choose “Open in Safari”.
- Let it load completely once
Allow the start page to load completely while connected to the internet. This lets the files needed for later offline use be stored.
- Open the Share menu
In Safari, tap the Share button – the square with the upward arrow. Depending on your Safari layout, it may be at the bottom or inside the menu.
- Add it to the Home Screen
Scroll down and tap “Add to Home Screen”. If shown, leave “Open as Web App” enabled. Then tap “Add”.
- Start it from the new icon
A Curves&Cash icon now appears on the Home Screen. From now on, start the web version using this icon, just like a regular app.
- Briefly test offline mode
Open the web app online once. You can then enable Airplane Mode and launch it again from the icon to test offline use.
Offline use: After the first complete online visit, the core functions are available without an internet connection. A connection will be needed again when the web app is updated.
Important information about your data: Trips and settlements remain stored locally on this iPhone and are not automatically synchronised with other devices. Clearing website data may also remove stored trip data, so export or back up anything important.
Important note for previous beta testers
Move safely from the beta to Google Play
The former directly installed APK and the Play Store app use different signatures. The beta must therefore be uninstalled before installing from Google Play. Back up your trips first.
Back up first, then uninstall
Uninstalling the beta deletes its locally stored trips. Continue only after the backup file has been saved successfully outside the app.
- Create a backup
In the beta, open “Info → Backup → Create backup” and save the backup file outside the app.
- Uninstall the beta
Uninstall the directly installed APK only after the backup has been created successfully.
- Install from Google Play
Install Curves&Cash from Google Play. Future updates will then arrive automatically through the store.
- Restore the backup
In the new app, open “Info → Backup” and restore the backup you saved.
If you did not save any trips in the beta, you can uninstall it and install the Play Store app directly.
Found it? Thought of it? Missing it?
Send feedback or report a problem
Tell us in your own words what you noticed. One sentence is enough; technical details are optional.
Ideas and usability suggestions are welcome too.
- Up to 3 attachments
- JPG, PNG, PDF, TXT or LOG
- Maximum 5 MB per file, 10 MB in total
- No permanent storage on the web server