Tandem Currency – Privacy Policy

Last updated: 13 October 2026

Tandem Currency is provided by Digitalhope Ltd. This policy explains how the app handles information and how to contact us about privacy. For help using the app, visit Tandem Currency support.

Information stored on your device

Tandem does not require an account. Your currency preferences, saved conversions, trip budget and expense entries are stored in the app on your device. Expense entries can include a note, an amount, a currency, the converted home-currency amount and relevant dates. Exchange rates and history are also saved so previously fetched information can be used offline.

The app does not send your entered amounts, expense notes, saved conversions or budget to DigitalHope. It does not include advertising, tracking or analytics software.

Exchange-rate requests

Tandem requests daily reference rates from Frankfurter at api.frankfurter.dev. These requests contain currency codes and, for historical data, a date range. They do not contain your amount, travel notes, budget or an app-assigned user identifier.

Like any internet connection, a request must reach the service through your network. Frankfurter states that it does not collect or log personal data, IP addresses or request URLs, and that its infrastructure provides aggregate traffic statistics. You can read its current service information at frankfurter.dev.

Apple Intelligence, Siri and sharing

When available, Ask Tandem uses Apple’s on-device Foundation Models framework to interpret currency names. That request is processed on your device. Tandem does not send it to DigitalHope or an external AI service. The app validates the interpretation and asks you to check the amount and currencies before applying it. AI does not provide exchange rates or calculate your result.

Siri and Shortcuts are Apple system features. Their availability and handling of interactions depend on your Apple settings and Apple’s privacy practices. Tandem’s conversion action receives the parameters supplied to it and returns the conversion and reference date. It does not create a DigitalHope account or upload your conversion history.

If you choose to share a conversion, the system share sheet passes the selected conversion text to the destination you choose. That destination handles the shared information under its own privacy practices.

Storage, backups and removal

Saved entries stay in the app until you remove them or remove the app’s local data. You can delete individual expenses and saved conversions from their respective screens. Removing the app removes its local app storage. Device or iCloud backups may contain a copy according to your iOS backup settings; backup management and restoration are controlled by iOS and your Apple account. DigitalHope cannot read or remotely delete those backups.

Cached rates can be replaced when new data is fetched. We do not operate a server copy of your app notebook.

Contacting support and visiting our website

If you email support@digitalhopeltd.com, we receive the information you choose to send, such as your email address, message and attachments. We use that correspondence to answer your request and resolve the issue. It is separate from the information stored inside Tandem. Please avoid sending payment-card details, bank credentials or other information unnecessary for support.

This support website is separate from the app and is served by Google Firebase Hosting. Visiting it sends connection information, including your IP address, to the hosting service. Google states that Firebase Hosting uses IP addresses for abuse prevention and usage analysis and retains that IP data for a few months. See Firebase’s privacy information.

The website remembers your chosen motion and screenshot appearance settings in your browser’s local storage. You can remove those preferences by clearing this site’s browser data. Visiting these pages does not send your Tandem notebook to us or to the website host.

Price and pre-release versions

Tandem Currency is free at launch and has no subscriptions or in-app purchases. Apple handles distribution through the App Store under its own privacy practices.

If you use a pre-release version through TestFlight, Apple may provide us with crash information and feedback or screenshots you choose to submit. We use this information to investigate problems and improve the app.

Questions and changes

For a privacy question or a request about information you have sent directly to us, contact support@digitalhopeltd.com. We may update this policy when the app or our practices change and will update the date above.