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Tachly

Privacy policy

Last updated: 6 November 2026

1. Who we are

Tachly (tachly.app) is operated by Pascal Lanz, Bombachhalde 8, 8049 Zürich, Switzerland, who is the controller for the processing described here, except for data we process on behalf of clubs (section 3). Contact: info@tachly.app.

We apply the Swiss Federal Act on Data Protection and, where applicable, the EU GDPR.

2. What we process and why

  • Website visits: IP address, the page requested, browser and device information, to deliver and secure the website; and aggregated, cookie-free usage statistics to improve it. Legal basis: legitimate interest.
  • Contact: name, email address and message, to answer your request. Legal basis: your request and our legitimate interest.
  • Your account: email address, password (stored only as a hash), passkeys, name and the profile details you choose to enter, to sign you in, show your name to your club and send service emails. Sign-in and sign-up forms are protected against bots, which processes your IP address and browser information. Legal basis: contract and legitimate interest in security.
  • Push notifications: your browser's push subscription, only if you allow notifications. Legal basis: consent, which you can withdraw in your browser at any time.
  • Error diagnosis: technical data about errors (error details, page address, browser, IP address), and recordings of page interactions with all text and inputs masked, to find and fix problems. Legal basis: legitimate interest.
  • Change log: who changed which record and when, for traceability and security. Legal basis: legitimate interest.
  • Integrations you switch on, such as a pilot logbook service or a calendar feed: the data needed for that integration is sent where you direct it. Legal basis: contract and your instruction.

3. Data we process on behalf of clubs

Clubs and aircraft partnerships use Tachly to manage members, flights, maintenance, reservations and billing. For this data the club is the controller; we process it on the club's behalf and on its instructions. Please direct questions about it to your club first; we will support the club.

This includes the GPS track files pilots share from their navigation app. We keep each file as it was uploaded, as long as the flight it belongs to, so the times Tachly read from it can be checked later. A file can contain whatever the app writes into it, such as the pilot's name and notes; only the flight's pilot and the club's administrators can download it.

4. Service providers and transfers abroad

We use carefully selected service providers who process data on our behalf, under contract:

  • hosting and content delivery (servers in the EU);
  • database, sign-in and file storage (servers in Switzerland);
  • email delivery, document generation and error diagnosis (servers in the EU);
  • bot protection (global network);
  • website analytics (Google Analytics, Google Ireland Ltd. / Google LLC, USA);
  • map display (EU; your browser loads map images directly from the provider);
  • your browser's push service, if you enable notifications.

Some of these providers are based in the USA or Singapore and may access data from there. Such transfers rely on the Swiss-U.S. or EU-U.S. Data Privacy Framework or on the European Commission's standard contractual clauses, adapted for Switzerland. We do not sell personal data or share it for advertising. On request we will tell you which providers receive your data.

5. Cookies and storage in your browser

Inside the app we only use what the service needs or what you choose: a sign-in cookie, a cookie for your last-used club, your display settings and the app's offline cache. We do not use advertising cookies.

On the public website (the homepage, the feature pages and these legal pages) we use Google Analytics, which sets cookies (_ga, _ga_*, kept up to two years). Visitors from the EU, EEA and UK are asked first, and nothing is loaded until they accept. Visitors from elsewhere can object at any time: choose “Decline” under “Cookie settings” at the bottom of the homepage. Your choice is stored in your browser. Google's own opt-out is at tools.google.com/dlpage/gaoptout.

6. How long we keep data

We keep data only as long as needed for the purposes above: account data while your account exists, club data while the club uses Tachly, and technical, log and error data for a limited period, after which it is deleted automatically. Longer only where the law requires it.

7. Your rights

You may request access to your data, correction, deletion, restriction or a copy in a common format, object to processing based on legitimate interest, and withdraw consent at any time. Write to info@tachly.app. You may complain to the Swiss Federal Data Protection and Information Commissioner (edoeb.admin.ch) or, in the EU, to the data protection authority of your country.

8. Security and changes

We protect data with appropriate technical and organisational measures. We update this policy when our service changes; the current version is always at tachly.app/privacy.