Indeed, the products developped by QT-cute are free.
qt-cute web applications are free Open Source sofware

Zeeland Tides (android or pwa)

Zeeland Tides applications (basic or premium version) does not collect nor transfert information from the users.

After installation, the application does not need to download data from a server and can work offline.

Each year a new version is available that includes data for current year and next year.

The App is available on www.qt-cute.org and on Google Play store.

The App (basic) show ads when online. The ads are selected by Google AdSense service.

Warning:
The accuracy of the tides can not be guaranteed. Users CAN NOT rely on this software to start any marine activity (naon, diving, infrastructure works...). The developper cannot by held responsable of any accident, damage or inconvenience caused by decisions based on this software.