There are several mentions of Android on the page.

And there are clear indications at the very top of the page this is an Android project.

The GH repo listed at the has android in the name:

    OxfordHCC/tracker-control-android

and the about section subtitle is

    Download directly here, from F-Droid, or a feature-reduced version from Google Play.

It's pretty clear to me that this is an Android app.