Renard installs from the browser as a progressive web app, so it sits in your dock or taskbar and opens like a standalone app. Chrome and Edge give the best desktop install experience; everything also works in the browser tab without installing anything.
There is an Android app you can download directly. It syncs with the web version through the same account, and updates itself over the air.
There is no native iOS app yet. On iPhone and iPad you use Renard through the browser, where it can be added to the home screen.