How privacy friendly is Super-productivity.org?

is the webpage AND app safe to use?

the website says:

Data Privacy and Ownership

The app does NOT collect any data and there are no user accounts or registration required. It’s offline first and free and open source and it always will be.

I am also curious, but I am not an app developer so I am unable to helpfully evaluate it. Maybe putting this in as a tool suggestion to get more eyes on it?

On that note, there would also need to be a new category: “To-Do Lists”. If we keep this up by adding more categories, we should also eventually try grouping the categories by similarity/function (like the old Productivity Tools page, but this time only in the sidebar like how we do for Android recommendations).