Questions.

Yes. Kale plays the library on a Jellyfin server that you, or someone in your household, already runs. It has no content of its own.

Nothing is installed on it. Kale uses the server's own people, libraries and settings. Anything you change in Kale, like someone's limits or where you're up to, is saved on the server just as it would be from any other app.

Nothing, unless you turn on problem reports in Settings. There's no Kale account. The privacy page has the whole list, including what this website counts.

Apple TV (tvOS 26 or later), iPhone and iPad (iOS and iPadOS 18 or later).

If your household has already set up a way to reach the server from outside, Kale uses the same address. Kale runs no service of its own in between.

No. Seerr adds a household wishlist with approval; everything else works without it.

On iPhone and iPad, yes: download anything in your library, at full quality or as a smaller copy. Apple TV plays from your server.

You can set a highest rating, hide unrated titles and choose libraries for each person, and your server applies those limits in every app. They depend on the ratings your library carries, so check the titles that matter to you.

Jellyfin 10.11 and 12.1, the current release.

Kale costs nothing today.