What the app does and does not do
Be clear-eyed here: the Cinemana app is a general catalog with no kids mode, no PIN, and no maturity filter. Titles are listed with ratings and genres, which helps you judge, but nothing stops a curious tap. Knowing this upfront is better than discovering it later. These limits are identical in every release.
Android tools that help
Android Digital Wellbeing is your main lever. Set a daily app timer for Cinemana so it locks after the agreed screen time. On a shared family tablet, create a restricted profile or a dedicated kids space that simply does not include the app. For the living room TV, the Android TV setup keeps viewing in a shared space instead of a bedroom.
The supervision part
Tools help, but watching together helps more. Use the ratings, genre tags, and synopses on detail pages to pre-screen titles, and keep the subtitles on so you can follow along from across the room. A shared watchlist also works: let kids add titles, then you approve what actually gets played.

