Flatseal allows for configuration of flatpak sandbox permissions.

Warehouse allows for managing remotes, leftover data and viewing info for installed flatpaks.

Both complement each other as they have different functionality.

From their github:

1. Viewing Flatpak Info: 📋 Warehouse can display all the information provided by the flatpak list command in a user-friendly graphical window. Each item includes a button for easy copying.

2. Managing User Data: 🗑️ Flatpaks store user data in a specific system location, often left behind when an app is uninstalled. Warehouse can uninstall an app and delete its data, delete data without uninstalling, or simply show if an app has user data.

3. Batch Actions: ⚡ Warehouse features a batch mode for swift uninstallations, user data deletions, and app ID copying in bulk.

4. Leftover Data Management: 📁 Warehouse scans the user data folder to check for installed apps associated with the data. If none are found, it can delete the data or attempt to install a matching flatpak.

5. Manage Remotes: 📦 Installed and enabled Flatpak remotes can be deleted, and new remotes can be added.