# Open-source mobile operating systems

6 open-source mobile operating systems rated against public privacy criteria.

1. [GrapheneOS](https://privacyratings.com/mobile-operating-systems/grapheneos/) (our pick): B (80/100). A privacy and security focused mobile operating system with Android app compatibility, developed as a non-profit open source project for Google Pixel devices.
2. [LineageOS](https://privacyratings.com/mobile-operating-systems/lineageos/) (our pick): C (65/100). A free and open source operating system based on Android that supports many phones and tablets, including ones no longer updated by their manufacturers.
3. [CalyxOS](https://privacyratings.com/mobile-operating-systems/calyxos/): B (80/100). An open source, de-Googled Android OS with optional microG, a built-in firewall and encrypted backups.
4. [iodéOS](https://privacyratings.com/mobile-operating-systems/iodeos/): B (80/100). Android-based mobile operating system derived from LineageOS, without Google apps, with microG and a built-in blocker that filters ads and trackers across all apps.
5. [Nura](https://privacyratings.com/mobile-operating-systems/nura/): B (80/100). Linux distribution for phones and other mobile devices, formerly named postmarketOS, based on Alpine Linux and aiming to keep devices usable long after vendor support ends, with a choice of mobile interfaces.
6. [Ubuntu Touch](https://privacyratings.com/mobile-operating-systems/ubuntu-touch/): C (65/100). Mobile operating system for phones and tablets developed by the UBports community, using the Lomiri interface and running on devices originally shipped with Android.

Source: https://privacyratings.com/open-source/mobile-operating-systems/