Firefox OS is described as 'Open-source smartphone OS that uses the Open Web as a platform for mobile devices. Applications are written in HTML' and is a popular Mobile OS in the os & utilities category. There are nine alternatives to Firefox OS for a variety of platforms, including Linux, Linux Mobile, Self-Hosted, Android Auto and Android SDK apps. The best Firefox OS alternative is Android, which is both free and Open Source. Other great apps like Firefox OS are Plasma Mobile, Sailfish OS, iOS and Tizen OS.
Open-source mobile OS developed by Google, based on the Linux kernel. It supports app development in Java and Kotlin. Compatible with various devices, offering seamless integration with Google services, customizable interface, and extensive app ecosystem for smartphones and tablets.
Plasma Mobile turns your phone into a fully open hacking device, just like a PC. You can join us to start building new mobile experiences now.
Sailfish OS is a European alternative to dominating mobile operating systems, and the only mobile OS offering an exclusive licensing model for local implementations.
iOS is a mobile operating system designed by Apple for its iPhone and iPad devices. It offers a user-friendly interface, intuitive features, and seamless integration with other Apple products. With iOS, you can access a wide range of apps, games, and multimedia content, as well...
Firefox OS is focused on privacy and security. iOS is too.
This alternative is disputed. iOS is a legitimate Firefox OS alternative, but it might have issues that some users think are important.
Open source Linux-based platform designed for smartphones, tablets, netbooks, automotive infotainment, and smart TVs, offering scalable compatibility, advanced multimedia, touch support, Application Compatibility Layer for Android apps, 3D UI, and multitasking.
Also a mobile platform for designing WebApps
KaiOS brings smartphone-like functionalities to affordable phones: the KaiStore for apps. Video calls over 4G. Mobile payments through NFC. Even dual-SIM support.
Astian OS is an operating system that is based on the discontinued Firefox OS, development by Astian Foundation, thus allowing support for mobile devices, TV's, and other devices. Astian OS is completely free and open.
B2G is a community maintained open source operating system for smartphones, tablets, smart TVs and other connected devices. The project was started in 2011 and is based on the Linux kernel and Gecko rendering engine.
QtMoko is debian distribution for Linux based SmartPhones, like Openmoko Freerunner and Goldelico's GTA04 phone. Phone and user interface is based on QT Extendeded formerly known as Qtopia..
United States
Germany
EU
Finland
Chile
Czechia
If Firefox OS wasn't discontinued, I'd select it. But now the best mobile OS is Sailfish!