List of Mobile Operating Systems
| S. No. | Operating System | Developer / Origin | Category / Features / Status |
| 1 | Android | Google / Open Handset Alliance | Linux-kernel-based mobile operating system; widely used by Samsung, Xiaomi, Vivo, OPPO and many other manufacturers. |
| 2 | iOS | Apple, United States | Proprietary operating system designed exclusively for Apple's iPhone devices. |
| 3 | HarmonyOS | Huawei, China | Huawei's operating system ecosystem for smartphones and other connected devices; capabilities and Android compatibility vary by version and market. |
| 4 | HarmonyOS NEXT | Huawei, China | Major HarmonyOS branch designed around native HarmonyOS applications rather than conventional Android application compatibility. |
| 5 | HyperOS | Xiaomi, China | Xiaomi's operating system platform for smartphones and connected devices; smartphone versions are based on Android. |
| 6 | One UI | Samsung, South Korea | Samsung's Android-based user interface and software platform for Galaxy smartphones and tablets. |
| 7 | OxygenOS | OnePlus, China | Android-based operating system used on OnePlus smartphones, with features varying by device and region. |
| 8 | ColorOS | OPPO, China | Android-based operating system used on OPPO smartphones. |
| 9 | OriginOS | Vivo, China | Vivo's Android-based smartphone operating system, primarily associated with its Chinese-market devices. |
| 10 | Funtouch OS | Vivo, China | Android-based operating system used on many Vivo smartphones in international markets, including India. |
| 11 | realme UI | Realme, China | Android-based operating system and user interface for Realme smartphones. |
| 12 | Nothing OS | Nothing, United Kingdom | Android-based operating system used on Nothing smartphones, featuring a distinctive visual design. |
| 13 | MagicOS | Honor, China | Android-based operating system platform for Honor smartphones and connected devices. |
| 14 | MyUX | Motorola, United States / Lenovo-owned | Android-based software experience used on Motorola smartphones; branding and features vary by generation. |
| 15 | Pixel UI | Google, United States | Google's Android software experience on Pixel devices, with Google services and Pixel-exclusive features. |
| 16 | Fire OS | Amazon, United States | Android-derived operating system used primarily on Amazon Fire tablets and selected devices; not a mainstream current smartphone platform. |
| 17 | KaiOS | KaiOS Technologies | Lightweight operating system for selected feature phones, supporting applications and internet connectivity on low-cost hardware. |
| 18 | Sailfish OS | Jolla, Finland | Linux-based mobile operating system with a gesture-driven interface and compatibility options that depend on device and version. |
| 19 | Ubuntu Touch | UBports community | Linux-based mobile operating system maintained by a community for supported smartphones and tablets. |
| 20 | postmarketOS | Open-source community | Linux-based mobile operating system intended to extend the useful life of smartphones and other mobile devices. |
| 21 | /e/OS | Murena / e Foundation | Android-based operating system emphasizing privacy and reduced dependence on Google services. |
| 22 | LineageOS | Open-source community | Community-developed Android-based operating system available for selected smartphones and tablets. |
| 23 | GrapheneOS | GrapheneOS community | Security- and privacy-focused Android-based operating system primarily designed for supported Google Pixel devices. |
| 24 | CalyxOS | Calyx Institute | Privacy-focused Android-based operating system for supported devices; device support and project status can change. |
| 25 | Replicant | Free Software community | Free-software-focused Android distribution supporting a limited set of devices. |
| 26 | BlackBerry OS | BlackBerry, Canada | Legacy proprietary smartphone operating system; associated services and support for older platforms have been discontinued. |
| 27 | BlackBerry 10 | BlackBerry, Canada | Linux-based proprietary smartphone operating system; discontinued and no longer a mainstream supported platform. |
| 28 | Windows Phone | Microsoft, United States | Former smartphone operating system featuring Live Tiles; discontinued. |
| 29 | Windows 10 Mobile | Microsoft, United States | Successor to Windows Phone; support ended in 2019. |
| 30 | Symbian OS | Symbian / Nokia ecosystem | Historic smartphone operating system widely used before Android and iOS became dominant; discontinued. |
| 31 | Nokia Series 40 | Nokia, Finland | Legacy platform for Nokia feature phones; not a modern smartphone operating system. |
| 32 | Palm OS | Palm, United States | Historic operating system for personal digital assistants and early smartphones; discontinued. |
| 33 | webOS | Palm / HP; later LG in other product categories | Originally developed for smartphones; its later use has focused mainly on smart TVs and other devices. |
| 34 | Bada | Samsung, South Korea | Former Samsung mobile operating system used on Wave smartphones; discontinued as a standalone platform. |
| 35 | Tizen | Linux Foundation / industry partners | Linux-based platform used in selected Samsung smartwatches, TVs and other devices; not a mainstream current smartphone OS. |
| 36 | Firefox OS | Mozilla, United States | Former web-technology-based mobile operating system developed for smartphones; discontinued. |
| 37 | Ubuntu for Phones | Canonical, United Kingdom | Historical Ubuntu smartphone project; the original commercial initiative was discontinued, with community work later continuing through Ubuntu Touch. |
| 38 | Maemo | Nokia, Finland | Historic Linux-based mobile platform used on selected Nokia internet tablets and the Nokia N900. |
| 39 | MeeGo | Nokia / Intel | Former Linux-based mobile platform associated with devices such as the Nokia N9; discontinued as a mainstream project. |
| 40 | Moblin | Intel, United States | Historic Linux-based platform designed for mobile internet devices and netbooks; its development contributed to later projects. |
| 41 | LiMo | LiMo Foundation | Historic Linux-based mobile platform initiative; its technologies and ecosystem evolved into later Linux mobile efforts. |
| 42 | Danger OS | Danger, Inc., United States | Legacy software platform associated with the T-Mobile Sidekick family of mobile devices. |
| 43 | RIM OS | Research In Motion, Canada | Earlier name commonly associated with the legacy BlackBerry smartphone operating system family. |
| 44 | REX | Operating system technology from the Qualcomm ecosystem | Embedded software technology used in some older mobile phones; not a modern general-purpose smartphone OS. |
| 45 | ThreadX / Azure RTOS | Express Logic / Microsoft | Real-time operating system used in embedded devices, potentially including components of mobile hardware; not a conventional smartphone OS. |
| 46 | FreeRTOS | Open-source community / Amazon | Real-time operating system for embedded devices and connected hardware; not a general-purpose smartphone OS. |
| 47 | Embedded Linux | Linux community and device vendors | Linux-based systems used in specialized handheld devices and embedded mobile equipment; configurations vary widely. |
| 48 | Android Open Source Project (AOSP) | Google and open-source contributors | Open-source foundation of Android; device makers can build customized operating systems from its source code. |
| 49 | Replicant-based custom systems | Free Software community | Specialized community-built Android-derived systems emphasizing software freedom; compatibility depends on the device. |
| 50 | Proprietary Feature-Phone OS | Various manufacturers | Closed operating systems developed for basic phones, often supporting calling, messaging and limited applications rather than full smartphone capabilities. |
Notes:
- Android and iOS are the two dominant operating systems in the global smartphone market.
- HarmonyOS, HyperOS, One UI, OxygenOS, ColorOS and similar names may describe a broader platform, a customized Android distribution or a user interface rather than an entirely independent operating system kernel.
- Open-source systems such as LineageOS, GrapheneOS and Ubuntu Touch serve particular privacy, security or customization needs, but device compatibility varies.
- Several entries are historical or discontinued operating systems. Their inclusion does not imply current development, security updates or official support.
- Real-time operating systems and embedded platforms are included for completeness, but they are not direct alternatives to Android or iOS for ordinary smartphone use.
- This list contains 50 operating systems, operating-system families, distributions and related mobile platforms; these categories are not all technically equivalent.
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