- 240x320 ~2.4-3" displays
- 256mb or 512mb RAM
- 3G or 4G
- ARM CPUs
- Qualcomm, Spreadtrum & Mediatek
- ~1GHz - 1.3GHz
- Dual or Quad Core
- T9 or QWERTY keyboards
- D-Pad & Soft-Key (LSK & RSK) navigation
- WiFI & Bluetooth (optional)
No. KaiOS has a number of popular apps, including:
- Google Assistant
- Google Search
- Google Maps
- Microsoft Outlook
As of February 2023, most other popular social network, music streaming, chat, or shopping apps are not available. The following are not officially available on KaiOS:
- Gmail (use default Email app)
- Reddit (see Zap Reddit)
- Telegram (see Telekram, an open-source client)
No, KaiOS does not support group text messages (SMS or MMS). Also KaiOS does not support Rich Communication Services (RCS) used by modern Android phones as a subtitute for Apple’s iMessage.
KaiOS is a proprietary operating system based on Firefox OS, which was released under the “file-level” Mozilla Public License (MPL) 2.0. Parts of KaiOS source is available on KaiOS Tech’s GitHub.
Thanks to a combination of hardware and software upgrades, newer KaiOS 3.0 devices are noticeably smoother than older models running KaiOS 2.5. From a user perspective, there’s little discernable difference. Most of the changes are under the hood. Here’s a summary of key differences.
|KaiOS 2.5||KaiOS 3.0|
|Debug Enabled||Select Models||No|
Note: Many popular apps like Facebook and WhatsApp are not available on KaiOS 3.0. Additionally, you cannot sideload apps on KaiOS 3.0 so it’s not possible to debug apps on KaiOS 3.0 devices.
No KaiOS 2.5 device has received an over-the-air (OTA) update with KaiOS 3.0, nor has KaiOS 3.0 been ported to older devices.
No. It might be possible to port older versions of Android or MocorDroid to KaiOS phones, but not without great effort.
No, Android apps are distributed as Android Packages (.apk) that require the Android Runtime (ART).
No, KaiOS does not include the Java 2 Mobile Edition (J2ME) runtime. It is possible to emulate J2ME on KaiOS with emulators like Project Kava but compabilitiy and usability will likely be poor.
Yes, there is an NES Emulator for KaiOS 3.0. Similar projects might work on KaiOS 2.5, but with poor performance.