KaiOS Operating System

KaiOS is a mobile operating system that is designed to run on low-powered phones and IoT devices. It offers a middle ground between traditional flip phones and full-fledged smartphones, supporting features like 4G LTE, GPS, and Wi-Fi. Originally based on Firefox OS, KaiOS is now web-based and offers users a few extra apps beyond calling and texting, making it a good option for those who want more than a basic phone but don't need all the features of a smartphone.

Developing for KaiOS

To develop an app for KaiOS, you will need to use web technologies such as HTML, CSS, and JavaScript. You can find more information on how to develop KaiOS apps on the KaiOS developer portal.


Here's an example of a simple HTML5 app that can be developed for KaiOS −

<!DOCTYPE html>
      <title>Hello KaiOS!</title>
      <h1>Hello KaiOS!</h1>
      <p>This is a simple HTML5 app developed for KaiOS.</p>

Comparing KaiOS to other Operating Systems

When it comes to comparing KaiOS with other operating systems like iOS and Android, there are several factors that come into play. One of the most significant differences between KaiOS and other operating systems is its low memory requirement. KaiOS only needs 256 MB of memory, while iOS and Android require significantly more.

Another factor that sets KaiOS apart is its HTML5-based application store. Unlike iOS and Android, which use Java-based software, KaiOS's app store is HTML5-based. This means that it uses fewer resources, and the apps run much faster on this operating system.

Additionally, KaiOS's app store is much more open than those of other operating systems, and developers can upload their programs directly to the app store. The app selection on KaiOS is also broader than that of iOS and Android and includes all the essential messaging apps

Best phones that support KaiOS

There are several phones that support KaiOS, but here are some of the best −

  • Nokia 8110 4G: This phone comes with a 2.4-inch display, a 2-megapixel rear camera, 4 GB of extendable storage, and 512 MB of RAM. It is unique, inexpensive, and powerful.

  • Alcatel Go Flip 2: The first phone to use KaiOS, this phone has a simple design that looks like a vintage phone. It is slightly inferior to the Nokia 8110 4G and Jio Phone 2 but is a less expensive phone that works very effectively.

  • Jio Phone 2: This phone has 512 MB of RAM and 4 GB of storage, just like the Nokia 8110 4G. It has a 2000mAh battery and extendable storage.

KaiOS vs. iOS and Android

KaiOS offers texting capabilities, an app store, and a web browser similar to iOS and Android. However, there are several differences between KaiOS and other operating systems −


iOS and Android

HTML5-based app store making it easier for tech companies to develop apps for KaiOS.

Usually not an HTML-based app store.

Low memory requirement of only 256 MB.

Require significantly more.

Broad app selection that includes all essential messaging apps and is comparatively more open than those of other stores.

Not as open as iOS and Android’s app stores.

Scope for KaiOS

KaiOS has immense scope in emerging markets like India. For instance, Reliance Jio, a network that has disrupted the local mobile industry with significantly discounted 4G data plans, sold subsidized phones that run KaiOS software. According to a report by Counterpoint Research, KaiOS had a 46% market share in India in the first quarter of 2019, ahead of both iOS and Android. This growth in popularity is due to KaiOS's low memory requirement, which makes it ideal for low-end phones that are affordable to a large segment of the Indian population.

Limitations of KaiOS

  • Limited app availability compared to iOS and Android.

  • User interface and experience may not be as polished as other operating systems.

  • Limited support for third-party hardware accessories.

  • Limited support for high-end features like high-resolution displays and advanced camera features.

Features of KaiOS

  • KaiOS is suitable for low-end phones since it requires only 256 MB of memory to run.

  • KaiOS supports almost all modern connectivity features like 4G LTE, GPS, VoLTE, and Wi-Fi despite its low memory requirement.

  • KaiOS uses fewer resources than Java-based software since it has an HTML5-based application store. This usually allows apps to run faster.

  • The app store in KaiOS compared to those of other operating systems. This makes it easier for tech companies to develop apps for this OS.

  • Developers can upload their programs directly to the app store. This results in a broad app selection inclusive of essential messaging apps like Facebook, Twitter, YouTube, Google Maps, Search, and Assistant apps.


KaiOS is an innovative and versatile operating system for low-powered phones and IoT devices that provides a great user experience. Its low memory requirement, modern connectivity features, and broad app selection make it perfect for emerging markets. With Google investing over $20.

Updated on: 03-May-2023


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