KaiOS Technologies is a Hong Kong-based company with offices in mainland China, Taiwan, India, France, and the United States.
Our product is the mobile operating system KaiOS, which is based on the Firefox OS open-source project.
KaiOS powers a new category of internet-enabled devices known as smart feature phones.
Learn more about our history and mission.
KaiOS powers smart feature phones—affordable, internet-enabled devices that require low memory. Visit our website for more information.
We partner with manufacturers and carriers to make smart feature phones available worldwide. We also work with developers to deliver content our users love. See our updated list.
To learn more about partnering with KaiOS, please visit this page.
You can find KaiOS-powered devices in:
This page lists all KaiOS devices and where they are available for purchase.
The available functionalities vary per device. Generally speaking, KaiOS supports features such as voice calls, text messages, contacts, camera, calendar, music, clock, and email. It’s up to manufacturers to decide which of them to implement.
You can find information about specific devices on this page. To learn more about the features available on a particular device, please check the device manufacturer’s website.
You can use the photo editor to rotate, crop, apply filters to, and adjust the brightness, contrast, and exposure of photos.
The new version of the photo will be saved to the Gallery. The original photo will not be deleted.
You can add multiple recipients to one same text message. You will still be sending individual text messages; the advantage is that you will only type the content of the text message once. Recipients can respond to your text individually.
Third-party communication apps such as WhatsApp support group chat.
You can open and read email attachments in PDF, JPEG, PNG, and other formats. To open a specific type of file, you may need to download a reader app from the KaiStore. To find reader apps, check the Utilities tab.
Important: KaiOS supports video calls on 4G mobile phones. To make video calls on 3G mobile phones, download a third-party app.
KaiOS supports video calls on 4G mobile phones, but available functionalities can vary per device. You can find information about specific devices on this page. To learn more about the features available on a particular device, please check your device manual or contact the device manufacturer.
KaiOS does not currently support copy and paste. We are always improving the OS, so this feature may become available in the future.
Updating your apps in KaiStore to make sure you have the latest features and the best performance with improved security and stability.
To download the latest version of an app, you must:
KaiOS 3.0 is only available on select KaiOS devices. Some newly released KaiOS devices in North America will ship with KaiOS 3.0 preloaded.
You will get notifications when updates are available for you. Alternatively, you can regularly check the Software Update in Settings to see if the latest update is available for your device.
Download updates:
Important: Older devices running KaiOS 2.5.4 or lower can’t run the new KaiOS 3.0 version.
The latest version of KaiOS is 3.0, released in September 2021. It is a complete upgrade since KaiOS 2.5, packing the latest Mozilla Gecko engine (version 84) and comes with the latest chipset Board Support Package & Linux kernel.
New web technologies available with richer web content, enabling users to generate real-time, collaborative content easily
Stability
Performance
Optimized UI design in messaging apps to make them more intuitive, by rearranging and renaming softkeys. This makes the apps more user-friendly while keeping the design clean and aligned
Apps running on KaiOS 3.0 are required to be optimized for the new platform, so app developers would need to make changes to their existing apps on KaiOS 2.5 to adapt to the platform changes.
You’ll find some existing apps on KaiOS 2.5 already migrated to the KaiStore 3.0 platform as soon as you unbox your new device with 3.0 preloaded. Stay tuned as there’ll be more to come.
Note: WhatsApp is currently not available on KaiOS 3.0. Please contact WhatsApp directly and let them know you’d like a KaiOS version of the app at https://www.whatsapp.com/contact/?subject=messenger.