Developers

Build for the world’s third-largest OS

Already enabling over 100 million phones worldwide.

Why KaiOS

Easy to learn

Use HTML, CSS, and JavaScript to build web-based apps.

An audience of millions

Including first-time internet users from Asia, Africa, and South America.

A chance to make a difference

Build apps that improve lives.

A bold move

Stand out in a marketplace that isn’t crowded – yet.

Learn how to build KaiOS apps

Developer Portal →

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