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If you haven't heard of KaiOS before, you probably think Firefox OS is entirely dead. But actually, as a fork of B2G, KaiOS has silently grown to a user base of more than 100 million people on devices from more than 10 manufacturers, making it the third most-popular mobile OS after Android and iOS now.

They just launched proper developer docs, as well as an app store:

* https://www.kaiostech.com/meet-the-devices-that-are-powered-by-kaios/
* https://developer.kaiostech.com/

Mastodon client for KaiOS, when? All JS/Web clients should work.