After burning through tens of billions of tokens, I built an Android-like OS that runs entirely in the browser

After burning through tens of billions of tokens, I built an Android-like OS that runs entirely in the browser

The title is a bit clickbaity, but it is not that far from what actually happened.

Over the past few months, we built MobileGym: a fully browser-based, Android-like simulation environment implemented in TypeScript + React.

It currently includes 28 simulated apps, including WeChat, Alipay, Xiaohongshu/RED, bilibili, X, Reddit, WeChat Read, China Railway 12306, Tencent Meeting, Spotify, and eBay, plus system apps such as Home, Settings, Contacts, Messages, Photos, Calendar, Files, and Browser.

The system supports Xiaomi theme packs and custom widgets. We also reimplemented a number of Android-like system mechanisms directly in the browser, including the Activity stack, Intents, gesture navigation, back handling, and soft keyboard behavior.