I dug around a little and installed their demo app in the iOS simulator: https://www.dropbox.com/s/hl3nk8jrcjleurj/hippy.mov?dl=0. Visually, the only interesting part of the demo app is the RefreshWrapper example

Code-wise, the most interesting things I've seen:

- They expose wrappers for native recycling list views[0]. React Native does this in JavaScript through VirtualizedList, however some have experienced performance issues with it[1]

- They wrote their own flexbox layout library[2] (likely based on Yoga)

- It works with both Vue[3] and React

- Hippy supports web as a build target out of the box[4] (react-native-web is a 3rd party library)

- Touch events work on the `<View />` component directly, instead of needing to wrap `<View />`'s in the `<Touchable />` components[5]

- It uses a closed-source fork of libv8 on Android called X5[6].

The API & coding style is quite similar to React Native, but the implementation seems different. I'm guessing this started as an internal fork of React Native and turned into a large refactor, but that's just a guess

[0]: https://github.com/Tencent/Hippy/blob/master/ios/sdk/compone...

[1]: https://github.com/facebook/react-native/issues/13413

[2]: https://github.com/Tencent/Hippy/tree/master/layout

[3]: https://github.com/Tencent/Hippy/tree/master/packages/hippy-...

[4]: https://github.com/Tencent/Hippy/tree/master/packages/hippy-...

[5]: https://github.com/Tencent/Hippy/tree/master/packages/hippy-...

[6]: https://github.com/Tencent/Hippy/issues/9#issuecomment-56822...

> - It uses a closed-source fork of libv8 on Android called X5[6].

this makes my spidey senses tingle. What might be hidden there?

I agree. If Facebook had a closed source lib in RN it would be DOA.

I would be very curious to know why and if there are plans to replace with open source.