2025-12-01 · #13
React Native Weekly #13 Hermes JSON Speed Boost, react-native-ai Example App, Unreal Engine Integration and more
Details Published on the v0 App Implementation#
Vercel’s Fernando Rojo has shared an in-depth breakdown of the implementation behind the recently released v0 iOS app. v0 was built with Expo, and it serves as a great example of just how high-quality an app you can build with React Native.
New blog post: How we built the v0 iOS app - staggered stream animations - pushing messages up top - fading in new messages - keyboard handling - floating composer - pasting images - sharing code - native UI + more Read the full technical breakdown below.
How we built the v0 iOS appThe v0 engineering team breaks down the challenges and decisions behind building the v0 app for iOS.Vercel
JSON Parsing Speed Boost in Hermes#
JSON parsing in Hermes, the JS engine used by React Native, has apparently been made 2.7–3.4× faster. This is available on the Static Hermes branch, so it will likely be a little while before React Native users can take advantage of it in practice.
Big news for Hermes JSON parsing. Michael from our team worked on speeding it up for the last month - the result is between 2.7x-3.4x faster! It is available in the static_h branch now and will be included in the next stable releases. Incomplete list of improvements: - Switch to
An Example App Built with react-native-ai#
An app built using react-native-ai — which enables on-device AI in React Native — has been released. It’s also published as OSS, so it should be a handy reference when working with react-native-ai.
the first app using react-native-ai was just published to app store and it's open source!! 🔥 it's really amazing to see first adopters of @react-native-ai/apple! 😍
react-native-nitro-symbols Released#
react-native-nitro-symbols, a library that lets you use iOS SF Symbols, has been released. It’s built with Nitro Modules for high performance and type safety.
Stoked to introduce react-native-nitro-symbols. A library for accessing native iOS SFSymbols in your react native/expo apps with the speed of nitro! - Fully typesafe using sf-symbols-typescript by @fernandorojo
react-native-bottom-tabs 1.0.3 Released#
react-native-bottom-tabs 1.0.3, which lets you use native bottom tabs in React Native, has been released. This update includes a fix for SVG on Android and experimentally adds Bottom Accessory View support for iOS 26 and above.
Just published React Native Bottom Tabs 1.0.3 🚀 - Android SVG fixes - Experimental support for bottom accessory view Thanks to everyone who contributed! 🙏 Check out release notes here: github.com/callstackincubator/…
react-native-actions-sheet v10 Released#
v10 of react-native-actions-sheet, which provides a sheet UI for React Native, has been released. The update includes a wide range of changes: migration to Reanimated, edge-to-edge support, keyboard improvements, and better support for lists and ScrollView.
react-native-actions-sheet V10 is finally here. - Migrated to use react-native-reanimated - Edge to edge handling - Improved Keyboard behaviour - Better support for Lists and ScrollViews - and much more! Release Notes: github.com/ammarahm-ed/react-n…
React Native Unreal Engine in Development?#
While React Native Godot already makes it possible to embed the Godot game engine in React Native, it looks like Unreal Engine support might be on the way as well.
React Native for Unreal Engine 🔜
React Native Advent Calendar 2025#
It starts today! There are still spots open, so feel free to join in!
React Native - Qiita Advent Calendar 2025 - QiitaCalendar page for Qiita Advent Calendar 2025 regarding React Native.Qiita
One More Thing#
The attention to quality in the v0 app is just incredible…! They’ve set their sights on winning an Apple Design Award, and honestly it looks like it’s more than worthy of one.
To make it all happen in React Native, they tackled all kinds of challenges — and when needed, even patched issues deep inside React Native itself.
Can’t wait for the Android version to drop!