Oskar

@o_kwasniewski • 8,136 subscribers

Co-Founder / CTO @TesterArmy (YC P26), previously @callstackio

Shorts

Here are two Liquid Glass effects: one made with React Native and the other with SwiftUI. Can you tell which is which? 👀

Here are two Liquid Glass effects: one made with React Native and the other with SwiftUI. Can you tell which is which? 👀

639,877 просмотров

v0.10.0 is out! 🚀 🆕 Easily upload files to device and open the filesystem in Finder. Works on both Android and iOS 🔥 Huge thanks to xjki for contributing this feature!

v0.10.0 is out! 🚀 🆕 Easily upload files to device and open the filesystem in Finder. Works on both Android and iOS 🔥 Huge thanks to xjki for contributing this feature!

57,086 просмотров

I just released NoteScan - a dead simple app for people who think on paper ✍️ Point camera → AI reads handwriting → Copy text. That's it. Built with Expo and Gemini 3 Flash. Here is a demo 👇🏻

I just released NoteScan - a dead simple app for people who think on paper ✍️ Point camera → AI reads handwriting → Copy text. That's it. Built with Expo and Gemini 3 Flash. Here is a demo 👇🏻

72,680 просмотров

The first version of React Native Vision OS is out! 🎉🥽 You can init your project using this command: `npx @callstack/react-native-visionos init MyApp` We are still in the early stages of development. If you encounter any bugs, please don't hesitate to open a new issue 🙏

The first version of React Native Vision OS is out! 🎉🥽 You can init your project using this command: `npx @callstack/react-native-visionos init MyApp` We are still in the early stages of development. If you encounter any bugs, please don't hesitate to open a new issue 🙏

278,823 просмотров

React Native Bottom Tabs v0.9.2 is out! ✨ - Tabs are now properly working on iOS 26 🚀 - Measure custom tab bars (for useBottomTabBarHeight) 📏 - Initial layout fixes 📱 Check it out:

React Native Bottom Tabs v0.9.2 is out! ✨ - Tabs are now properly working on iOS 26 🚀 - Measure custom tab bars (for useBottomTabBarHeight) 📏 - Initial layout fixes 📱 Check it out:

119,150 просмотров

React Native Bottom Tabs 1.0.0 is out ✨ - Drops old architecture 🌅 - Simplifies build configuration, making it fully compatible with Expo Image ✅ - Bunch of bug fixes 🐛 It works with Expo router, React Navigation and in standalone mode ⬇️

React Native Bottom Tabs 1.0.0 is out ✨ - Drops old architecture 🌅 - Simplifies build configuration, making it fully compatible with Expo Image ✅ - Bunch of bug fixes 🐛 It works with Expo router, React Navigation and in standalone mode ⬇️

76,602 просмотров

constantly iterating on TesterArmy (YC P26) landing page design ✨

constantly iterating on TesterArmy (YC P26) landing page design ✨

22,985 просмотров

Introducing (React) Native Bottom Tabs! 🎉 First Bottom Tab Navigator using Native Platform primitives for both Android and iOS. The API surface is almost a drop-in replacement for JS Bottom Tabs! ➡ `npm i react-native-bottom-tabs`

Introducing (React) Native Bottom Tabs! 🎉 First Bottom Tab Navigator using Native Platform primitives for both Android and iOS. The API surface is almost a drop-in replacement for JS Bottom Tabs! ➡ `npm i react-native-bottom-tabs`

82,835 просмотров

new TesterArmy (YC P26) landing page just dropped 👀

new TesterArmy (YC P26) landing page just dropped 👀

13,198 просмотров

Exposing SwiftUI views to React Native is a powerful feature! 👀 Here is an example of a SwiftUI paywall in React Native with just a few lines of SwiftUI code! A blog post on how to create native views using SwiftUI is coming soon! ✨

Exposing SwiftUI views to React Native is a powerful feature! 👀 Here is an example of a SwiftUI paywall in React Native with just a few lines of SwiftUI code! A blog post on how to create native views using SwiftUI is coming soon! ✨

45,371 просмотров

New version of @⁠callstack/liquid-glass has been released! This one makes use of the new iOS 26 API for border radius, making it compatible with context menus from Zeego 🔥 You can now achieve this awesome merge effect ⬇️

New version of @⁠callstack/liquid-glass has been released! This one makes use of the new iOS 26 API for border radius, making it compatible with context menus from Zeego 🔥 You can now achieve this awesome merge effect ⬇️

23,299 просмотров

Lately, I’ve been tightening my agentic coding loop - making sure what my coding agent ships actually works. Today I built a small CLI: ⁠𝚛𝚗-𝚕𝚘𝚐𝚜 🔍 It connects via CDP to pull React Native Metro logs allowing your agent to see what's going on. Here is a small demo ⬇️

Lately, I’ve been tightening my agentic coding loop - making sure what my coding agent ships actually works. Today I built a small CLI: ⁠𝚛𝚗-𝚕𝚘𝚐𝚜 🔍 It connects via CDP to pull React Native Metro logs allowing your agent to see what's going on. Here is a small demo ⬇️

14,858 просмотров

New release of `react-native-bottom-tabs`! 🚀 This one includes a new Expo Config plugin that sets the correct styling for tabs on Android! 🤖 Here is a demo of Expo SDK 52 + Expo Router on New Architecture:

New release of `react-native-bottom-tabs`! 🚀 This one includes a new Expo Config plugin that sets the correct styling for tabs on Android! 🤖 Here is a demo of Expo SDK 52 + Expo Router on New Architecture:

36,481 просмотров

A new version of React Native Bottom Tabs 0.8.0 is out! 🎉 Lots of work went into this release: - Complete refactoring of Android view management ♻️ - New Android Page Transitions ✨ - Material You support 🎨 - Other bug fixes 🔧

A new version of React Native Bottom Tabs 0.8.0 is out! 🎉 Lots of work went into this release: - Complete refactoring of Android view management ♻️ - New Android Page Transitions ✨ - Material You support 🎨 - Other bug fixes 🔧

27,887 просмотров

Liquid Glass buttons in React Native 🔍 I did a small POC, should I make it a library? (Android would have its native button equivalent)

Liquid Glass buttons in React Native 🔍 I did a small POC, should I make it a library? (Android would have its native button equivalent)

21,381 просмотров

React Native Bottom Tabs 0.5.0 is out 🚀🎉 - SVG Support 🖼️🥳 - Remote icon assets 🌐 - Custom fonts, label styles 🎨 - Bug fixes 🐛

React Native Bottom Tabs 0.5.0 is out 🚀🎉 - SVG Support 🖼️🥳 - Remote icon assets 🌐 - Custom fonts, label styles 🎨 - Bug fixes 🐛

28,135 просмотров

Bottom Accessory view is coming soon to React Native Bottom Tabs! 🚀 Huge thanks to Johan Kasperi for contributing this 🙏 This looks so cool ⬇️

Bottom Accessory view is coming soon to React Native Bottom Tabs! 🚀 Huge thanks to Johan Kasperi for contributing this 🙏 This looks so cool ⬇️

14,721 просмотров

Looks like we can place UIKit views in the accessory view! 🚀 Here is a small demo of iOS 26 accessory view running with React Native Bottom Tabs 🔥 Time to think about a good API for this 😄

Looks like we can place UIKit views in the accessory view! 🚀 Here is a small demo of iOS 26 accessory view running with React Native Bottom Tabs 🔥 Time to think about a good API for this 😄

18,361 просмотров

The blog post about exposing SwiftUI views to React Native is out! ✨ It shows you how to build a SwiftUI paywall in React Native with just a few lines of SwiftUI code! Check it out on Callstack Engineers blog 🎉

The blog post about exposing SwiftUI views to React Native is out! ✨ It shows you how to build a SwiftUI paywall in React Native with just a few lines of SwiftUI code! Check it out on Callstack Engineers blog 🎉

20,794 просмотров

Here is an example of using multiple windows on iPadOS with React Native! ✨ Thanks to React Native Factory integrating this became a lot easier and now I'm working on first-party support for this feature! 👀

Here is an example of using multiple windows on iPadOS with React Native! ✨ Thanks to React Native Factory integrating this became a lot easier and now I'm working on first-party support for this feature! 👀

21,638 просмотров

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this is what AUTOMATED UI testing looks like

this is what AUTOMATED UI testing looks like

301,518 просмотров • 2 месяцев назад

crazy that people still test onboarding by hand

crazy that people still test onboarding by hand

53,870 просмотров • 2 месяцев назад

this is what AGENTIC UI testing looks like

this is what AGENTIC UI testing looks like

38,351 просмотров • 2 месяцев назад

In January I released NoteScan - a dead simple app for people who think on paper✏️ Now the app has over 1K+ downloads and people are loving it! ✨ If you write by hand, you need this.

In January I released NoteScan - a dead simple app for people who think on paper✏️ Now the app has over 1K+ downloads and people are loving it! ✨ If you write by hand, you need this.

22,810 просмотров • 4 месяцев назад

The new version of React Native Bottom Tabs is out! 🎉 A new highly anticipated feature: Custom JavaScript Tabs! ✨ Provide your custom tab bar while leveraging native navigation underneath 🚀 Here is a demo of it in the 🦋 app! This demonstrates smooth screen transitions using native animations along with their custom tab bar.

The new version of React Native Bottom Tabs is out! 🎉 A new highly anticipated feature: Custom JavaScript Tabs! ✨ Provide your custom tab bar while leveraging native navigation underneath 🚀 Here is a demo of it in the 🦋 app! This demonstrates smooth screen transitions using native animations along with their custom tab bar.

35,725 просмотров • 1 год назад

Introducing React Native Emoji Popup 🌈 Emoji Picker that uses native primitives ⚡ I've created it for a side-project I'm working on and decided to open-source it✨

Introducing React Native Emoji Popup 🌈 Emoji Picker that uses native primitives ⚡ I've created it for a side-project I'm working on and decided to open-source it✨

24,316 просмотров • 1 год назад

React Native WebGPU on visionOS! 🥽 A few weeks ago William Candillon released React Native react-native-webgpu and we've managed to run it on visionOS! 🎉 PR is still WIP but this looks awesome 🤩 Great job William Candillon, Krzysztof Piaskowy 👏

React Native WebGPU on visionOS! 🥽 A few weeks ago William Candillon released React Native react-native-webgpu and we've managed to run it on visionOS! 🎉 PR is still WIP but this looks awesome 🤩 Great job William Candillon, Krzysztof Piaskowy 👏

28,632 просмотров • 1 год назад

🪄 Cali: An AI agent for building React Native apps This tool is so simple yet so powerful, can help you with bunch of things while building your React Native apps (more coming soon!) ➡️ npx cali Hacked together with Mike this weekend 😄🚀

🪄 Cali: An AI agent for building React Native apps This tool is so simple yet so powerful, can help you with bunch of things while building your React Native apps (more coming soon!) ➡️ npx cali Hacked together with Mike this weekend 😄🚀

17,707 просмотров • 1 год назад

React Native SwiftUI TabView is now renamed to Native Bottom Tabs ✨ NPM Package name: `react-native-bottom-tabs` secured ✅ Now its time to establish good cross platform API, provide same features on both platforms and make it stable 😅

React Native SwiftUI TabView is now renamed to Native Bottom Tabs ✨ NPM Package name: `react-native-bottom-tabs` secured ✅ Now its time to establish good cross platform API, provide same features on both platforms and make it stable 😅

Oskar Kwaśniewski

17,889 просмотров • 1 год назад

What is the difference between React Native JS Bottom Tabs and Native Bottom Tabs? 👀 Native bottom tabs use native platform primitives to render tabs (TabView from SwiftUI and BottomNavigationView on Android), while JS Tabs recreate this UI as closely as possible. This approach works well but tabs can have different appearances on different platforms, here is an example:

What is the difference between React Native JS Bottom Tabs and Native Bottom Tabs? 👀 Native bottom tabs use native platform primitives to render tabs (TabView from SwiftUI and BottomNavigationView on Android), while JS Tabs recreate this UI as closely as possible. This approach works well but tabs can have different appearances on different platforms, here is an example:

15,830 просмотров • 1 год назад

I’ve opened a PR to React Native to add support for 120 FPS Animations while using the Animated API 🚀 Check it out:

I’ve opened a PR to React Native to add support for 120 FPS Animations while using the Animated API 🚀 Check it out:

Oskar Kwaśniewski

10,961 просмотров • 1 год назад

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