Oskar

@o_kwasniewski • 8,079 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? 👀

639,876 次观看

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

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

22,801 次观看

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!

56,974 次观看

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 👇🏻

71,808 次观看

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 次观看

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 次观看

new TesterArmy (YC P26) landing page just dropped 👀

new TesterArmy (YC P26) landing page just dropped 👀

13,198 次观看

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`

82,828 次观看

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 次观看

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 次观看

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 次观看

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 次观看

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 次观看

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 ⬇️

14,702 次观看

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 次观看

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 次观看

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 次观看

For the past few days, I've been working on a rewrite of `react-native-pager-view` for iOS ✨ The goal was to resolve a bunch of long-standing issues that were unfixable in the previous implementation. The library now uses SwiftUI under the hood 🍏

For the past few days, I've been working on a rewrite of `react-native-pager-view` for iOS ✨ The goal was to resolve a bunch of long-standing issues that were unfixable in the previous implementation. The library now uses SwiftUI under the hood 🍏

13,777 次观看

What's cool about using native platform components is that they integrate seamlessly with other UI elements✨ React Native Bottom Tabs handles Picture-in-picture avoiding automatically 😄 Here is a comparison of JS vs Native Tabs:

What's cool about using native platform components is that they integrate seamlessly with other UI elements✨ React Native Bottom Tabs handles Picture-in-picture avoiding automatically 😄 Here is a comparison of JS vs Native Tabs:

19,395 次观看

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this is what AUTOMATED UI testing looks like

this is what AUTOMATED UI testing looks like

299,368 次观看 • 1 个月前

crazy that people still test onboarding by hand

crazy that people still test onboarding by hand

53,736 次观看 • 28 天前

this is what AGENTIC UI testing looks like

this is what AGENTIC UI testing looks like

38,147 次观看 • 29 天前

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.

22,746 次观看 • 3 个月前

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 次观看 • 1 年前

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✨

24,283 次观看 • 1 年前

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 👏

Oskar Kwaśniewski

28,562 次观看 • 1 年前

🪄 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 😄🚀

17,701 次观看 • 1 年前

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 次观看 • 1 年前

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 次观看 • 1 年前

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 次观看 • 1 年前

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