Callstack
@callstack.com
We enable engineering teams to scale apps across mobile, web, and TV with React Native and our OSS. Hosts of @reactuniverseconf.com
Get to know us at www.callstack.com
Get to know us at www.callstack.com
Reposted by Callstack
November 7, 2025 at 1:13 PM
Meta's $1.5M React Native competition for Meta Quest is on. Wondering what to build? @jwr.ski brainstormed 4 app ideas that go beyond 2D ports, from social to meditation apps. Get your inspiration (and tool suggestions) before you start coding ⬇️ clstk.com/3LiPQep
November 6, 2025 at 11:24 AM
Meta's $1.5M React Native competition for Meta Quest is on. Wondering what to build? @jwr.ski brainstormed 4 app ideas that go beyond 2D ports, from social to meditation apps. Get your inspiration (and tool suggestions) before you start coding ⬇️ clstk.com/3LiPQep
Tomorrow, we’re talking brownfield React Native with Zalando. We’ll cover how it fits into an existing native codebase, how to structure it, and what still feels awkward in practice.
Sign up for a live walkthrough & Q&A session 🎙️ clstk.com/3JIbisy
Sign up for a live walkthrough & Q&A session 🎙️ clstk.com/3JIbisy
November 4, 2025 at 6:17 AM
Tomorrow, we’re talking brownfield React Native with Zalando. We’ll cover how it fits into an existing native codebase, how to structure it, and what still feels awkward in practice.
Sign up for a live walkthrough & Q&A session 🎙️ clstk.com/3JIbisy
Sign up for a live walkthrough & Q&A session 🎙️ clstk.com/3JIbisy
Can you use your favorite Expo & React Native libraries on Meta Quest? Mostly, yes. But for key native features, you'll need specific alternatives.
@jwr.skiwrote a guide on what works, what doesn't, and what to use instead. Save yourself the guesswork and read it now ⬇️ clstk.com/4ojKhLh
@jwr.skiwrote a guide on what works, what doesn't, and what to use instead. Save yourself the guesswork and read it now ⬇️ clstk.com/4ojKhLh
October 30, 2025 at 3:55 PM
Can you use your favorite Expo & React Native libraries on Meta Quest? Mostly, yes. But for key native features, you'll need specific alternatives.
@jwr.skiwrote a guide on what works, what doesn't, and what to use instead. Save yourself the guesswork and read it now ⬇️ clstk.com/4ojKhLh
@jwr.skiwrote a guide on what works, what doesn't, and what to use instead. Save yourself the guesswork and read it now ⬇️ clstk.com/4ojKhLh
Reminder 📅 We’re hosting a live session on how React Native fits into an existing mobile app with native code and platform constraints. Expect a walkthrough of Zalando’s architecture, migration decisions, and dev experience solutions, plus time for live Q&A: clstk.com/3WZ0OrN
October 29, 2025 at 9:04 AM
Reminder 📅 We’re hosting a live session on how React Native fits into an existing mobile app with native code and platform constraints. Expect a walkthrough of Zalando’s architecture, migration decisions, and dev experience solutions, plus time for live Q&A: clstk.com/3WZ0OrN
Not all migration stories look the same. For the NFL app, greenfield made more sense than brownfield in 2018. The tech wasn’t there, and a ground-up rebuild made more sense from the business goals perspective.
Tune in to the episode for the full migration story clstk.com/4np2q9e
Tune in to the episode for the full migration story clstk.com/4np2q9e
October 27, 2025 at 11:06 AM
Not all migration stories look the same. For the NFL app, greenfield made more sense than brownfield in 2018. The tech wasn’t there, and a ground-up rebuild made more sense from the business goals perspective.
Tune in to the episode for the full migration story clstk.com/4np2q9e
Tune in to the episode for the full migration story clstk.com/4np2q9e
Here comes the playbook for testing React Native TV apps. @thymikee.bsky.social covers the whole process: adapting your JS tests for remote focus, writing E2E automation with WebdriverIO and Appium, and the crucial final step of testing on real hardware using device farms 📖 clstk.com/4n4epsn
From Unit to E2E: A Guide to Testing React Native TV in 2026
Standard mobile testing tools fail for React Native TV apps due to D-pad navigation. This guide shows how to build custom helpers for React Native Testing Library that emit hardware key events and how...
clstk.com
October 24, 2025 at 7:45 AM
Here comes the playbook for testing React Native TV apps. @thymikee.bsky.social covers the whole process: adapting your JS tests for remote focus, writing E2E automation with WebdriverIO and Appium, and the crucial final step of testing on real hardware using device farms 📖 clstk.com/4n4epsn
Zalando is integrating React Native into a large production app using a brownfield setup.
On Nov 5, we’ll team up to share how their engineers are handling interop, dev experience, and gradual migration.
🕔 5PM CET
🎙 Sign up to join the live session at clstk.com/3L8wici
On Nov 5, we’ll team up to share how their engineers are handling interop, dev experience, and gradual migration.
🕔 5PM CET
🎙 Sign up to join the live session at clstk.com/3L8wici
October 23, 2025 at 12:54 PM
Zalando is integrating React Native into a large production app using a brownfield setup.
On Nov 5, we’ll team up to share how their engineers are handling interop, dev experience, and gradual migration.
🕔 5PM CET
🎙 Sign up to join the live session at clstk.com/3L8wici
On Nov 5, we’ll team up to share how their engineers are handling interop, dev experience, and gradual migration.
🕔 5PM CET
🎙 Sign up to join the live session at clstk.com/3L8wici
AI SDK 5 is a major rewrite. @lgrammel.bsky.social (@vercel.com) explains why it was necessary and breaks down the new architecture: a v2 provider spec, end-to-end type safety, and new controls for building agentic, multimodal tool-calling loops ➡️ youtu.be/xgR-Jr9oSxA
AI SDK 5: What’s New and What’s Next by Lars Grammel | AI Meetup in Wrocław, September 2025
YouTube video by Callstack
youtu.be
October 23, 2025 at 11:26 AM
AI SDK 5 is a major rewrite. @lgrammel.bsky.social (@vercel.com) explains why it was necessary and breaks down the new architecture: a v2 provider spec, end-to-end type safety, and new controls for building agentic, multimodal tool-calling loops ➡️ youtu.be/xgR-Jr9oSxA
Our latest guide shows how to get started with React Native on Meta Quest VR using Expo. From quick setup with Expo Go to leveraging full development builds for HorizonOS, we cover everything you need to build immersive experiences with your existing skills ➡️ clstk.com/475KYSh
Getting Started With Expo on Meta Quest
Start building React Native apps for Meta Quest with Expo. This guide details the setup using Expo Go for fast iteration and explains how to use development builds for full native capabilities on Met ...
clstk.com
October 22, 2025 at 12:15 PM
Our latest guide shows how to get started with React Native on Meta Quest VR using Expo. From quick setup with Expo Go to leveraging full development builds for HorizonOS, we cover everything you need to build immersive experiences with your existing skills ➡️ clstk.com/475KYSh
Adapting React for TV brings unique UI challenges like focus management & D-pad navigation. In this talk, Amazon’s Eric Fahsl demos Kiro.dev, a spec-driven AI assistant that turns prompts into structured tasks to solve these problems predictably ➡️ clstk.com/4o2XDLI
Spec-Driven-Development With Kiro.dev | Callstack
Adapt React apps for TV with predictable AI. Amazon's Eric Fahsl demos Kiro.dev, a spec-driven assistant that solves complex TV UI challenges like D-pad navigation and focus management.
clstk.com
October 20, 2025 at 12:55 PM
Adapting React for TV brings unique UI challenges like focus management & D-pad navigation. In this talk, Amazon’s Eric Fahsl demos Kiro.dev, a spec-driven AI assistant that turns prompts into structured tasks to solve these problems predictably ➡️ clstk.com/4o2XDLI
Why build 18 separate TV apps when you can build one? Learn how to scale without scaling your team in @lukasz.app’s article, which is a preview of the upcoming TV Guide 2026 co-authored with Amazon 📖 clstk.com/3IQ9Y6J
Cross-Platform TV Apps with React Native for tvOS, Android TV, and Tizen
Learn why React Native is a powerful choice for TV app development. Discover how it unifies development for tvOS, Android TV, Tizen, and more with a single codebase.
clstk.com
October 17, 2025 at 10:52 AM
Why build 18 separate TV apps when you can build one? Learn how to scale without scaling your team in @lukasz.app’s article, which is a preview of the upcoming TV Guide 2026 co-authored with Amazon 📖 clstk.com/3IQ9Y6J
During September AI Meetup, @szymonrybczak.bsky.social unpacked the architecture of on-device LLM inference in React Native. Now the recording is live. Watch it & find out how we built React Native AI using the AI SDK to integrate with MLC LLM Engine and Apple's foundation models: clstk.com/4okrZJ8
React Native AI: Bringing On-Device LLMs With AI SDK | Callstack
Need offline AI in your mobile app? This talk recording demonstrates how to use the AI SDK to create a custom provider for on-device LLMs in React Native, ensuring privacy and functionality anywhere.
clstk.com
October 16, 2025 at 6:44 AM
During September AI Meetup, @szymonrybczak.bsky.social unpacked the architecture of on-device LLM inference in React Native. Now the recording is live. Watch it & find out how we built React Native AI using the AI SDK to integrate with MLC LLM Engine and Apple's foundation models: clstk.com/4okrZJ8
Reposted by Callstack
🎉 Introducing React Native Harness - a lightweight framework for testing native modules directly on device or emulator.
Write tests in a Jest-like syntax, run them in a real React Native runtime, and verify native behavior without mocks.
Write tests in a Jest-like syntax, run them in a real React Native runtime, and verify native behavior without mocks.
October 15, 2025 at 1:59 PM
🎉 Introducing React Native Harness - a lightweight framework for testing native modules directly on device or emulator.
Write tests in a Jest-like syntax, run them in a real React Native runtime, and verify native behavior without mocks.
Write tests in a Jest-like syntax, run them in a real React Native runtime, and verify native behavior without mocks.
NFL engineering moves fast because kickoff and the Super Bowl don’t wait 🏈 On React Universe On Air, @grabbou.com and Michael Blanchard share how the NFL ships RN across mobile, web, and TV: GitHub Actions + Expo Build, 20–30 PRs daily, Expo SDKs.
Watch + resources ➡️ clstk.com/4nSz5Fd
Watch + resources ➡️ clstk.com/4nSz5Fd
NFL’s React Native at Scale: Web, Mobile, TV
Discover how the NFL uses React Native, Expo, and a monorepo to ship apps across iOS, Android, web, and TV with one stack.
clstk.com
October 14, 2025 at 11:17 AM
NFL engineering moves fast because kickoff and the Super Bowl don’t wait 🏈 On React Universe On Air, @grabbou.com and Michael Blanchard share how the NFL ships RN across mobile, web, and TV: GitHub Actions + Expo Build, 20–30 PRs daily, Expo SDKs.
Watch + resources ➡️ clstk.com/4nSz5Fd
Watch + resources ➡️ clstk.com/4nSz5Fd
What does it take to keep NFL fans connected on every screen (iPhones, Xboxes, TVs, and more) every game day? @grabbou.com chats with Michael Blanchard (Director of Engineering at #NFL) about scaling React Native across every surface. Set a reminder for the premiere on October 14 📅
October 10, 2025 at 9:13 AM
What does it take to keep NFL fans connected on every screen (iPhones, Xboxes, TVs, and more) every game day? @grabbou.com chats with Michael Blanchard (Director of Engineering at #NFL) about scaling React Native across every surface. Set a reminder for the premiere on October 14 📅
Still wrestling with generic tools for your dev workflow? It's time to build your own.
In this talk from our AI Meetup, @raf.dev shows you how to create custom, AI-powered tools like a personal slide generator with React and an AI dev notebook with Astro ➡️ youtu.be/MWGeGtIhf7o?...
In this talk from our AI Meetup, @raf.dev shows you how to create custom, AI-powered tools like a personal slide generator with React and an AI dev notebook with Astro ➡️ youtu.be/MWGeGtIhf7o?...
AI for the Other Parts of Your Technical Job by Rafael Mendiola | AI Meetup, Wrocław, September 2025
YouTube video by Callstack
youtu.be
October 9, 2025 at 8:16 AM
Still wrestling with generic tools for your dev workflow? It's time to build your own.
In this talk from our AI Meetup, @raf.dev shows you how to create custom, AI-powered tools like a personal slide generator with React and an AI dev notebook with Astro ➡️ youtu.be/MWGeGtIhf7o?...
In this talk from our AI Meetup, @raf.dev shows you how to create custom, AI-powered tools like a personal slide generator with React and an AI dev notebook with Astro ➡️ youtu.be/MWGeGtIhf7o?...
Reposted by Callstack
Last year, we proved that React Native is a great fit for Vision Pro. For React Conf 2025, we’re doing the same for @MetaQuestVR. We built a showcase app to show how React Native scales to VR platforms, and the results speak for themselves!
Check out what we did on our blog👇
Check out what we did on our blog👇
October 8, 2025 at 1:41 PM
Last year, we proved that React Native is a great fit for Vision Pro. For React Conf 2025, we’re doing the same for @MetaQuestVR. We built a showcase app to show how React Native scales to VR platforms, and the results speak for themselves!
Check out what we did on our blog👇
Check out what we did on our blog👇
We just launched a new React Native showcase for Meta Quest VR 🚀
Our demo on Horizon OS features camera, audio, and fluid navigation powered by popular libraries. It proves you can use existing mobile skills to build high-performance VR experiences.
Read the full story by @jwr.ski on our blog ⬇️
Our demo on Horizon OS features camera, audio, and fluid navigation powered by popular libraries. It proves you can use existing mobile skills to build high-performance VR experiences.
Read the full story by @jwr.ski on our blog ⬇️
October 8, 2025 at 12:39 PM
We just launched a new React Native showcase for Meta Quest VR 🚀
Our demo on Horizon OS features camera, audio, and fluid navigation powered by popular libraries. It proves you can use existing mobile skills to build high-performance VR experiences.
Read the full story by @jwr.ski on our blog ⬇️
Our demo on Horizon OS features camera, audio, and fluid navigation powered by popular libraries. It proves you can use existing mobile skills to build high-performance VR experiences.
Read the full story by @jwr.ski on our blog ⬇️
At React Conf this week? Let's talk about the future of the ecosystem.
The Callstack team is just outside the Casablanca Ballroom. Drop by to discuss where React is heading and take our React Maturity Survey to see how your app can lead the way.
The Callstack team is just outside the Casablanca Ballroom. Drop by to discuss where React is heading and take our React Maturity Survey to see how your app can lead the way.
October 7, 2025 at 8:32 PM
At React Conf this week? Let's talk about the future of the ecosystem.
The Callstack team is just outside the Casablanca Ballroom. Drop by to discuss where React is heading and take our React Maturity Survey to see how your app can lead the way.
The Callstack team is just outside the Casablanca Ballroom. Drop by to discuss where React is heading and take our React Maturity Survey to see how your app can lead the way.
The future of React and React Native is now stewarded by the new React Foundation and Callstack is a founding member.This milestone ensures the long-term stability of the core infrastructure and a neutral, collaborative home for the ecosystem you rely on.
Press releases below ⬇️
Press releases below ⬇️
October 7, 2025 at 5:38 PM
The future of React and React Native is now stewarded by the new React Foundation and Callstack is a founding member.This milestone ensures the long-term stability of the core infrastructure and a neutral, collaborative home for the ecosystem you rely on.
Press releases below ⬇️
Press releases below ⬇️
We’re so excited to be co-hosting React Conf again this week!
Find us at:
- Callstack booth (main hall)
- “React Everywhere: Bringing React Into Native Apps” by @grabbou.com, Oct 8, 2:05PM
- “What’s the Framework of the React Future?” panel with @thymikee.bsky.social, Oct 8, 4:20PM
👉 conf.react.dev
Find us at:
- Callstack booth (main hall)
- “React Everywhere: Bringing React Into Native Apps” by @grabbou.com, Oct 8, 2:05PM
- “What’s the Framework of the React Future?” panel with @thymikee.bsky.social, Oct 8, 4:20PM
👉 conf.react.dev
React Conf 2025 | October 7-8 | Henderson, Nevada & online | Join us!
conf.react.dev
October 6, 2025 at 1:12 PM
We’re so excited to be co-hosting React Conf again this week!
Find us at:
- Callstack booth (main hall)
- “React Everywhere: Bringing React Into Native Apps” by @grabbou.com, Oct 8, 2:05PM
- “What’s the Framework of the React Future?” panel with @thymikee.bsky.social, Oct 8, 4:20PM
👉 conf.react.dev
Find us at:
- Callstack booth (main hall)
- “React Everywhere: Bringing React Into Native Apps” by @grabbou.com, Oct 8, 2:05PM
- “What’s the Framework of the React Future?” panel with @thymikee.bsky.social, Oct 8, 4:20PM
👉 conf.react.dev
At @reactuniverseconf.com, @lukasz.app talked with Joel Arvidsson, @jayz.us, and Thibault Malbranche. They covered React Native stability desktop apps, tooling gaps, and what 1.0 should mean.
Watch and explore show notes at clstk.com/48uIpKi
Watch and explore show notes at clstk.com/48uIpKi
September 19, 2025 at 12:02 PM
At @reactuniverseconf.com, @lukasz.app talked with Joel Arvidsson, @jayz.us, and Thibault Malbranche. They covered React Native stability desktop apps, tooling gaps, and what 1.0 should mean.
Watch and explore show notes at clstk.com/48uIpKi
Watch and explore show notes at clstk.com/48uIpKi
One of the most common errors in React Native development on Android is “Unable to load script”.
We put together a clear troubleshooting guide covering Metro, ports, and network configs to help you solve the issue quickly ➡️ clstk.com/47N2Ody
We put together a clear troubleshooting guide covering Metro, ports, and network configs to help you solve the issue quickly ➡️ clstk.com/47N2Ody
September 16, 2025 at 3:09 PM
One of the most common errors in React Native development on Android is “Unable to load script”.
We put together a clear troubleshooting guide covering Metro, ports, and network configs to help you solve the issue quickly ➡️ clstk.com/47N2Ody
We put together a clear troubleshooting guide covering Metro, ports, and network configs to help you solve the issue quickly ➡️ clstk.com/47N2Ody
In Prague next week? Catch Szymon Chmal at The Spark as he breaks down how he hacked React Native DevTools. No forks needed.
📅 Sept 16, 6–10 PM, Prague, Czech Republic
➡️ guild.host/events/the-s...
📅 Sept 16, 6–10 PM, Prague, Czech Republic
➡️ guild.host/events/the-s...
The Spark | Guild
Sep 16th 6:00PM: ## Hey React Prague Community!
Join us for an evening of learning, sharing, and connecting with the vibrant React and Reac
guild.host
September 11, 2025 at 7:53 AM
In Prague next week? Catch Szymon Chmal at The Spark as he breaks down how he hacked React Native DevTools. No forks needed.
📅 Sept 16, 6–10 PM, Prague, Czech Republic
➡️ guild.host/events/the-s...
📅 Sept 16, 6–10 PM, Prague, Czech Republic
➡️ guild.host/events/the-s...