Mobile AI Lab. We train specialized models & build tools for agentic mobile development: @apex__ai + @agent_device. Hosting @AgentConf. React Native experts.
Wroclaw, Poland
Joined August 2016
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Callstack Engineers retweeted
React Native 0.88 is now available!
This release switches to a web-based event dispatching model, adds variable fonts support, SceneDelegate on iOS, and ArrayBuffer support for Android TurboModules. And it's another non-breaking major release.
reactnative.dev/blog/2026/10…
Callstack Engineers retweeted
SDK 58 is out 🙌
This SDK is built for iOS 27. Apps on SDK 58 will be ready for Duo on day one 📖.
The release also includes App Intents for Siri, 2x faster clean Android builds, faster Expo modules, and a CLI built for your coding agent.
Changelog: expo.dev/changelog/sdk-58
Upgrade: 𝚗𝚙𝚡 𝚎𝚡𝚙𝚘 𝚒𝚗𝚜𝚝𝚊𝚕𝚕 𝚎𝚡𝚙𝚘@^𝟻𝟾.0.0 --𝚏𝚒𝚡
Callstack Engineers retweeted
react-native-arrangement-view 0.4.0 is out 🧩
→ New
Callstack Engineers retweeted
We’re at Vercel Ship 26 in SF with @callstackio. Reach out if you’re in town and want to grab a coffee and talk about agentic infra
Callstack Engineers retweeted
agent-device just crossed 1M monthly downloads and 5k stars! 🎉
I have so much fun shipping this project to you, learning new things every day. hope you find it helpful
Callstack Engineers retweeted
Who's testing the code your agents write? @SzymonRybczak of @TesterArmy explains AI testing for web and mobile apps, including test plans built around each pull request.
Callstack Engineers retweeted
We trained Apex for React Native. It landed #2 at fixing web React.
Callstack's Apex is tied #5 overall on @aidenybai's ReactBench. React Native tuning carries over to the web.
Try it on Vercel AI Gateway or apex.callstack.com
Callstack Engineers retweeted
There’s a cheap coding model that’s SOTA in React Native and Next.js available on AI Gateway.
It’s called Apex.
vercel.com/ai-gateway/models…
Callstack Engineers retweeted
First model from Poland on Vercel AI Gateway. Let's go @callstackio! 🇵🇱
vercel.com/ai-gateway/models…
Callstack Engineers retweeted
Introducing Mobile Dev: full mobile dev tooling right in your Codex app ✨
Callstack Engineers retweeted
Mobile dev tooling inside Codex ✨
📱 iOS and Android previews, side by side
✏️ Annotations to show your agent what to change
📈 Performance profiling and comparisons
📱 iOS, Android (native), React Native and more...
One plugin. More features coming. Powered by @agent_device (as always)
Try it out 👇
Callstack Engineers retweeted
Celebrating @callstackio’s APEX launch! 🎉
I connected APEX to my Vault Terminal (callstack.com/blog/building-…) for some classic RPG gaming. 🎮
@OpenAIDevs has Codex × @modretro Chromatic.
We have @apex__ai × Vault. 😎
Still an early prototype (only one piece exists 😅).
Small company, big heart and even bigger ambitions! ❤️
Callstack Engineers retweeted
Callstack is giving 50 people $50 each in Apex API credits to celebrate its launch! ⚡
To enter, reply below with what you're building, or something you'd like to build with Apex! We will choose winners in 24 hours.
Announcing Apex: agentic coding model for mobile and web, specialized in React.
We built Apex from a single idea: can an open-weight model deliver frontier-level performance at lower cost?
Yes. Apex is SOTA in React Native and Next.js.
Try it now: apex.callstack.com
Callstack Engineers retweeted
e2e ⨯ @apex__ai
Introducing e2e
The agentic testing framework for any app
~/ npx e2e init
→ Fully Open Source
→ Mix deterministic and agentic APIs
→ Supports web, mobile, and more
→ Bring your own agent and infrastructure
→ Run locally or in CI
tester.army/e2e
Callstack Engineers retweeted
Woow cool finally an AI model made for RN 🔥
Congrats on the launch 🚀
Announcing Apex: agentic coding model for mobile and web, specialized in React.
We built Apex from a single idea: can an open-weight model deliver frontier-level performance at lower cost?
Yes. Apex is SOTA in React Native and Next.js.
Try it now: apex.callstack.com
Callstack Engineers retweeted
we really care about giving you a fast model. spent a lot of effort to make it so. thank you @modal for making it easier!
Callstack Engineers retweeted
Lfg 🚀 .
Time to ship cool things with @apex__ai by @callstackio 👀
Announcing Apex: agentic coding model for mobile and web, specialized in React.
We built Apex from a single idea: can an open-weight model deliver frontier-level performance at lower cost?
Yes. Apex is SOTA in React Native and Next.js.
Try it now: apex.callstack.com
Callstack Engineers retweeted
Apex is now generally available through API access.
It's a coding model specialized in mobile and web development. Especially good with React Native and React apps.
Sign up at apex.callstack.com
Announcing Apex: agentic coding model for mobile and web, specialized in React.
We built Apex from a single idea: can an open-weight model deliver frontier-level performance at lower cost?
Yes. Apex is SOTA in React Native and Next.js.
Try it now: apex.callstack.com
Callstack Engineers retweeted
We believe in domain-specific models and domain-specific harnesses. At Callstack, we've been investing in both.
Excited to bring you the first piece of a broader family we're building. More to come!
Announcing Apex: agentic coding model for mobile and web, specialized in React.
We built Apex from a single idea: can an open-weight model deliver frontier-level performance at lower cost?
Yes. Apex is SOTA in React Native and Next.js.
Try it now: apex.callstack.com