Karol Binkowski

Software engineer & builder. You have something. I ship it. 🚢 RN · Next.js · Python. Building & · Open to B2B

[Karol Binkowski @grzywn]

upload a video ➡️ AI picks the best frames from it

thumbnails, profile pictures, story shots — all from a single video

works in your browser, no account required

👉 https://t.co/qsIHXS4B5D

[Karol Binkowski @grzywn]

Nobel laureate John Jumper just left DeepMind for Anthropic 🏃‍♂️

The guy who cracked protein folding is walking after 9 years — right as Google struggles to sell coding tools.

Talent is voting with its feet.

[Solopreneur Dad @JonBuildsHQ]

I created this tool to grow faster on X.

Is this cheating? 😂

Should I release this to the public?

[probiex007 @probiex007]

🤯 This is a website, a simple web-based game built with WebGL and Three.js.
Website: https://t.co/G0cDgaWzKe
It's honestly surprising how far web development has come.

[Karol Binkowski @grzywn]

And now y'all have Claude Max plan without Fable, well... 💀

I'm glad I didn't impulse buy it lol

[Anthropic @AnthropicAI]

The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees.

The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.

Access to all other Claude models is not affected.

We apologize for this disruption to our customers. We believe this is a misunderstanding and are working to restore access as soon as possible.

Read our full statement: https://t.co/bwn0sximKZ

[Karol Binkowski @grzywn]

to FOMO or not to FOMO with Fable? 😩

[Oscar Franco @ospfranco]

A new version of op-sqlite is coming with a performance improvement in string conversion. If you are passing a lot of strings JS → JSI then you might see quite a perf boost

Based on the work of @grzywn

Links below

[Karol Binkowski @grzywn]

@ospfranco Happy I could help, big kudos 👏

[Karol Binkowski @grzywn]

From a JSI Training Task to 3 Open Source Contributions and a 310× Base64 Speedup

3 merged PRs to @craftzdog's react-native-quick-base64.

Plus a free JSI Cheatsheet.

👇
https://t.co/gknf94OSso

[Karol Binkowski @grzywn]

@latekvo i like how you use arch btw 🗿

[Karol Binkowski @grzywn]

See how you can use agents in your work. Lots of timeless insights and tips you can put into practice right away 🤖

[Software Mansion @swmansion]

Everyone makes mistakes, but we grow quickly from them 🏎️
We gathered everything we've learnt about agentic engineering in one place - it's a must-read if you're shipping with agents: 

🤖 https://t.co/zTC2yPslg5

[Software Mansion @swmansion]

We built a tool that lets Claude Code autonomously test your entire mobile app.

It navigates your app, opens screens, reads the debug logs, finds performance problems, and hands you a structured report.

All it takes is one prompt.

[Karol Binkowski @grzywn]

If you are still waiting for your agent to do its work, spin up another one 🙌

Really powerful using Claude with worktrees or Github Copilot Agents tab 😁

[Software Mansion @swmansion]

3 Claude agents ➡️ 3 open-source libraries ➡️ 1 week.

@blazejkustra_  ran 3 Claude agents in parallel for a week and shipped 3 open-source React Native libraries. Not one at a time. All three. In one week. 

This is how we ship at @swmansion, so if you're building something hard, you know where to find us. 📩

And if you want to read more about Błażej's workflow, check the comments:

[Karol Binkowski @grzywn]

Happy to contribute to react-native-quick-base64 🙌

JSI optimizations and a SIMD optimized algorithm made it much faster, especially for bigger conversions.

Check the new release down below 👇

[Takuya 🐾 devaslife @inkdrop_app]

just released [email protected]. It is roughly 2-3x faster than v2. Kudos to @grzywn!
https://t.co/G6lnN2ZTBd

[Tomasz Zawadzki @tomekzaw_]

Huge success @craftzdog and @grzywn 👏👏👏

[Tomasz Sapeta 𝝠 @tsapeta]

Really proud of this release 🥹 The changelog only has a small blurb on the iOS native modules, but it was a huge rewrite — Swift now talks to JSI directly via Swift/C++ interop, no more Objective-C++ middle layer. Fewer language boundaries to cross, less overhead, faster calls ⚡️

Full write-up coming soon.

[Karol Binkowski @grzywn]

@vlavuc I use already collected and exported .gpx data, so I don't track the movement myself 😄

[Karol Binkowski @grzywn]

I built Strava-style route animation using RN Skia 🎨 and Reanimated 4 🐎

In just 10 seconds, see your route and where you ran faster or slower — all from a GPX file.

GPX coordinates → smooth pace-accurate motion. Lots of math.

See it yourself below 👇

[Karol Binkowski @grzywn]

@maazscript Yeah 👉 https://t.co/2fDXAO9fdG

[Karol Binkowski @grzywn]

@DaehyeonMun Thank you! It calculates positions for each tile and creates background in a similar way like Leaflet does. Then it's overlayed using React Native Skia canvas, which draws and display the path on the map based on precalculated point coordinates in a time-series 😁