Colin

Founding Engineer, Wittiz, Inc.

[Colin @colin_developer]

@RicoDC95 Thanks, Eric! It took about 3 months to build. Happy to connect!

[Colin @colin_developer]

I built Wittiz 🏃 — a running app with a cute companion that cheers you on every kilometer, turns your runs into keepsake memories, and rewards you with jellies & collectibles.

GPT-5.6 was my co-pilot the whole way: cracking nasty React Native crashes, shaping features, and helping write copy in 3 languages. It turned "someday" into shipped.

Running should feel like joy, not just numbers. 💛
#wittiz #running

[Igor Furgała @exploif]

We have just released 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 𝐄𝐧𝐫𝐢𝐜𝐡𝐞𝐝 𝟎.𝟖.𝟎🚀

It comes with:
- text alignment
- improved web support
- numerous fixes and improvements
- and my favorite one – text shortcuts – automatic style detection as user types. Check it out below 👇

[Colin @colin_developer]

the whole loop in our running app:
🏃 go for a run
👕 dress up your character with what you earned
📸 save it as a memory — your pace, your avatar, your frame

run it. style it. keep it.

[Jay Meistrich @jmeistrich]

Legend List 3.0 is here! 🎉

✨ React DOM support
✨ Even faster, more stable
✨ Perfect initial scroll
✨ KeyboardAwareLegendList for chat and AI apps
✨ Reanimated item transitions
✨ So much more!

It’s been almost 1,000 commits since v2, super excited to finally release it!

[Colin @colin_developer]

@blazejkustra_ @swmansion is it out now?!

[Błażej Kustra @blazejkustra_]

Finally a bottom sheet library form @swmansion

A truly native performance, can’t wait to try it 🥳🕺

[Colin @colin_developer]

@expo I built the Wittiz running app with Expo, Claude Code, and Rive.

https://t.co/tJ9sLc7qNz

[Michał Pierzchała @thymikee]

working on a faster boot, interactions, and test replay for agent-device. so far:

→ 3.4x faster than baseline
→ 1.5x faster than Maestro (yes, we're adding compatibility layer)

shipping this in v0.15 once tested better

[Colin @colin_developer]

serve-sim has made building Wittiz, our running app, a lot easier.

Being able to simulate movement directly in the workflow has been super useful for testing running-related features.

Huge thanks to @Baconbrix for building this.

[Colin @colin_developer]

A pocket character built with React Native + Expo—tap interaction, motion reactions, quick outfit changes. @reactnative @expo