# I'm 11, I built a Math App with Gemini & Vercel, and I need your Mobile UX advice!

> Source: <https://dev.to/jesse_otobo_/im-11-i-built-a-math-app-with-gemini-vercel-and-i-need-your-mobile-ux-advice-21bh>
> Published: 2026-06-28 09:56:56+00:00

Hello again, DEV Community!I recently shared my project, Jesse Math Rock Star, and the feedback from this community has been incredibly supportive.For those who don't know me, I am 11 years old. I started coding with Scratch when I was 8, and I built this production web app using self-explored vibe coding, Google's Gemini models (via AI Studio), and Vercel!Looking at my analytics, 61% of my visitors are using mobile phones, mostly Android. I want to make sure the app feels perfect and fun for kids my age to use on small touchscreens.Could you do me a quick favour?Open the app on your phone: [https://jesse-math-rockstar-app.vercel.app/](https://jesse-math-rockstar-app.vercel.app/) a quick round of math.Leave a comment below with your advice on the user interface (UI) and layout!Thank you all for being such a safe and helpful community for early-career builders! ([https://jesse-math-rockstar-app.vercel.app/](https://jesse-math-rockstar-app.vercel.app/))