# I'm 12. I don't have a laptop. I built a full-stack AI SaaS on my Android phone.

> Source: <https://dev.to/koda2026/im-12-i-dont-have-a-laptop-i-built-a-full-stack-ai-saas-on-my-android-phone-2o2l>
> Published: 2026-08-22 13:45:41+00:00

Hi everyone! 👋

My name is Harun. I am 12 years old.

I don't own a laptop or a PC. My entire development environment is a **POCO C55 Android phone** and a free code editor called **Acode**.

Today, on my school holiday, I decided to stop watching tutorials and actually ship something. I built **KODA**, a full-stack AI coding mentor.

`llama-3.1-70b-versatile`

model for speed).Building on mobile is hard. The screen is small, and debugging is painful.

**1. The Mobile Viewport Trap:**

I used `height: 100vh`

for my app container. On desktop, it's fine. On mobile Chrome, the address bar hides part of the screen, pushing my input box off the bottom!

*The Fix:* I had to switch to `height: 100%`

on the `html, body`

and use `env(safe-area-inset-bottom)`

to glue the input area above the navigation bar.

**2. The Supabase RLS Silent Killer:**

My `profiles`

table was updating, but my `chats`

table was empty. No errors in the console.

*The Fix:* I realized RLS (Row Level Security) was blocking inserts because I hadn't granted permissions to the `authenticated`

role. I wrote a SQL script to `GRANT ALL ON public.chats TO authenticated`

and suddenly, the data started flowing.

My older brother (an engineering student) was my first beta tester.

He opened the app and typed: *"Vanakam da mapila"* (Hello friend/brother-in-law in Tamil).

When I teased him for treating the AI like a person, he replied: **"THAT'S MY FRIEND TEXTING YOU, IDIOT."** 😂

That was the moment I knew the product felt "alive."

I deployed it live on Netlify. It has multi-chat history, code syntax highlighting, and a "Panic" button that explains things "Like I'm 5."

**Live Link:** [koda-aicodementor.netlify.app](https://koda-aicodementor.netlify.app)

Since I am learning solo, I would love for senior developers to roast my code or tell me what to build next.

Thanks for reading my story!