Patrik Dörfler
I design apps,
then I build them.
Seventeen, from Hungary. Eight apps so far: one on the App Store, one that four people talk through every day, and one that won Hungary’s national science olympiad and took me to the EU final in Kiel.
helobelo
Seven conversations with one person. At the same time.
A messenger where every topic gets its own thread, so the trip, the dog and the serious stuff never get in each other’s way. iPhone and Mac.
For people who’d rather text than call, and text one person all day.
The problem. One endless chat buries the thing that mattered under the thing that didn’t.
Proof. Four people run their conversations on it every day. 332 commits in 82 days, twenty backend functions, and a 2.0 with real accounts coming to iPhone and Mac.
LogicLab Kids
Thinking first. Then TikTok.
A reasoning app for 7–11-year-olds. Every finished lesson earns screen time, and iOS itself unlocks the apps the parent picked. The AI tutor is only allowed to ask questions.
For parents of 7–11-year-olds who are tired of being the screen-time police.
The problem. On a tram I heard a ten-year-old tell his dad that ChatGPT did his homework in minutes. Blocking apps doesn’t fix that; it only teaches kids to resent the block.
Proof. Before launch I sent a sign-up page to the parents at my school: 431 opened it, 206 left an email, 48 signed up to pay. It won the national final of the 35th OTIO, Hungary’s science and innovation olympiad, and represented Hungary at EUCYS 2026 in Kiel.
Headroom
It tells you what to do today to get paid.
A coach for solo developers with a side project. It plans your day around code, selling and learning, watches your real signups and revenue, and calls you out when you’ve coded all week and sold nothing.
For solo developers with a side project and no paying users yet.
The problem. Building feels like progress. A week of commits without asking anyone to pay is a week lost.
Where it is. The waitlist is open. It’s my entry for the 36th OTIO.
Cadence
Your timetable, typed in by nobody.
Screenshot the school timetable. Cadence reads the grid, you check it once, and the whole year lands in Apple Calendar as weekly events.
For every student who retypes forty lessons into a calendar each September.
The problem. School systems export a picture, not a calendar.
Proof. First commit at 18:54, ready for TestFlight at 21:35. Its first real test read my KRÉTA timetable, 34 lessons, without a mistake.
LogicLab
An AI that refuses to give you the answer.
Everyone builds AI that answers. LogicLab argues back, so the thinking stays yours. Debate a philosopher, and hear your logical fallacy named the moment you commit it.
For teenagers and adults who noticed they stopped thinking things through.
The problem. Every AI product is optimised to do the thinking for you.
Proof. 198 commits, built alone. The idea won the OTIO regional final in Veszprém and grew into LogicLab Kids.
AFK
My coding agents text me when they’re done.
An iPhone app wired into Claude Code. The agent finishes, my phone buzzes with what it did and a screenshot, I answer from the lock screen, and the same session on my Mac wakes up and keeps going.
For anyone running AI agents for longer than they want to sit and watch.
The problem. An agent that waits for you at a desk is an agent that waits.
Proof. I’ve used it every day since September. From the phone I can also start a new session, switch its model, or see how far along it is.
EV Cost
Is the electric car actually cheaper? I was fifteen and wanted to know.
Type a distance. EV Cost shows what the trip costs on petrol, what it costs on electricity, and the CO₂ you didn’t emit, counted in trees.
For anyone standing in a dealership doing maths on their phone.
The problem. Fuel and charging prices are quoted in units nobody compares.
Proof. My first app, on the App Store since 14 January 2025 in English, German and Hungarian. Free, no ads, no account, rated 5.0 in Hungary.
EcoMode
Points for taking the train.
Start a trip, pick how you’re travelling, stop. Every green kilometre earns points, weighted by how you moved, and the points buy gift cards in the shop.
For students who would take the bus if it paid.
The problem. The cheaper, greener trip has no reward you can feel today.
Proof. I designed it and built it in Flutter with two classmates, as team PandoWeb. Thirteen ways to travel, ten languages.
Product & tech intern
Since May 2026
Say hello.
Designed and built by me, in Hungary. No frameworks, no trackers.