Doomo

Doomo turns your screen habits into the health of a virtual owl. Doomscrolling weakens him; reviewing your own study cards and completing small real-world quests helps both of you recover.

OpenAI Build Week track: Education — Doomo turns a student's own notes into focused study cards, schedules them with spaced repetition, and makes consistent learning emotionally visible.

Try it

Download the latest judge builds from GitHub Releases:

• Android phone: doomo-arm64-v8a-release.apk
• Android/Appetize emulator: doomo-x86_64-release.apk

Open Demo inside the app for sample usage and a starter study deck. Real screen-time reflection requires Android Usage Access and is best tested on a physical phone.

Current room

The current room makes study, rest, air, health, and resets part of Doomo's home instead of another dashboard.

What it does

• Reflects selected-app screen time through Doomo's health, mood, and room.
• Turns notes into concise GPT-5.6 study cards through a server-only endpoint.
• Reviews cards offline with FSRS spaced repetition.
• Offers small reset quests: study, drink water, or step outside.
• Keeps the core loop local; cloud voice and AI card generation are optional.

Tech stack

Layer	Technology
Mobile	Expo SDK 57, React Native 0.86, TypeScript
Android	Kotlin native module, UsageStatsManager
Experience	React Native Skia, Moti, Reanimated, DeviceMotion
Learning	GPT-5.6, FSRS, local lecture decks and imports
Storage	Expo SQLite
Optional voice	OpenAI Realtime over WebRTC
Server	Node.js 20, OpenAI Responses and Realtime APIs

Run locally

Requirements: Node.js 20+, JDK 17, Android Studio, and an Android emulator or phone.

git clone https://github.com/GitZohair/doomo-build-week.git
cd doomo-build-week\mobile
npm ci
npx tsc --noEmit
npm test
npx expo run:android

After the native client is installed, use Metro for fast iteration:

cd mobile
npx expo start --dev-client

The app works without an OpenAI key. For optional GPT-5.6 card generation and Realtime voice, run the server and keep the key there—never in the Android client:

cd server
npm ci
$env:OPENAI_API_KEY = "your-key"
$env:DOOMO_SAFETY_SALT = "a-long-random-secret"
npm start

How Codex and GPT-5.6 were used

Codex was the main engineering partner throughout the build: it helped turn the concept into the Android product, wire the native usage module, build the learning and room flows, debug Gradle/native dependencies, run tests, and produce verified ARM64 and x86_64 builds.

GPT-5.6 powers the notes-to-cards path. The server sends student notes to GPT-5.6 with a strict schema, validates the result, and imports the atomic cards into Doomo's offline FSRS review loop. No API key is shipped in the app.

Privacy

Screen-time history, health state, streaks, and card scheduling stay on-device. Camera quests are optional, and optional cloud features clearly require a user action.

Repository

This repository is publicly viewable for OpenAI Build Week judging. The project remains all rights reserved; see LICENSE. APKs are provided only as hackathon testing builds.