A gamified productivity app inspired by Jujutsu Kaisen's cursed energy system. Track your focus time vs leisure time using a dynamic balance mechanic that rewards consistent productivity.
The app uses Cursed Energy (CE) as a currency that rises when you focus (study/work) and falls when you take leisure (gaming/breaks). The goal is to maintain a positive CE balance to build streaks and unlock special abilities.
The central mechanic of the app. Your CE balance changes based on your activities:
| Activity | Effect |
|---|---|
| Focus Mode | +1.0 CE per minute (base rate) |
| Leisure Mode | -1.0 CE per minute |
Debt Penalties - When your balance goes negative:
| Debt Level | Focus Earning Rate |
|---|---|
| 0 to -5 CE | 1.0 CE/min (normal) |
| -5 to -10 CE | 0.5 CE/min (reduced) |
| Below -10 CE | 0.25 CE/min (heavily reduced) |
Streaks reward consistent productivity:
- How to earn: End the day with a higher CE balance than the previous day
- Streak counter: Shows consecutive days of positive progress
- Streak bonus: Earn 0.5 NCE per minute while focusing (only when streak > 0)
- RCT Credits: Every 3 streak days grants 1 RCT credit
NCE is a secondary resource earned only through streaks:
- Earning rate: 0.5 NCE per minute while focusing (requires active streak)
- Usage: Convert to positive CE using RCT (see below)
- Not affected by: Binding vows or debt level
A healing ability that converts NCE into positive CE:
- Requirement: 1 RCT credit + at least 1 NCE
- Effect: Converts all accumulated NCE into positive CE
- Credit source: Earned every 3 days of streak
RCT Button shows when: You have RCT credits available and NCE > 0
A high-risk, high-reward mechanic for escaping debt:
- Requirement: Must be in debt (negative CE)
- Limit: 1 vow per day
- Confirmation: Scary modal with acknowledgment checkbox
- Boosted earning rate: +0.5 CE/min added to base rate
- Grace time earned: 0.2 seconds per second of focus time
- Grace time protection: Leisure time consumes grace instead of CE
- Success: Clear your debt (reach CE ≥ 0) within 24 hours
- Bonus: Unused grace time converts to CE
- Penalty: Debt increases by MAX(original debt, current debt)
- Cooldown: Binding vow disabled for 6 hours
- Applied on: App load or during focus session
| State | Button Text | Subtitle |
|---|---|---|
| Available | "Sign Binding Vow" | "+0.5 CE/min boost..." |
| Used today | "Limit Reached" | "1 vow per day, come back tomorrow" |
| Penalty period | "Vow Recoiled" | "Available in HH:MM" (countdown) |
| Active | Shows timers | Grace Time + Time Left |
Daily sleep tracking that rewards rest:
| Hours Slept | CE Reward |
|---|---|
| 1-5 hours | +10 CE |
| 6-8 hours | +20 CE |
| 9+ hours | +15 CE |
- Modal appears: Once per day on app open
- Can dismiss: If you don't want to log
- Server time validated: Cannot be exploited by changing device time
The main screen displays:
- Status Pills: Streak days, NCE balance, RCT credits
- Balance Display: Current CE with earning rate indicator
- Session Timer: Active when focusing or in leisure (shows session + daily totals)
- Control Buttons: Focus / Leisure toggle buttons
- RCT Button: When available, shows conversion preview
- Binding Vow Widget: When in debt or vow active
In-app guide explaining game mechanics using Jujutsu Kaisen terminology:
- Cursed Energy (CE)
- Debt (The Curse)
- Streaks (Heavenly Gift)
- RCT (Purification)
- Binding Vows
Also includes Cursed History tab showing activity log.
The app uses server time validation to prevent device time manipulation:
- On app startup, fetches time from fast CDN endpoints (Google, Cloudflare)
- Calculates offset between device time and server time
- All time-sensitive calculations use server-adjusted time
- ✅ Daily streak calculations
- ✅ Sleep log (can't claim twice)
- ✅ Binding vow 24hr countdown
- ✅ Penalty period 6hr cooldown
- ✅ Daily counter resets
google.com/generate_204(~50ms)1.1.1.1/cdn-cgi/trace(~80ms)cloudflare.com/cdn-cgi/trace(backup)
client/
├── App.tsx # Root navigation setup
├── screens/
│ ├── DashboardScreen.tsx # Main productivity screen
│ ├── GrimoireScreen.tsx # Scriptures + History
│ ├── HomeScreen.tsx # Tab container
│ └── ProfileScreen.tsx # User profile
├── components/
│ ├── BalanceDisplay.tsx # CE balance with animation
│ ├── BindingVowWidget.tsx # Vow status + signing
│ ├── BindingVowConfirmModal # Scary confirmation modal
│ ├── ControlButton.tsx # Focus/Leisure buttons
│ ├── SessionTimer.tsx # Active session display
│ ├── SleepLogModal.tsx # Daily sleep input
│ ├── RCTButton.tsx # NCE conversion button
│ ├── StatusPill.tsx # Streak/NCE/RCT indicators
│ ├── CursedGuide.tsx # In-app guide modal
│ ├── CursedLog.tsx # Activity history modal
│ └── GlassCard.tsx # Glassmorphism card
├── hooks/
│ ├── useGameState.ts # Context wrapper
│ └── useGameStateInternal.ts # Core game logic
├── utils/
│ └── timeService.ts # Server time sync
└── constants/
└── theme.ts # Colors, spacing, typography
All game state is managed in useGameStateInternal.ts and persisted to AsyncStorage.
interface GameState {
balance: number; // Current CE
nceBalance: number; // Negative CE
streakDays: number; // Consecutive days
rctCredits: number; // Heal charges
vowState: VowState; // Binding vow status
totalStudySeconds: number; // All-time focus
totalGamingSeconds: number; // All-time leisure
dailyStudySeconds: number; // Today's focus
dailyGamingSeconds: number; // Today's leisure
logs: LogEntry[]; // Activity history
lastSleepDate: string | null; // Sleep tracking
lastBalanceDate: string | null;
lastBalance: number;
lastDailyResetDate: string | null;
}- Dark mode with purple/violet accents
- Glassmorphism effects on cards
- Smooth timing-based animations (Apple UI style)
| Token | Usage |
|---|---|
cursedEnergy |
Focus/positive states |
debt |
Negative balance, vow danger |
success |
Streaks, rewards |
textSecondary |
Muted text |
All animations use react-native-reanimated with withTiming and Easing functions (no spring bounce).
# Install dependencies
npm install
# Start Expo dev server
npm run expo:dev
# Or specific platform
npm run android
npm run ios# EAS Build (production)
eas build --platform android
eas build --platform ios