About Nummo
Nummo is an autonomous personal finance ledger built for Android and Web. It requires no sign-ups, connects to zero remote servers, contains zero telemetry or advertising SDKs, and stores all records locally on your device.
01. Philosophy & Why Nummo Exists
Most contemporary budget apps mandate remote account creation, scrape device SMS inboxes, request invasive permissions, and upload financial activity to multi-tenant cloud databases.
Nummo rejects this approach. It treats personal bookkeeping like a physical paper ledger or scientific calculator—a fast, reliable tool that opens instantly, works offline, and keeps your private financial records entirely on your device.
Core Guarantee: No backend servers, no user accounts, no external tracking. Your data never leaves your device.
02. Key Features
| Feature | Description | Status |
|---|---|---|
| Chronological Ledger | Credit and debit logging with automatic running balance calculations. | Offline |
| Math Keyboard | Built-in calculator keypad for computing splits, taxes, and bills inline. | Inline |
| Budget Targets | Overall or category-specific monthly spending limits with progress indicators. | Local |
| Visual Analytics | Historical spend trends, hourly distribution, and category breakdowns. | Local |
| Encrypted Backups | AES-GCM encrypted JSON backups with passphrase protection, plus CSV/PDF/Excel export. | Encrypted |
| Biometric Security | Salted PIN hashing and hardware biometric unlock via device TrustZone/Titan enclave. | Hardware |
| AMOLED Pure Black | True pitch-black #000000 theme along with Auto, Dark, and Light modes. | System |
03. Technical Architecture
- Framework: Built with Flutter and Dart using sound null safety.
- Local Persistence: Dual-write persistence with
shared_preferencesandflutter_secure_storage. - Document Synthesis: Client-side export formatting for PDF, Excel, and CSV with zero external services.
- Zero Sockets: The application contains no background HTTP sync tasks or tracking SDKs.
04. App Download & Distribution
| Platform | Distribution Channel | Link |
|---|---|---|
| Android | Google Play Store (Package: com.krajtilak.nummo) |
View on Google Play |
| Web (PWA) | Static Web Application | nummo.krajtilak.in |
| Android APK | GitHub Releases | Download APK |
05. Developer & Open Source
Nummo is engineered by K Rajtilak and is 100% open source. The complete codebase and commit history are publicly auditable.
- Developer Website: krajtilak.in
- GitHub Source: github.com/rajtilak-2020/Nummo
- Issue Tracker: github.com/rajtilak-2020/Nummo/issues