PURE
PURE (Pure Understanding of Real Economics) is an offline-first budgeting app built around a hard rule: zero data collection. Transactions, budgets, savings goals and analytics are computed and stored entirely on-device, with optional biometric lock. The only network calls it ever makes are for ad delivery and live currency rates.
- Type
- Mobile App
- Role
- Solo developer & designer
- Built
- 2025
- Updated
- 2025
- Tech stack
- FlutterDartLocal storageBiometricsAdMob
The constraint
Most budgeting apps earn their money from the data you hand them. PURE was built the other way round: there is no account, no sync and no server, so there is nothing to leak and nothing to sell. Every figure on screen is computed on the device from data that never leaves it.
What that costs you
Offline-first means no cloud backup to fall back on, so export had to be a first-class feature rather than a settings-screen afterthought. Data lives in local storage, can be exported to a file on demand, and can be wiped entirely from inside the app.
The two exceptions
The app touches the network exactly twice: to serve ads, and to refresh currency rates for the converter. Neither call carries personal or financial data. Sensitive screens sit behind optional biometric or PIN lock.
Surface area
Transactions with custom categories and recurrence, budgets with threshold alerts, savings goals with progress tracking, spending analytics, bill reminders, and calculators for loans, currency and retirement — in both a light and a dark theme.