Save money by logging what you didn't buy. No budget, no bank.
Keep the Diff is a savings tracker built around one subtraction: what you were ready to spend,
minus what you actually spent. The difference is your Diff, and it adds up week by week toward
the things you are saving for.
Use it for a no spend challenge, a no buy year or a low buy month, or simply to see how much
your better decisions add up to. A slip never resets your total, and there is no streak to lose.
- Log a Diff in seconds: what you planned to spend and what you spent
- Running totals by week, by month and across the year
- Savings goals with a photo, including a 52 week savings challenge
- "Not sure yet": park a purchase and decide later
- No budget to follow, no bank connection, no account needed, no ads
Logging is free. Premium adds end-to-end encrypted sync across your devices, full history,
CSV export, categories, unlimited goals, widgets and App Lock.