Hypothetically: Compound Calc
Interest & Return Calculator
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Drag through the chart and watch your money grow, year by year. Every “what if” answered instantly — no sign-up, no clutter.
What if $1,000 grew 10% a year for 20 years?
Hypothetically answers before you finish typing. There's no calculate button — every digit you change redraws the whole curve live.
DRAG THE CHART. Scrub across it to read your balance at any point in time. Every period you cross taps back, and milestones tap harder. You feel the timescale without looking away from the number.
NUMBERS THAT ROLL. Values travel to their new total like an odometer instead of snapping. Same answer, better to watch.
FOUR INPUTS, ONE SCREEN. A starting amount. A rate — percent or fixed dollars, positive or negative, so you can model a loss as easily as a gain. How often it compounds: trading day, day, week, month or year. And an optional recurring deposit on its own schedule.
TRY TO BREAK IT. Put in 40% per trading day over twenty years. The number keeps up — cents, then millions, then billions, then scientific notation. Nothing overflows, nothing rounds to nonsense.
1W TO 20Y. Jump from one week to two decades with a tap. Same inputs, redrawn instantly.
PRO. Terminal is free. The Pro purchase adds Vault (navy and gold), Ledger (paper and ink) and Arcade (pixel font, all caps), and removes ads for good. No subscription, ever.
No account, no sign-up. The free version shows a short ad when you open the app (only after two days) and a small banner at the bottom during use.
Hypothetical — not a forecast. Nobody knows what markets will do. This shows you what the math does.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Performance enhancements and minor UI refinements to keep your compound calculations fast and smooth.
The developer, Mohammad Al Rebh, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mohammad Al Rebh
- Size
- 5.7 MB
- Category
- Finance
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Pro $4.99
- Copyright
- © 2026 Mohammad Al Rebh