Compounder - The Interest Tool
Compound interest calculations
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Compounder — The Compound Interest Calculator
Compound interest is the most powerful force in personal finance. Compounder shows you exactly what it means for your money.
GROWTH CALCULATOR
Enter your starting balance, annual return rate, and how long you're investing. Add a periodic contribution and compound frequency to fine-tune the projection. Watch a number you recognise turn into one that doesn't feel real.
WITHDRAWAL CALCULATOR
Got a pot? Find out how long it lasts. Set a withdrawal amount, inflation rate, and frequency — and see the year your savings run out (or don't).
CHARTS & YEARLY VALUES
Visualise your growth curve or see every single year mapped out. Useful for planning. Mildly addictive for everyone else.
TERMINOLOGY GUIDE
Every field explained, clearly. No jargon, no assumptions.
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Compounder is free to use. Remove ads and help the developer with a one-time purchase to unlock the full experience.
Part of the FiHub app family — alongside Rewirement (in-depth retirement planning) and Stocker (simplified stock analysis).
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
AdMob fixes
The developer, NICHOLAS IAIN MULLEY, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Location
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- NICHOLAS IAIN MULLEY
- Size
- 15.1 MB
- Category
- Finance
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- Compounder UK $1.99
- Copyright
- Copyright © 2026 Compounder. All rights reserved.