Compounder vs Compound Interest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Compounder
Calculate the growth of savings and investments using compound interest. Explore how regular contributions and withdrawals impact your financial goals over time. Designed for anyone to understand and utilize the power of compounding for wealth building.
- Calculate compound interest
- Flexible settings
- Factor in periodic withdrawals
- Factor in additional contributions
- Easy-to-use interface
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Compounder lets you easily calculate the power of compound interest to reach your financial goals—whether for savings, investments, or retirement planning. What is compound interest? Compound interest is the interest calculated on both the initial principal and the accumulated interest from previous periods. This powerful tool can make a big difference over time! Example: Imagine starting with $1,000 in savings, contributing $500 monthly at an 11% annual return. After 40 years, that account could grow to $4.38 million! Even small, regular contributions—like the average American car payment—can build lasting wealth. Features: Quickly calculate compound interest with flexible settings. Factor in periodic withdrawals or additional contributions to see how they affect your growth. Easy-to-use interface, designed for anyone wanting to understand and harness compound interest, without needing a finance background. You don’t need to be a Wall Street broker to become a millionaire. Start planning your financial future with Compounder today!
Compound Interest
Calculate and visualize the growth of your savings and investments over time. Explore different scenarios to understand the power of compound interest and plan for your financial goals, such as retirement.
- Visualize savings growth with interactive graphs
- Calculate required contributions for financial goals
- Experiment with different saving scenarios
- Flexible calculations for balance, contribution, or time
- Link tabs for complex strategy comparisons
- Customizable light and dark themes
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Unlock the Power of Compound Interest: See Your Money Grow Over Time Ever wondered how much your savings could grow if you started investing today? With Compound Interest, you can instantly see the impact of saving and investing on your future wealth. Start Saving Early and Watch Your Money Grow What if you started saving for retirement at just 15 instead of 40? By contributing just $100 a week with a 7% return, you could accumulate over $2 million by the time you retire. You may wonder: "How is that possible when I’m only saving $260,000?" The answer lies in the power of compound interest. While your direct savings would total just over $250,000, the additional $2 million comes from the growth of your investments over time. Impressive, right? Reach Your Retirement Goals with Ease Already have a target in mind? You can easily adjust the settings to calculate your required contribution, desired return rate, or even the time frame needed. For example, if your goal is to retire with $5 million but you're unsure how much to save each month, simply switch to the "solve for contribution" mode, and the app will automatically calculate the amount you need to save to reach your goal. Key Features: Visualize Your Future: Easily calculate how your savings or investments could grow over the next 30 years (or more) with interactive graphs that break down your gains year by year. Plan for Your Goals: Want to retire a millionaire? Set your target goal, and let the app calculate how much you need to save each month, the return rate, or how long it will take to get there. Experiment with Different Scenarios: Test different saving strategies with the option to create multiple tabs. Try saving $100/week for 10 years, then adjusting your contributions—see the real impact of compound interest! Flexible Calculations: Whether you're solving for total balance, contribution amount, return rate, or investment length, Compound Interest makes it easy to adjust your plan and reach your financial goals. Advanced Tab References: Link one tab's balance to another for more complex calculations. Want to try saving more for a few years and less later? It's easy to reference and compare different strategies. Customizable Themes: Switch between light and dark modes to suit your style. Why You'll Love It: See exactly how compound interest works and how small changes in saving habits can lead to huge financial gains. Perfect for retirement planning, saving for big goals, or simply exploring the magic of compounding. Simple, intuitive design for easy use no matter your financial knowledge. Start planning today, and watch your future wealth grow with Compound Interest!
Screenshots
Verdict
The clearest difference is price: Compounder at Free against Compound Interest's $1.99. Compounder also leads on update cadence (every 3 weeks vs every 4 months) and ratings volume (3.4K vs 238). Compound Interest's advantage is iOS requirement (14.0 vs 16.0). On rating, review sentiment, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Compounder is free to download; Compound Interest costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.8 for Compounder against 4.7 for Compound Interest. That said, the two scores are not equally well evidenced: Compounder has 3.4K ratings behind it against 238, so its average is the more settled of the two. Written reviews are what separate them: 60% of Compounder's written reviews are positive against 68% of Compound Interest's.
Compounder ships an update every 3 weeks, Compound Interest every 4 months. Both last shipped on September 22, 2026.
| Parameter | Compounder | Compound Interest |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 4.8 (3.4K ratings) — better | 4.7 (238 ratings) |
| Positive reviews | 60.0% of reviews | 67.7% of reviews — better |
| Number of ratings | 3.4K — better | 238 |
| Update frequency | Every 3 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | James Bevins | TernUp LLC |
Customer experience
Compounder
Compound Interest
User reviews
Compounder
From 3.4K App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Instant results
- 💡 Helps explain investments
- 🚀 Simple and easy to use
- 👍 Best and easiest compound calculator
Room to improve
- 🐛 Glitchy and not user-friendly after update
- 🐛 Can't use quarterly, monthly, or weekly buttons after update
- 🐛 New version not working well on iPhone
- 🐛 Can't click off of monthly to quarterly, yearly, or weekly
- 🐛 Compound frequency stuck on monthly after update
Compound Interest
From 238 App Store ratingsWhat we love
- 👍 Clean and simple design
- 🚀 Fast calculations
- 💡 Multiple tabs for different calculations
- ✨ Visually appealing interface
- 🚫 No obnoxious advertising
Room to improve
- 🐛 App freezes frequently
- 🐛 App crashes on interaction
- 🐛 iPad version broken
- 🐛 Cannot input numbers
- 🐛 Calculations are wrong
Bugs and requests
Compounder
Reported bugs
3 issues- Calculation issues with initial investment
- Formatting issues on mobile devices
- Crashes after short usage
Requested features
5 requests- Add percentage option for withdrawal
- Allow adjusting periodic contributions (weekly, monthly, etc.)
- Include daily compounding option
- Add inflation adjustment to contributions and outputs
- Create a widget version
Compound Interest
Reported bugs
8 issues- App keeps freezing
- App freezes when changing initial amount
- App crashes when tapping screen
- iPad version doesn't register changes
- iPad version resets starting balance to zero
Show 3 moreShow fewer
- Cannot input any numbers
- Calculations are wrong
- No function for withdrawals
Requested features
11 requests- Add annual lump sums
- Solve for required opening balance
- Save financial models with names
- Ability to adjust for months instead of years
- Enter length in months
Show 6 moreShow fewer
- Include savings withdrawal mode
- Option to see second and third graph showing +/- interest rate
- Name the tabs
- Custom-label each tab
- Ability to share calculations
- Option to change compound rate (daily, weekly, etc.)
In-app purchases
Compounder
No in-app purchases
Compound Interest
No in-app purchases
Questions
Is Compounder free?
Is Compound Interest free?
Which has better reviews, Compounder or Compound Interest?
Do Compounder or Compound Interest have ads?
Which is updated more often, Compounder or Compound Interest?
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