Comparison

Compounder vs Coast FIRE Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Calculate compound interest
  • Flexible settings
  • Factor in periodic withdrawals
  • Factor in additional contributions
  • Easy-to-use interface
Features
Read full description

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!

About

Coast FIRE Calculator

Features
Read full description

Ever wondered how much you need to invest today so your retirement nest egg grows on its own? The Coast FIRE Calculator helps you answer that question. “Coast FIRE” is a strategy within the FIRE (Financial Independence, Retire Early) movement that involves saving and investing enough early in life that, without further contributions, your portfolio will grow to fund retirement. Once you reach your Coast FIRE number, you can shift to work that covers only your current expenses while compound interest does the heavy lifting. Key Features: * Easy inputs: Enter your current age, target retirement age, desired retirement income, inflation assumptions and your preferred safe withdrawal rate. * Automatic Coast FIRE calculation: Instantly see your Coast FIRE number and the age at which you’ll hit it, based on your assumptions. * Scenario comparison: View default and slower‑growth scenarios to understand how varying investment returns change your path. * Year‑by‑year projections: Get a detailed table showing annual growth and portfolio balances from now until retirement. * Progress tracking: See your current progress toward your Coast FIRE number, both in today’s dollars and at retirement. * Save & manage calculations: Save multiple scenarios (e.g. “Coast at 30,” “Coast at 38,” “Coast at 40”) and revisit them later to track your progress. * Flexible retirement planning: Explore different retirement ages and income targets. Understand how changes in inflation, investment growth and withdrawal rates affect your nest egg. Coasting to financial freedom doesn’t mean quitting work entirely; it means knowing your future is secure so you can enjoy life on your own terms. Download the Coast FIRE Calculator to demystify your retirement goals and see if you’re on track for financial independence.

Screenshots

Compounder3 screens
Coast FIRE Calculator4 screens

Verdict

The call

The clearest difference is price: Compounder at Free against Coast FIRE Calculator's $4.99. Compounder also leads on rating (4.8 vs 1.0) and in-app purchases (none vs 1). Coast FIRE Calculator's advantage is update cadence (every 2 days vs every 3 weeks). On ads, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Compounder is free to download; Coast FIRE Calculator costs $4.99 up front. Coast FIRE Calculator sells 1 one-off in-app purchase. Compounder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Compounder holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Compounder has 4.3K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Compounder ships an update every 3 weeks, Coast FIRE Calculator every 2 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
Compounder versus Coast FIRE Calculator: the parameters behind the verdict, then further details
ParameterCompounderCoast FIRE Calculator
PriceFree — better$4.99
Rating4.8 (4.3K ratings) — better1.0 (1 ratings)
Positive reviews61.4% of reviews—
Number of ratings4.3K — better1
Update frequencyEvery 3 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.015.1 — better
Further details — not scored
Size3 MB30 MB
Age rating4+17+
DeveloperJames BevinsAtaraxia Labs

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

Coast FIRE Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Compounder

No in-app purchases

1 purchases

Coast FIRE Calculator

One-time1
  • Ad-Free Usage$8.99

Questions

Is Compounder free?
Compounder is free to download, with no in-app purchases.
Is Coast FIRE Calculator free?
Coast FIRE Calculator costs $4.99, and also offers in-app purchases.
Which has better reviews, Compounder or Coast FIRE Calculator?
Compounder is rated higher. Compounder averages 4.8 out of 5 from 4.3K ratings, while Coast FIRE Calculator averages 1.0 from 1 ratings.
Do Compounder or Coast FIRE Calculator have ads?
Neither Compounder nor Coast FIRE Calculator shows ads.
Which is updated more often, Compounder or Coast FIRE Calculator?
Compounder ships an update every 3 weeks, and Coast FIRE Calculator every 2 days. Most recently, Compounder was updated on October 25, 2026 and Coast FIRE Calculator on October 24, 2026.

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