Comparison

Gann 9 vs Compound Interest

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

Head to head
About

Gann 9

Analyze stocks, forex, and indices using W.D. Gann's advanced tools, including the Square of 9. Predict support/resistance and trend changes with high accuracy. Offers automated angle selection and real-time market data.

Highlights
  • Square of 9 analysis
  • Predictive support/resistance levels
  • Trend change prediction (CIT dates)
  • Automated Swing Angle selection
  • Trade signals and scanner
  • Real-time market data
  • Portfolio tracking
Features
Read full description

Gann 9 is the only app that allows users to effortlessly apply the legendary W.D. Gann’s tools and techniques (including the Square of 9) to analyzing, charting and trading any stock, forex or index. It will allow you to predict with high accuracy and confidence future support/resistance levels and change in trend (CIT) dates. Swing Angles are empowered with the unique ability to automatically select the correct angle step (rise, rate of vibration) applicable to any instrument in any time frame and any price scale. The app's rich functionality is further enhanced with the addition of several in-app purchases (for the full list check Top In-App Purchases on the left). Built-in features Include: * Trade signals and scanner * Tunnel indicator * Gann retracement and range squaring tool * Trend indicator and Trend matrix * Swing indicator and Swing matrix * Automatically drawn Swing Angles * Swing exhaustion timer * Trend Bars™ (in-app purchase) * 130 years of DJIA price data (in-app purchase) * Gann price and time calculator allowing user inputs * Automatic range retracement and extension analysis * Unlimited stock symbol tracking * Track stock value and % change * Gann angles * Gann cycles * Square of 9 * Gann Seasonal Dates * My Portfolio * Extensive User Guide * Trading Strategies section * Real time market data and breadth indicators. * Multiple Watchlists synced between apps * Apple Watch scanning functionality Whether you’re a novice or experienced market analyst, you’ll be able, with a tap of a few buttons, to apply some of the most sophisticated technical analysis tools and to access live trade signals at a fraction of the cost of traditional charting packages.

About

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.

Highlights
  • 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
Features
Read full description

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

Gann 91 screens
Compound Interest4 screens

Verdict

The call

The clearest difference is review sentiment: Compound Interest at 68% against Gann 9's 17%. Compound Interest also leads on price ($1.99 vs $19.99) and rating (4.7 vs 3.3). Gann 9's advantage is update cadence (every 2 weeks vs every 4 months) and iOS requirement (8.0 vs 14.0). On ads and device support 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

Gann 9 costs $19.99 and Compound Interest $1.99 up front. Gann 9 sells 4 one-off in-app purchases. Compound Interest asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Compound Interest holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Compound Interest has 238 ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 17% of Gann 9's written reviews are positive against 68% of Compound Interest's.

UpkeepUpdate frequency

Gann 9 ships an update every 2 weeks, Compound Interest every 4 months. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

Scorecard8 real differences · 2 level
Gann 9 versus Compound Interest: the parameters behind the verdict, then further details
ParameterGann 9Compound Interest
Price$19.99$1.99 — better
Rating3.3 (13 ratings)4.7 (238 ratings) — better
Positive reviews16.7% of reviews67.7% of reviews — better
Number of ratings13238 — better
Update frequencyEvery 2 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better14.0
Further details — not scored
Size12 MB1 MB
Age rating4+4+
DeveloperCIT DatesTernUp LLC

Customer experience

Gann 9

All ratings13 ratings
Positive46.2%
Neutral23.1%
Negative30.8%
Written reviews18 reviews
Positive16.7%
Neutral16.7%
Negative66.7%

Compound Interest

All ratings238 ratings
Positive92.4%
Neutral1.7%
Negative5.9%
Written reviews31 reviews
Positive67.7%
Neutral0.0%
Negative32.3%

Bugs and requests

Gann 9

Not enough reviews yet to summarise bugs or requests.

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 more
  • 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 more
  • 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

4 purchases

Gann 9

One-time4
  • Bar Chart$9.99
  • Market scan$9.99
  • Vix market timing strategy$19.99
Show 1 more
  • DJIA History$49.99
None

Compound Interest

No in-app purchases

Questions

Is Gann 9 free?
Gann 9 costs $19.99, and also offers in-app purchases.
Is Compound Interest free?
Compound Interest costs $1.99, with no in-app purchases.
Which has better reviews, Gann 9 or Compound Interest?
Compound Interest is rated higher. Gann 9 averages 3.3 out of 5 from 13 ratings, while Compound Interest averages 4.7 from 238 ratings.
Do Gann 9 or Compound Interest have ads?
Neither Gann 9 nor Compound Interest shows ads.
Which is updated more often, Gann 9 or Compound Interest?
Gann 9 ships an update every 2 weeks, and Compound Interest every 4 months. Most recently, Gann 9 was updated on September 21, 2026 and Compound Interest on September 22, 2026.

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