# Gann 9 vs Compound Interest

The clearest difference is review sentiment: Compound Interest at 68% against Gann 9's 17%. Compound Interest also leads on rating (4.7 vs 3.4) and in-app purchases (none vs 6). Gann 9's advantage is price (Free vs $1.99) and update cadence (every 6 days vs every 4 months). On ads, device support and iOS requirement there is nothing between them.

Gann 9 is free to download; Compound Interest costs $1.99 up front. Gann 9 sells 6 in-app purchases, starting at $5.99 per month. Compound Interest asks for nothing beyond the download.

Compound Interest holds the better App Store score, 4.7 against 3.4. That said, the two scores are not equally well evidenced: Compound Interest has 239 ratings behind it against 14, 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.

Gann 9 ships an update every 6 days, Compound Interest every 4 months. Both last shipped on October 26, 2026.

## The numbers

| Metric | Gann 9 | Compound Interest |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [3.4 (14 ratings)](https://appshunter.io/ios/app/gann-9/id562713600/reviews) | **[4.7 (239 ratings)](https://appshunter.io/ios/app/compound-interest-compounder/id1457510419/reviews)** |
| Number of ratings | 14 | **239** |
| Positive reviews | 16.7% of reviews | **67.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 4 months |
| Monetization | Paid | **Free** |
| Best chart rank | — | **#38** |
| Size | 11 MB | 1 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CIT Dates](https://appshunter.io/developer/467316587) | [TernUp LLC](https://appshunter.io/developer/1457510418) |

## What reviewers say

### Gann 9

[App page](https://appshunter.io/ios/app/gann-9/id562713600)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gann 9 Pro | $5.99 | per month |
| Gann 9 Pro Yearly | $59.99 | per year |
| Bar Chart | $9.99 | one-time |
| Market scan | $9.99 | one-time |
| Vix market timing strategy | $19.99 | one-time |
| DJIA History | $49.99 | one-time |


### Compound Interest

[App page](https://appshunter.io/ios/app/compound-interest-compounder/id1457510419)

**Currently charting:** #38 Top Paid · Finance (US App Store)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Clean and simple design
- 🚀 Fast calculations
- 💡 Multiple tabs for different calculations
- ✨ Visually appealing interface
- 🚫 No obnoxious advertising

**What reviewers complain about**

- 🐛 App freezes frequently
- 🐛 App crashes on interaction
- 🐛 iPad version broken
- 🐛 Cannot input numbers
- 🐛 Calculations are wrong

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked questions

### Is Gann 9 free?

Gann 9 is free to download, with in-app purchases available.

### 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 3.4 out of 5 from 14 ratings, while Compound Interest averages 4.7 from 239 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 6 days, and Compound Interest every 4 months. Most recently, Gann 9 was updated on October 26, 2026 and Compound Interest on October 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*