# WhenMoon vs Compound Interest Calculator !

The clearest difference is in-app purchases: WhenMoon at none against Compound Interest Calculator !'s 4. WhenMoon also leads on ads (none vs shown) and iOS requirement (12.1 vs 16.0). Compound Interest Calculator !'s advantage is update cadence (monthly vs every 2 months). On price and device support there is nothing between them.

Both are free to download. Compound Interest Calculator ! sells 4 in-app purchases, starting at $0.99 per month. WhenMoon asks for nothing beyond the download.

WhenMoon ships an update every 2 months, Compound Interest Calculator ! monthly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | WhenMoon | Compound Interest Calculator ! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Size | 15 MB | 36 MB |
| Requires iOS | **12.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Thomas Yoon](https://appshunter.io/developer/1268301168) | [seunghyun shin](https://appshunter.io/developer/1505190308) |

## What reviewers say

### WhenMoon

[App page](https://appshunter.io/ios/app/whenmoon/id1291450670)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Compound Interest Calculator !

[App page](https://appshunter.io/ios/app/compound-interest-calculator/id6449872832)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| one month subscription | $0.99 | per month |
| one year subscription | $4.99 | per year |
| free forever discount | $4.99 | one-time |
| free forever | $7.99 | one-time |


## Frequently asked questions

### Is WhenMoon free?

WhenMoon is free to download, with no in-app purchases.

### Is Compound Interest Calculator ! free?

Compound Interest Calculator ! is free to download, with in-app purchases available.

### Do WhenMoon or Compound Interest Calculator ! have ads?

Compound Interest Calculator ! shows ads; WhenMoon does not.

### Which is updated more often, WhenMoon or Compound Interest Calculator !?

WhenMoon ships an update every 2 months, and Compound Interest Calculator ! monthly. Most recently, WhenMoon was updated on November 6, 2026 and Compound Interest Calculator ! on October 30, 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.*