# Echo Drop vs Sky Stack

The clearest difference is in-app purchases: Echo Drop at none against Sky Stack's 10. Echo Drop also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Sky Stack sells 10 one-off in-app purchases. Echo Drop asks for nothing beyond the download.

## The numbers

| Metric | Echo Drop | Sky Stack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 4 MB | 18 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Shanghai Ziye Network Technology Co., Ltd](https://appshunter.io/developer/1846570066) | [Gigabyte LLC](https://appshunter.io/developer/1145126101) |

## What reviewers say

### Echo Drop

[App page](https://appshunter.io/ios/app/echo-drop-bounce-to-melody/id6760639405)

**In-app purchases:** none


### Sky Stack

[App page](https://appshunter.io/ios/app/sky-stack-tower-block-game/id6760783698)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 500 coins | $1.99 | one-time |
| Style Pack Celestial | $1.99 | one-time |
| Starter Bundle | $2.99 | one-time |
| Piggy Bank | $2.99 | one-time |
| Remove Ads | $3.99 | one-time |
| 1400 coins | $4.99 | one-time |
| Season Pass | $5.99 | one-time |
| 3500 Coins | $9.99 | one-time |
| 8000 Coins | $19.99 | one-time |
| 25000 Coins | $49.99 | one-time |


## Frequently asked questions

### Is Echo Drop free?

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

### Is Sky Stack free?

Sky Stack is free to download, with in-app purchases available.

### Do Echo Drop or Sky Stack have ads?

Sky Stack shows ads; Echo Drop does not.

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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.*