# Calm Blocks vs Duel Stack

The clearest difference is update cadence: Calm Blocks at every 6 days against Duel Stack's every 2 weeks. Calm Blocks also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Calm Blocks sells 1 one-off in-app purchase and Duel Stack sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Calm Blocks ships an update every 6 days, Duel Stack every 2 weeks. Both last shipped on October 1, 2026.

## The numbers

| Metric | Calm Blocks | Duel Stack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Every 2 weeks |
| Size | 42 MB | 103 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Takumi Kinjo](https://appshunter.io/developer/1870472112) | [Yousef Alenezi](https://appshunter.io/developer/1092319508) |

## What reviewers say

### Calm Blocks

[App page](https://appshunter.io/ios/app/calm-blocks-block-puzzle-game/id6758036903)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告除去 | $2.99 | one-time |


### Duel Stack

[App page](https://appshunter.io/ios/app/duel-stack-multiplayer/id6760616024)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hype Emoji Pack | $0.99 | one-time |
| Savage Emoji Pack | $0.99 | one-time |
| 100 Coins | $0.99 | one-time |
| Crystal | $0.99 | one-time |
| Marble | $0.99 | one-time |
| Galaxy | $0.99 | one-time |
| Carbon | $0.99 | one-time |
| Ancient | $0.99 | one-time |
| Holo | $0.99 | one-time |
| 1500 Coins | $9.99 | one-time |


## Frequently asked questions

### Is Calm Blocks free?

Calm Blocks is free to download, with in-app purchases available.

### Is Duel Stack free?

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

### Do Calm Blocks or Duel Stack have ads?

Both Calm Blocks and Duel Stack show ads.

### Which is updated more often, Calm Blocks or Duel Stack?

Calm Blocks ships an update every 6 days, and Duel Stack every 2 weeks. Most recently, Calm Blocks was updated on October 1, 2026 and Duel Stack on October 1, 2026.

---

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