# Stack Number vs Merge Dots & Biology

The clearest difference is price: Stack Number at Free against Merge Dots & Biology's $1.99. Stack Number also leads on iOS requirement (15.0 vs 17.5). Merge Dots & Biology's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.

Stack Number is free to download; Merge Dots & Biology costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stack Number ships an update every 24 months, Merge Dots & Biology every 13 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Stack Number | Merge Dots & Biology |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/stack-number/id1048071754/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 24 months | **Every 13 months** |
| Monetization | Ad-supported | — |
| Size | 17 MB | 1 MB |
| Requires iOS | **15.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [亚州 王](https://appshunter.io/developer/991530214) | [Max Babenko](https://appshunter.io/developer/939746569) |

## What reviewers say

### Stack Number

[App page](https://appshunter.io/ios/app/stack-number/id1048071754)

Tap to drop blocks and merge adjacent ones with the same value to create higher numbers. Aim for the highest score possible in this engaging puzzle game.

**Highlights:** Block dropping mechanic, Adjacent block merging, Number value progression, High score pursuit, Simple tap controls

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

**In-app purchases:** none


### Merge Dots & Biology

[App page](https://appshunter.io/ios/app/merge-dots-and-biology/id6736862420)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Stack Number free?

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

### Is Merge Dots & Biology free?

Merge Dots & Biology costs $1.99, with no in-app purchases.

### Do Stack Number or Merge Dots & Biology have ads?

Stack Number shows ads; Merge Dots & Biology does not.

### Which is updated more often, Stack Number or Merge Dots & Biology?

Stack Number ships an update every 24 months, and Merge Dots & Biology every 13 months. Most recently, Stack Number was updated on October 24, 2026 and Merge Dots & Biology on October 25, 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.*