# 4 vs Number Line

The clearest difference is update cadence: 4 at every 4 days against Number Line's every 15 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

4 ships an update every 4 days, Number Line every 15 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | 4 | Number Line |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/number-line/id1531893217/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 15 months |
| Monetization | — | Free |
| Size | 8 MB | 16 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kevin Holmes](https://appshunter.io/developer/1525696513) | [Blastoff Design](https://appshunter.io/developer/1455360972) |

## What reviewers say

### 4

[App page](https://appshunter.io/ios/app/4-mation/id1525696511)

**Features:** macOS Compatibility

**In-app purchases:** none


### Number Line

[App page](https://appshunter.io/ios/app/number-line/id1531893217)

This app provides an interactive number line for educational purposes, enabling users to visualize numbers, perform various math games, and practice rounding. Its simple interface supports zooming, swiping, and marking numbers with pins or freehand drawing.

**Highlights:** Infinite number line visualization, Rounding practice (nearest 10, 100, 10,000), Number comparison, Pinch-to-zoom functionality, Swipe navigation, Search for specific numbers, Pin marking, Freehand drawing tool

**In-app purchases:** none


## Frequently asked questions

### Is 4 free?

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

### Is Number Line free?

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

### Do 4 or Number Line have ads?

Neither 4 nor Number Line shows ads.

### Which is updated more often, 4 or Number Line?

4 ships an update every 4 days, and Number Line every 15 months. Most recently, 4 was updated on November 3, 2026 and Number Line on November 3, 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.*