# Number Line, by MLC vs Playground Physics

Number Line, by MLC and Playground Physics both sit at 4.4 stars, but that hides the real split: 67% of Number Line, by MLC's written reviews are positive against 40% of Playground Physics's. Number Line, by MLC also leads on ratings volume (15 vs 5). Playground Physics's advantage is update cadence (every 5 months vs every 13 months). On price, rating, ads and in-app purchases there is nothing between them.

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

Playground Physics holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews complicate that: 67% of Number Line, by MLC's written reviews are positive against 40% of Playground Physics's, so the app with the better star average is not the one people write more warmly about.

Number Line, by MLC ships an update every 13 months, Playground Physics every 5 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Number Line, by MLC | Playground Physics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (15 ratings)](https://appshunter.io/ios/app/number-line-by-mlc/id751816884/reviews) | **[4.6 (5 ratings)](https://appshunter.io/ios/app/playground-physics/id947124790/reviews)** |
| Number of ratings | **15** | 5 |
| Positive reviews | **66.7% of reviews** | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 5 months** |
| Monetization | Free | Free |
| Size | 7 MB | 45 MB |
| Requires iOS | 16.1 | **15.0** |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [The Math Learning Center](https://appshunter.io/developer/1542700905) | [New York Hall of Science](https://appshunter.io/developer/947124789) |

## What reviewers say

### Number Line, by MLC

[App page](https://appshunter.io/ios/app/number-line-by-mlc/id751816884)

This app allows students to visualize number sequences and demonstrate mathematical strategies. It supports various number types and offers tools for annotation, problem-solving, and sharing work. Ideal for elementary classrooms and iPad learning environments.

**Highlights:** Visualize number sequences, Demonstrate counting, adding, subtracting, multiplying, dividing, Use whole numbers, fractions, decimals, or negative numbers, Add custom tick marks and labels, Hide and reveal numbers and jumps, Annotation and drawing tools, Save and share work

**Features:** macOS Compatibility

**In-app purchases:** none


### Playground Physics

[App page](https://appshunter.io/ios/app/playground-physics/id947124790)

Record videos of motion, trace paths, and analyze physics concepts like forces and energy. This tool helps educators bring Newton's Laws to life with interactive graphs and slow-motion playback. Ideal for middle and high school science.

**Highlights:** Record and analyze motion in videos, Trace paths and examine movement, Interactive scrubbable graphs, Slow-motion playback, Calculate forces and energy, Save and share performance videos

**In-app purchases:** none


## Frequently asked questions

### Is Number Line, by MLC free?

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

### Is Playground Physics free?

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

### Which has better reviews, Number Line, by MLC or Playground Physics?

Playground Physics is rated higher. Number Line, by MLC averages 4.4 out of 5 from 15 ratings, while Playground Physics averages 4.6 from 5 ratings.

### Do Number Line, by MLC or Playground Physics have ads?

Neither Number Line, by MLC nor Playground Physics shows ads.

### Which is updated more often, Number Line, by MLC or Playground Physics?

Number Line, by MLC ships an update every 13 months, and Playground Physics every 5 months. Most recently, Number Line, by MLC was updated on November 6, 2026 and Playground Physics on November 1, 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.*