# Number Line, by MLC vs R+ m.Design (ROBOTIS)

The clearest difference is review sentiment: Number Line, by MLC at 67% against R+ m.Design (ROBOTIS)'s 0%. Number Line, by MLC also leads on rating (4.4 vs 2.5) and ratings volume (15 vs 4). R+ m.Design (ROBOTIS)'s advantage is update cadence (every 4 months vs every 13 months) and device support (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Number Line, by MLC holds the better App Store score, 4.4 against 2.5. Both are backed by a comparable volume of ratings — 15 and 4 respectively. Written reviews point the same way: 67% of Number Line, by MLC's written reviews are positive against 0% of R+ m.Design (ROBOTIS)'s.

Number Line, by MLC ships an update every 13 months, R+ m.Design (ROBOTIS) every 4 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Number Line, by MLC | R+ m.Design (ROBOTIS) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (15 ratings)](https://appshunter.io/ios/app/number-line-by-mlc/id751816884/reviews)** | [2.5 (4 ratings)](https://appshunter.io/ios/app/r-plus-mdesign-robotis/id975779539/reviews) |
| Number of ratings | **15** | 4 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 7 MB | 201 MB |
| Requires iOS | 16.1 | **8.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [The Math Learning Center](https://appshunter.io/developer/1542700905) | [ROBOTIS CO., LTD.](https://appshunter.io/developer/948481761) |

## 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


### R+ m.Design (ROBOTIS)

[App page](https://appshunter.io/ios/app/r-plus-mdesign-robotis/id975779539)

This app provides interactive 3D animation assembly manuals for robot kits. Users can preview assembly steps and complete robot construction without traditional manuals. It includes a wide variety of example projects across different robot series.

**Highlights:** 3D animation assembly manuals, Step-by-step assembly previews, Interactive touch controls, Complete robot assembly guides, Extensive example project library

**Features:** macOS Compatibility

**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 R+ m.Design (ROBOTIS) free?

R+ m.Design (ROBOTIS) is free to download, with no in-app purchases.

### Which has better reviews, Number Line, by MLC or R+ m.Design (ROBOTIS)?

Number Line, by MLC is rated higher. Number Line, by MLC averages 4.4 out of 5 from 15 ratings, while R+ m.Design (ROBOTIS) averages 2.5 from 4 ratings.

### Do Number Line, by MLC or R+ m.Design (ROBOTIS) have ads?

Neither Number Line, by MLC nor R+ m.Design (ROBOTIS) shows ads.

### Which is updated more often, Number Line, by MLC or R+ m.Design (ROBOTIS)?

Number Line, by MLC ships an update every 13 months, and R+ m.Design (ROBOTIS) every 4 months. Most recently, Number Line, by MLC was updated on November 1, 2026 and R+ m.Design (ROBOTIS) 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.*