# Number Line, by MLC vs Delta

The clearest difference is rating: Number Line, by MLC at 4.4 against Delta's 3.1. Number Line, by MLC also leads on in-app purchases (none vs 3). Delta's advantage is update cadence (monthly vs every 13 months) and device support (4 vs 1). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Delta sells 3 one-off in-app purchases. Number Line, by MLC asks for nothing beyond the download.

Number Line, by MLC holds the better App Store score, 4.4 against 3.1. Both are backed by a comparable volume of ratings — 15 and 7 respectively. Written reviews split almost evenly too, at 67% and 67% positive.

Number Line, by MLC ships an update every 13 months, Delta monthly. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Number Line, by MLC | Delta |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (15 ratings)](https://appshunter.io/ios/app/number-line-by-mlc/id751816884/reviews)** | [3.1 (7 ratings)](https://appshunter.io/ios/app/delta-algorithms/id1436506800/reviews) |
| Number of ratings | **15** | 7 |
| Positive reviews | 66.7% of reviews | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Monthly** |
| Monetization | **Free** | Freemium |
| Size | 7 MB | 5 MB |
| Requires iOS | 16.1 | **13.0** |
| Devices | iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [The Math Learning Center](https://appshunter.io/developer/1542700905) | [Groupe MINASTE](https://appshunter.io/developer/1378426984) |

## 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


### Delta

[App page](https://appshunter.io/ios/app/delta-algorithms/id1436506800)

This app helps users solve math problems by creating and executing algorithms. It offers tools for homework checking, test preparation, and creating custom quizzes. Users can save, share, and download algorithms via the cloud.

**Highlights:** Create algorithms with natural language, Execute algorithms to solve math problems, Create and download custom quizzes, Save and share algorithms, Cloud synchronization for algorithms

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation 1 | $0.99 | one-time |
| Donation 2 | $2.99 | one-time |
| Donation 3 | $4.99 | one-time |


## Frequently asked questions

### Is Number Line, by MLC free?

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

### Is Delta free?

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

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

Number Line, by MLC is rated higher. Number Line, by MLC averages 4.4 out of 5 from 15 ratings, while Delta averages 3.1 from 7 ratings.

### Do Number Line, by MLC or Delta have ads?

Neither Number Line, by MLC nor Delta shows ads.

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

Number Line, by MLC ships an update every 13 months, and Delta monthly. Most recently, Number Line, by MLC was updated on November 6, 2026 and Delta on November 2, 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.*