# Number Line, by MLC vs Sumdog

The clearest difference is in-app purchases: Number Line, by MLC at none against Sumdog's 1. Number Line, by MLC also leads on rating (4.4 vs 4.2). Sumdog's advantage is update cadence (every 2 months vs every 13 months) and ratings volume (1.6K vs 15). On price, review sentiment, ads and iOS requirement there is nothing between them.

Both are free to download. Sumdog sells 1 in-app purchase, starting at $8.99 per month. Number Line, by MLC asks for nothing beyond the download.

Number Line, by MLC holds the better App Store score, 4.4 against 4.2. That said, the two scores are not equally well evidenced: Sumdog has 1.6K ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 67% of Number Line, by MLC's written reviews are positive against 64% of Sumdog's.

Number Line, by MLC ships an update every 13 months, Sumdog every 2 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Number Line, by MLC | Sumdog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (15 ratings)](https://appshunter.io/ios/app/number-line-by-mlc/id751816884/reviews)** | [4.2 (1.6K ratings)](https://appshunter.io/ios/app/sumdog/id1145809959/reviews) |
| Number of ratings | 15 | **1.6K** |
| Positive reviews | **66.7% of reviews** | 63.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 135 MB |
| Requires iOS | 16.1 | **15.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [The Math Learning Center](https://appshunter.io/developer/1542700905) | [Sumdog Ltd.](https://appshunter.io/developer/644331332) |

## 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


### Sumdog

[App page](https://appshunter.io/ios/app/sumdog/id1145809959)

This app offers personalized math and spelling practice for children aged 5-14 through engaging games and adaptive learning. It uses diagnostic tests to tailor learning journeys and provides virtual rewards to motivate students. Parents can set up accounts for home use or connect to school-assigned work.

**Highlights:** Personalized adaptive learning, Engaging single and multiplayer games, Thousands of standards-aligned questions, Virtual coin rewards system, 3D avatar and house personalization, Diagnostic assessment

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Family Membership | $8.99 | per month |

**What reviewers like**

- 🎮 Fun and engaging games
- 🏆 Competitive leaderboards
- 🏠 Customizable avatar and house
- 📚 Helps with learning math, spelling, and grammar
- 🏫 Useful for schools and teachers

**What reviewers complain about**

- 🐛 Glitches and bugs
- 🕰️ Slow loading times
- 🔒 Limited access to premium features without subscription
- 🤖 Weird or unappealing 3D character models
- 🔍 Lack of instructions for some games

**Reported bugs**

- Flower Defenders game not working properly
- Goalz game not registering shots correctly
- Sudden logout issues
- Incompatibility with certain devices or browsers

**Requested features**

- Add more free games
- Bring back old 2D games
- Allow interaction with house and garden items
- Improve multiplayer functionality
- Add more customization options for avatar and house


## Frequently asked questions

### Is Number Line, by MLC free?

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

### Is Sumdog free?

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

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

Number Line, by MLC is rated higher. Number Line, by MLC averages 4.4 out of 5 from 15 ratings, while Sumdog averages 4.2 from 1.6K ratings.

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

Neither Number Line, by MLC nor Sumdog shows ads.

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

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