# Number Line, by MLC vs BOT Spelling

The clearest difference is review sentiment: Number Line, by MLC at 67% against BOT Spelling's 0%. Number Line, by MLC also leads on monetization model (free vs subscription). BOT Spelling's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.1). On price, update cadence, 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.

Number Line, by MLC ships an update every 13 months, BOT Spelling every 7 months. The most recent releases landed on October 9, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Number Line, by MLC | BOT Spelling |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (15 ratings)](https://appshunter.io/ios/app/number-line-by-mlc/id751816884/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 7 months** |
| Monetization | **Free** | Subscription |
| Size | 7 MB | 36 MB |
| Requires iOS | 16.1 | **12.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [The Math Learning Center](https://appshunter.io/developer/1542700905) | [Peggy Markham](https://appshunter.io/developer/951379850) |

## 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


### BOT Spelling

[App page](https://appshunter.io/ios/app/bot-spelling-proofreading/id955369232)

This app helps high school students prepare for the Proofreading section of the Texas UIL Spelling contest. It presents word groups, requiring users to identify and correctly spell misspelled words, reinforcing learning until mastery.

**Highlights:** UIL Proofreading section preparation, Identify and spell misspelled words, Incorrectly spelled words repeat, Progress tracking, Full content subscription

**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 BOT Spelling free?

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

### Do Number Line, by MLC or BOT Spelling have ads?

Neither Number Line, by MLC nor BOT Spelling shows ads.

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

Number Line, by MLC ships an update every 13 months, and BOT Spelling every 7 months. Most recently, Number Line, by MLC was updated on October 9, 2026 and BOT Spelling on October 29, 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.*