# OrbitNote vs Number Line, by MLC

The clearest difference is in-app purchases: Number Line, by MLC at none against OrbitNote's 10. Number Line, by MLC also leads on review sentiment (67% vs 50%). OrbitNote's advantage is update cadence (monthly vs every 13 months) and rating (4.7 vs 4.4). On price, ads and iOS requirement there is nothing between them.

Both are free to download. OrbitNote sells 10 one-off in-app purchases. Number Line, by MLC asks for nothing beyond the download.

OrbitNote holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 60 and 15 respectively. Written reviews complicate that: 50% of OrbitNote's written reviews are positive against 67% of Number Line, by MLC's, so the app with the better star average is not the one people write more warmly about.

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

## The numbers

| Metric | OrbitNote | Number Line, by MLC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (60 ratings)](https://appshunter.io/ios/app/orbitnote/id666770153/reviews)** | [4.4 (15 ratings)](https://appshunter.io/ios/app/number-line-by-mlc/id751816884/reviews) |
| Number of ratings | **60** | 15 |
| Positive reviews | 50.0% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 13 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 252 MB | 7 MB |
| Requires iOS | **15.5** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Everway Opco Ltd.](https://appshunter.io/developer/600829241) | [The Math Learning Center](https://appshunter.io/developer/1542700905) |

## What reviewers say

### OrbitNote

[App page](https://appshunter.io/ios/app/orbitnote/id666770153)

This tool allows users to read, annotate, and listen to PDF documents. It converts image-based PDFs to accessible text and offers features like speech playback, highlighting, and iCloud sync for seamless document management across devices.

**Highlights:** Annotate PDFs with highlights, underscores, and notes, Convert image PDFs to searchable text, Listen to PDFs with human-quality voice playback, Change background and text colors for readability, Sync documents and annotations with iCloud, Import/export PDFs from cloud storage and other apps

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Krzysztof | $1.99 | one-time |
| Joaquim | $1.99 | one-time |
| 5000 Credits | $3.99 | one-time |
| Elise | $3.99 | one-time |
| Valentin | $3.99 | one-time |
| Elias | $3.99 | one-time |
| Emilie | $3.99 | one-time |
| Filip | $3.99 | one-time |
| Freja | $3.99 | one-time |
| Unlock ClaroPDF Pro | $9.99 | one-time |


### 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


## Frequently asked questions

### Is OrbitNote free?

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

### Is Number Line, by MLC free?

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

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

OrbitNote is rated higher. OrbitNote averages 4.7 out of 5 from 60 ratings, while Number Line, by MLC averages 4.4 from 15 ratings.

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

Neither OrbitNote nor Number Line, by MLC shows ads.

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

OrbitNote ships an update monthly, and Number Line, by MLC every 13 months. Most recently, OrbitNote was updated on November 1, 2026 and Number Line, by MLC 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.*