# Unit Converter and Conversion vs Mail Scan

The clearest difference is rating: Unit Converter and Conversion at 4.5 against Mail Scan's 1.0. Unit Converter and Conversion also leads on ratings volume (48 vs 1). Mail Scan's advantage is ads (none vs shown). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Unit Converter and Conversion sells 1 one-off in-app purchase and Mail Scan sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Unit Converter and Conversion holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: Unit Converter and Conversion has 48 ratings behind it against 1, so its average is the more settled of the two.

Unit Converter and Conversion ships an update every 10 months, Mail Scan every 5 months. The most recent releases landed on September 22, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Unit Converter and Conversion | Mail Scan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (48 ratings)](https://appshunter.io/ios/app/unit-converter-and-conversion/id1350107532/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/mail-scan/id6473664404/reviews) |
| Number of ratings | **48** | 1 |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 10 months | **Every 5 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 42 MB | 12 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Asad Ahsan](https://appshunter.io/developer/1326954499) | [Tech Positive](https://appshunter.io/developer/580207852) |

## What reviewers say

### Unit Converter and Conversion

[App page](https://appshunter.io/ios/app/unit-converter-and-conversion/id1350107532)

This app offers a user-friendly interface for converting units across more than 40 categories, including length, weight, volume, and digital storage. It works offline and saves conversion history for future reference. Ideal for students and professionals needing quick and accurate conversions.

**Highlights:** Over 40 conversion categories, Offline functionality, Conversion history saving, User-friendly interface, Supports length, weight, volume, and more, Elegant graphics

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unit Converter Pro | $4.99 | one-time |


### Mail Scan

[App page](https://appshunter.io/ios/app/mail-scan/id6473664404)

Transform your mobile device into a powerful document scanner and email sender. Digitize physical documents into high-quality, searchable PDFs with a single tap. Seamlessly integrate with multiple email accounts for efficient sharing.

**Highlights:** Effortless document scanning, Searchable PDF creation, One-tap email delivery, Unlimited email account switching, Intuitive user interface, Privacy-focused document handling

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $2.99 | per month |
| Full Access | $29.99 | per year |


## Frequently asked questions

### Is Unit Converter and Conversion free?

Unit Converter and Conversion is free to download, with in-app purchases available.

### Is Mail Scan free?

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

### Which has better reviews, Unit Converter and Conversion or Mail Scan?

Unit Converter and Conversion is rated higher. Unit Converter and Conversion averages 4.5 out of 5 from 48 ratings, while Mail Scan averages 1.0 from 1 ratings.

### Do Unit Converter and Conversion or Mail Scan have ads?

Unit Converter and Conversion shows ads; Mail Scan does not.

### Which is updated more often, Unit Converter and Conversion or Mail Scan?

Unit Converter and Conversion ships an update every 10 months, and Mail Scan every 5 months. Most recently, Unit Converter and Conversion was updated on September 22, 2026 and Mail Scan on September 25, 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.*