# PDF Reader vs Unit Converter & Dictionary

The clearest difference is in-app purchases: PDF Reader at none against Unit Converter & Dictionary's 1. PDF Reader also leads on ratings volume (79 vs 1) and update cadence (every 6 days vs every 3 weeks). Unit Converter & Dictionary's advantage is rating (5.0 vs 4.6). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Unit Converter & Dictionary sells 1 in-app purchase, starting at $0.99 per month. PDF Reader asks for nothing beyond the download.

Unit Converter & Dictionary holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: PDF Reader has 79 ratings behind it against 1, so its average is the more settled of the two.

PDF Reader ships an update every 6 days, Unit Converter & Dictionary every 3 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | PDF Reader | Unit Converter & Dictionary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (79 ratings)](https://appshunter.io/ios/app/pdf-reader-viewer/id6746119431/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unit-converter-and-dictionary/id6795361946/reviews)** |
| Number of ratings | **79** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Every 3 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 116 MB | 13 MB |
| Requires iOS | 16 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [All About Housing LLC](https://appshunter.io/developer/1773925650) | [Mikoto Gateway](https://appshunter.io/developer/6795057863) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-viewer/id6746119431)

This app provides a privacy-focused way to view, organize, and manage PDF files on your device. It offers tools for merging, splitting, securing documents, and converting images to PDF, all processed locally for enhanced data safety.

**Highlights:** View and organize PDF files, Merge and split PDFs, Secure documents with passwords, Convert images to PDF, Built-in document scanner, Local data processing for privacy

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

**In-app purchases:** none


### Unit Converter & Dictionary

[App page](https://appshunter.io/ios/app/unit-converter-and-dictionary/id6795361946)

This app offers comprehensive unit conversion across numerous categories, including specialized and traditional units. It also functions as a dictionary, explaining unit meanings, pronunciations, and providing fun facts. Real-time currency conversion is available, with an optional premium plan for AI assistance and ad removal.

**Highlights:** Extensive unit conversion categories, Unit dictionary with pronunciation and facts, Real-time currency conversion, Offline conversion capabilities, AI support for app usage (Premium), Traditional and specialized unit support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムプラン | $0.99 | per month |


## Frequently asked questions

### Is PDF Reader free?

PDF Reader is free to download, with no in-app purchases.

### Is Unit Converter & Dictionary free?

Unit Converter & Dictionary is free to download, with in-app purchases available.

### Which has better reviews, PDF Reader or Unit Converter & Dictionary?

Unit Converter & Dictionary is rated higher. PDF Reader averages 4.6 out of 5 from 79 ratings, while Unit Converter & Dictionary averages 5.0 from 1 ratings.

### Do PDF Reader or Unit Converter & Dictionary have ads?

Both PDF Reader and Unit Converter & Dictionary show ads.

### Which is updated more often, PDF Reader or Unit Converter & Dictionary?

PDF Reader ships an update every 6 days, and Unit Converter & Dictionary every 3 weeks. Most recently, PDF Reader was updated on October 30, 2026 and Unit Converter & Dictionary on October 31, 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.*