# Simple Unit Converter App vs PDF Compressor

The clearest difference is price: PDF Compressor at Free against Simple Unit Converter App's $1.99. PDF Compressor also leads on ads (none vs shown) and ratings volume (5 vs 1). On rating, update cadence, in-app purchases and device support there is nothing between them.

PDF Compressor is free to download; Simple Unit Converter App costs $1.99 up front. Simple Unit Converter App sells 3 one-off in-app purchases and PDF Compressor sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Simple Unit Converter App against 5.0 for PDF Compressor. That said, the two scores are not equally well evidenced: PDF Compressor has 5 ratings behind it against 1, so its average is the more settled of the two.

Simple Unit Converter App ships an update every 3 months, PDF Compressor every 4 months. The most recent releases landed on June 23, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | Simple Unit Converter App | PDF Compressor |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/simple-unit-converter-app/id1531584085/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/pdf-compressor-pdfpress/id6756151715/reviews) |
| Number of ratings | 1 | **5** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 48 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CranialDev.LLC](https://appshunter.io/developer/1445325464) | [Imad Khan](https://appshunter.io/developer/1835041090) |

## What reviewers say

### Simple Unit Converter App

[App page](https://appshunter.io/ios/app/simple-unit-converter-app/id1531584085)

Easily convert between a vast range of measurement units, including acceleration, mass, temperature, and volume. This tool supports numerous categories to help you with everyday conversions and specialized needs.

**Highlights:** Wide array of unit types, Converts acceleration, mass, temperature, volume, and more, Supports numerous categories, User-requested additions, Intuitive interface

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NoAds | $0.99 | one-time |
| Small Tip | $1.99 | one-time |
| Generous Tip | $4.99 | one-time |


### PDF Compressor

[App page](https://appshunter.io/ios/app/pdf-compressor-pdfpress/id6756151715)

Easily reduce the size of PDF files without sacrificing quality. Organize documents with folders and import PDFs instantly. Ideal for students, professionals, and anyone needing to manage digital documents efficiently.

**Highlights:** Ultra-efficient PDF compression (up to 98%), High-quality output, Simple file picker, Built-in folder organization, Fast, intuitive interface, Works offline, Share compressed PDFs (Premium)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $19.99 | per year |


## Frequently asked questions

### Is Simple Unit Converter App free?

Simple Unit Converter App costs $1.99, and also offers in-app purchases.

### Is PDF Compressor free?

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

### Which has better reviews, Simple Unit Converter App or PDF Compressor?

Simple Unit Converter App and PDF Compressor are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do Simple Unit Converter App or PDF Compressor have ads?

Simple Unit Converter App shows ads; PDF Compressor does not.

### Which is updated more often, Simple Unit Converter App or PDF Compressor?

Simple Unit Converter App ships an update every 3 months, and PDF Compressor every 4 months. Most recently, Simple Unit Converter App was updated on June 23, 2026 and PDF Compressor on August 27, 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.*