# Old PDF Reader vs Unit Converter

The clearest difference is update cadence: Unit Converter at daily against Old PDF Reader's every 24 months. Old PDF Reader's advantage is iOS requirement (7.1 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Old PDF Reader ships an update every 24 months, Unit Converter daily. The most recent releases landed on October 2, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Old PDF Reader | Unit Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/old-pdf-reader/id507624100/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Daily** |
| Monetization | Free | — |
| Size | 48 MB | 20 MB |
| Requires iOS | **7.1** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [STUDIO SHIN](https://appshunter.io/developer/300665413) | [SEOKWON YANG](https://appshunter.io/developer/1863325487) |

## What reviewers say

### Old PDF Reader

[App page](https://appshunter.io/ios/app/old-pdf-reader/id507624100)

Easily browse and view your PDF documents. Adjust the display style in six stages for comfortable reading. Import PDFs directly from your device's share function.

**Highlights:** PDF document browsing, Adjustable display style, Import from share button, Document list management, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Unit Converter

[App page](https://appshunter.io/ios/app/unit-converter-slox/id6756968552)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Old PDF Reader free?

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

### Is Unit Converter free?

Unit Converter is free to download, with no in-app purchases.

### Do Old PDF Reader or Unit Converter have ads?

Neither Old PDF Reader nor Unit Converter shows ads.

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

Old PDF Reader ships an update every 24 months, and Unit Converter daily. Most recently, Old PDF Reader was updated on October 2, 2026 and Unit Converter on October 19, 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.*