# Scientific Timer vs PDF Reader

The clearest difference is update cadence: PDF Reader at every 2 weeks against Scientific Timer's every 16 months. PDF Reader also leads on device support (3 vs 1) and iOS requirement (12.0 vs 18.0). On price, ads and in-app purchases there is nothing between them.

Scientific Timer costs $0.99 and PDF Reader $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scientific Timer ships an update every 16 months, PDF Reader every 2 weeks. The most recent releases landed on October 2, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Scientific Timer | PDF Reader |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/pdf-reader-pdf-vieweredit/id6745189063/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 weeks** |
| Monetization | — | Paid |
| Size | 8 MB | 42 MB |
| Requires iOS | 18.0 | **12.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stephane Boutet](https://appshunter.io/developer/1794014850) | [Grzegorz Rakoca](https://appshunter.io/developer/1778459428) |

## What reviewers say

### Scientific Timer

[App page](https://appshunter.io/ios/app/scientific-timer/id6741395405)

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

**In-app purchases:** none


### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-pdf-vieweredit/id6745189063)

This app automatically finds and organizes all PDF files on your device, allowing you to view, edit, and share them. It offers features like highlighting, note-taking, and electronic signatures for efficient document management.

**Highlights:** Automatic PDF scanning and organization, View, edit, and annotate PDFs, Highlight text and add notes, Electronic signatures and form filling, Convert photos to PDFs, Split and combine PDFs, Password protection for documents

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

**In-app purchases:** none


## Frequently asked questions

### Is Scientific Timer free?

Scientific Timer costs $0.99, with no in-app purchases.

### Is PDF Reader free?

PDF Reader costs $0.99, with no in-app purchases.

### Do Scientific Timer or PDF Reader have ads?

Neither Scientific Timer nor PDF Reader shows ads.

### Which is updated more often, Scientific Timer or PDF Reader?

Scientific Timer ships an update every 16 months, and PDF Reader every 2 weeks. Most recently, Scientific Timer was updated on October 2, 2026 and PDF Reader on October 15, 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.*