# PDF Reader & Editor vs Cairos IOT

The clearest difference is in-app purchases: Cairos IOT at none against PDF Reader & Editor's 4. Cairos IOT also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.0). PDF Reader & Editor's advantage is update cadence (every 10 days vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. PDF Reader & Editor sells 4 in-app purchases, starting at $4.99 per 7 days. Cairos IOT asks for nothing beyond the download.

PDF Reader & Editor ships an update every 10 days, Cairos IOT every 3 weeks. The most recent releases landed on September 29, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | PDF Reader & Editor | Cairos IOT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (167 ratings)](https://appshunter.io/ios/app/pdf-reader-and-editor-gopdf/id1606524186/reviews)** | — |
| Number of ratings | **167** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 34 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Krejci](https://appshunter.io/developer/1737377675) | [JARS Services Private Limited](https://appshunter.io/developer/1157416886) |

## What reviewers say

### PDF Reader & Editor

[App page](https://appshunter.io/ios/app/pdf-reader-and-editor-gopdf/id1606524186)

Easily manage, view, and read all PDF documents on your smartphone or tablet. This versatile app offers a simple interface for quick access to files, with features like zoom, dark mode, and easy sharing. It's designed for efficient document handling anytime, anywhere.

**Highlights:** View and read all PDF files, Search and display all PDFs, Zoom in and out, Dark mode for comfortable reading, Share PDF files easily, Works offline, Print PDF files

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly PDF Go | $4.99 | per 7 days |
| Yearly PDF Go | $29.99 | per year |
| Remove Ads | $17.99 | one-time |
| One-time purchase | $99.99 | one-time |


### Cairos IOT

[App page](https://appshunter.io/ios/app/cairos-iot/id1663195314)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Reader & Editor free?

PDF Reader & Editor is free to download, with in-app purchases available.

### Is Cairos IOT free?

Cairos IOT is free to download, with no in-app purchases.

### Do PDF Reader & Editor or Cairos IOT have ads?

PDF Reader & Editor shows ads; Cairos IOT does not.

### Which is updated more often, PDF Reader & Editor or Cairos IOT?

PDF Reader & Editor ships an update every 10 days, and Cairos IOT every 3 weeks. Most recently, PDF Reader & Editor was updated on September 29, 2026 and Cairos IOT on September 23, 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.*