# PDF Reader vs Kairso

The clearest difference is in-app purchases: Kairso at none against PDF Reader's 3. Kairso also leads on ads (none vs shown) and update cadence (every 3 days vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. PDF Reader sells 3 in-app purchases, starting at $2.49 per 7 days. Kairso asks for nothing beyond the download.

PDF Reader ships an update every 4 months, Kairso every 3 days. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | PDF Reader | Kairso |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (53 ratings)](https://appshunter.io/ios/app/pdf-reader-pdf-viewer-edit/id6448322721/reviews)** | — |
| Number of ratings | **53** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 48 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Mohit Rudani](https://appshunter.io/developer/1673702969) | [Cao Viet Duc](https://appshunter.io/developer/1795842647) |

## What reviewers say

### PDF Reader

[App page](https://appshunter.io/ios/app/pdf-reader-pdf-viewer-edit/id6448322721)

This application allows users to read, edit, and manage PDF files on their mobile devices. It offers offline viewing for PDFs, Word, Excel, and PowerPoint documents, along with features like bookmarking and file renaming. Enhance your productivity with this essential document management tool.

**Highlights:** View local PDF files, Load files from Files app, Save and rename PDF files, Share PDFs easily, Bookmark PDF pages, Offline document viewing, Dark Mode for reading

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly   1 Week | $2.49 | per 7 days |
| Monthly   1 Month | $5.99 | per month |
| Yearly   1 Year | $24.99 | per year |


### Kairso

[App page](https://appshunter.io/ios/app/kairso/id6785464828)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDF Reader free?

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

### Is Kairso free?

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

### Do PDF Reader or Kairso have ads?

PDF Reader shows ads; Kairso does not.

### Which is updated more often, PDF Reader or Kairso?

PDF Reader ships an update every 4 months, and Kairso every 3 days. Most recently, PDF Reader was updated on October 19, 2026 and Kairso on October 10, 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.*