# Red PDF Reader vs SimpPDF Reader

The clearest difference is update cadence: SimpPDF Reader at daily against Red PDF Reader's every 4 days. 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.

Red PDF Reader ships an update every 4 days, SimpPDF Reader daily. The most recent releases landed on September 21, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Red PDF Reader | SimpPDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | **Daily** |
| Size | 4 MB | 1 MB |
| Requires iOS | 18 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Khurshed Gulov](https://appshunter.io/developer/1329538296) | [Wei He](https://appshunter.io/developer/6783615797) |

## What reviewers say

### Red PDF Reader

[App page](https://appshunter.io/ios/app/red-pdf-reader/id6763583714)

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

**In-app purchases:** none


### SimpPDF Reader

[App page](https://appshunter.io/ios/app/simppdf-reader/id6783615795)

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

**In-app purchases:** none


## Frequently asked questions

### Is Red PDF Reader free?

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

### Is SimpPDF Reader free?

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

### Do Red PDF Reader or SimpPDF Reader have ads?

Neither Red PDF Reader nor SimpPDF Reader shows ads.

### Which is updated more often, Red PDF Reader or SimpPDF Reader?

Red PDF Reader ships an update every 4 days, and SimpPDF Reader daily. Most recently, Red PDF Reader was updated on September 21, 2026 and SimpPDF Reader on September 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.*