# Output Messenger vs Red PDF Reader

The clearest difference is update cadence: Red PDF Reader at every 4 days against Output Messenger's monthly. Output Messenger's advantage is iOS requirement (15.0 vs 18). 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.

Output Messenger ships an update monthly, Red PDF Reader every 4 days. The most recent releases landed on August 30, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Output Messenger | Red PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (71 ratings)](https://appshunter.io/ios/app/output-messenger/id924013474/reviews)** | — |
| Number of ratings | **71** | — |
| Positive reviews | 19.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Free | — |
| Size | 23 MB | 4 MB |
| Requires iOS | **15.0** | 18 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Srimax Software System](https://appshunter.io/developer/582993446) | [Khurshed Gulov](https://appshunter.io/developer/1329538296) |

## What reviewers say

### Output Messenger

[App page](https://appshunter.io/ios/app/output-messenger/id924013474)

A secure, private messenger for office environments that enhances internal communication, boosts productivity, and strengthens colleague relationships. It requires a server application to be installed and running to connect.

**Highlights:** Private secure office messenger, Cross-platform support (Desktop & Mobile), One-on-one and group chat, Push notifications, Offline and announcement messages, No ads

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

**In-app purchases:** none


### Red PDF Reader

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Output Messenger free?

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

### Is Red PDF Reader free?

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

### Do Output Messenger or Red PDF Reader have ads?

Neither Output Messenger nor Red PDF Reader shows ads.

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

Output Messenger ships an update monthly, and Red PDF Reader every 4 days. Most recently, Output Messenger was updated on August 30, 2026 and Red PDF Reader on September 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.*