Output Messenger vs Red PDF Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Output Messenger
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.
- Private secure office messenger
- Cross-platform support (Desktop & Mobile)
- One-on-one and group chat
- Push notifications
- Offline and announcement messages
- No ads
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Output Messenger is designed to use a private secure messenger for your office. This intranet messenger improves internal communications, business productivity and relationships with colleagues inside office. IMPORTANT: Output Messenger requires Server application to be installed and running in your server. The Public IP Address or Domain name of the server running host should be provided in this Output Messenger App to connect with server. Why use Output Messenger ? - Cross platform (Desktop and Mobile) - View & chat with your Office users - One-on-One private chat with users - Group Chat with multiple users - Always-On. Runs as a service in the background. - Push Notifications - Offline / Announcement messages - No ads.
Red PDF Reader
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Red PDF Reader A clean, distraction-free PDF reader designed for people who actually read. Open any PDF from your Files app and pick up exactly where you left off — Red PDF Reader remembers your last page automatically and syncs it across all your devices via iCloud. Switch from your iPhone to your iPad and continue reading without missing a beat. Features: Continuous reading — smooth, vertical scroll layout optimized for long documents Auto-resume — your last page is saved automatically and synced across devices Recent files — quickly jump back to any of your last 50 documents Page thumbnails — visual panel for fast navigation through any document Go to page — jump directly to any page with a single tap Page indicator — always know where you are with a subtle page counter overlay No sign-in required. No subscriptions. No ads. Just your PDFs, exactly where you left them.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Output Messenger | Red PDF Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (71 ratings) — better | — |
| Positive reviews | 19.5% of reviews | — |
| Number of ratings | 71 — better | — |
| Update frequency | Monthly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18 |
| Further details — not scored | ||
| Size | 23 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Srimax Software System | Khurshed Gulov |
In-app purchases
Output Messenger
No in-app purchases
Red PDF Reader
No in-app purchases
Questions
Is Output Messenger free?
Is Red PDF Reader free?
Do Output Messenger or Red PDF Reader have ads?
Which is updated more often, Output Messenger or Red PDF Reader?
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