# Power Reader vs Device System Services

The clearest difference is rating: Device System Services at 4.5 against Power Reader's 3.8. Device System Services also leads on ratings volume (394 vs 4). Power Reader's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. Device System Services sells 1 one-off in-app purchase. Power Reader asks for nothing beyond the download.

Device System Services holds the better App Store score, 4.5 against 3.8. That said, the two scores are not equally well evidenced: Device System Services has 394 ratings behind it against 4, so its average is the more settled of the two. Written reviews complicate that: 55% of Power Reader's written reviews are positive against 52% of Device System Services's, so the app with the better star average is not the one people write more warmly about.

Power Reader ships an update every 2 months, Device System Services every 4 months. Both last shipped on October 6, 2026.

## The numbers

| Metric | Power Reader | Device System Services |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (4 ratings)](https://appshunter.io/ios/app/power-reader-document-book-reader/id634735479/reviews) | **[4.5 (394 ratings)](https://appshunter.io/ios/app/device-system-services-tools/id1126227676/reviews)** |
| Number of ratings | 4 | **394** |
| Positive reviews | **55.0% of reviews** | 51.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 73 MB | 9 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [ComcSoft Corporation](https://appshunter.io/developer/413971334) | [Albert Parti](https://appshunter.io/developer/534966701) |

## What reviewers say

### Power Reader

[App page](https://appshunter.io/ios/app/power-reader-document-book-reader/id634735479)

This app allows you to view and manage a wide variety of document and eBook formats on your iPhone and iPad. It offers features like bookmarking, customizable reading settings, and cloud storage integration for seamless file access.

**Highlights:** View DOC, EXCEL, PDF, PPT, RTF, HTML, images, videos, and mp3, Read EPUB and TXT eBooks, Bookmark management for eBooks, Customizable reading settings (font, brightness, themes), File Manager with import/export and cloud integration, Download eBooks from websites

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

**In-app purchases:** none


### Device System Services

[App page](https://appshunter.io/ios/app/device-system-services-tools/id1126227676)

Monitor your device's hardware, network, memory, and storage with detailed insights and performance tracking. Includes diagnostic tools for network analysis and storage management. Offers widgets for real-time system information.

**Highlights:** Hardware specifications, Network status and diagnostics, Memory usage monitoring, Ping, LAN Scan, Port Scan tools, Storage management, System information widgets

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads System Service | $1.99 | one-time |

**What reviewers like**

- 👍 Clean and easy-to-use interface
- 🚀 Fast and responsive performance
- 📊 Comprehensive system information display
- 🌐 Useful network information details
- ⏱️ Shows device uptime information

**What reviewers complain about**

- 📺 Excessive full-screen video advertisements
- 🔊 Intrusive ads with sound that startle users
- ⚠️ Misleading security/storage warning popups
- 🎮 Irrelevant ads (e.g., game ads on iOS)
- 💰 Ads present even in paid version

**Reported bugs**

- App crashes on startup/launch
- Crashes when network module acquires external IP
- Requires airplane mode or disabled connectivity to function
- Incorrect device specifications (resolution, model variants)
- Static pie charts instead of dynamic system statistics

**Requested features**

- Option to delete accidentally copied items
- System reset functionality to restore original settings
- Camera information display
- External USB disk space usage tracking
- Memory cleaning/optimization features


## Frequently asked questions

### Is Power Reader free?

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

### Is Device System Services free?

Device System Services is free to download, with in-app purchases available.

### Which has better reviews, Power Reader or Device System Services?

Device System Services is rated higher. Power Reader averages 3.8 out of 5 from 4 ratings, while Device System Services averages 4.5 from 394 ratings.

### Do Power Reader or Device System Services have ads?

Device System Services shows ads; Power Reader does not.

### Which is updated more often, Power Reader or Device System Services?

Power Reader ships an update every 2 months, and Device System Services every 4 months. Most recently, Power Reader was updated on October 6, 2026 and Device System Services on October 6, 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.*