# System Guard vs MainframeMonitor

The clearest difference is rating: MainframeMonitor at 5.0 against System Guard's 4.5. MainframeMonitor also leads on in-app purchases (none vs 1) and ads (none vs shown). System Guard's advantage is ratings volume (979 vs 1). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. System Guard sells 1 one-off in-app purchase. MainframeMonitor asks for nothing beyond the download.

MainframeMonitor holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: System Guard has 979 ratings behind it against 1, so its average is the more settled of the two.

System Guard ships an update weekly, MainframeMonitor every 10 days. The most recent releases landed on October 20, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | System Guard | MainframeMonitor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (979 ratings)](https://appshunter.io/ios/app/system-guard/id1210477137/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mainframemonitor/id6809454680/reviews)** |
| Number of ratings | **979** | 1 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 24 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RBT Digital LLC](https://appshunter.io/developer/1208547221) | [Ralf Langhoff](https://appshunter.io/developer/1706183785) |

## What reviewers say

### System Guard

[App page](https://appshunter.io/ios/app/system-guard/id1210477137)

Gain deep insights into your iPhone, iPad, or Apple Watch. Monitor device health, storage, battery, and network status with clear explanations and historical data. Perform hardware diagnostics and optimize your device's performance.

**Highlights:** Device status overview, Detailed battery health and history, Comprehensive hardware specifications, Storage management and optimization, Network analysis and speed tests, Hardware diagnostic tests, Home/Lock Screen widgets and Siri integration

**Features:** Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| System Guard Pro | $2.99 | one-time |


### MainframeMonitor

[App page](https://appshunter.io/ios/app/mainframemonitor/id6809454680)

Transform your iPhone into a vintage mainframe with a nostalgic CRT display. Monitor live system stats like battery, CPU, and memory, all within an authentic retro console experience. Includes hidden classic text-based games.

**Highlights:** Live system monitoring (battery, CPU, memory, storage), Home screen widgets, Authentic CRT effects (glow, scanlines), Retro boot sequence, Hidden classic text-based games, Customizable color themes (Green, Amber)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is System Guard free?

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

### Is MainframeMonitor free?

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

### Which has better reviews, System Guard or MainframeMonitor?

MainframeMonitor is rated higher. System Guard averages 4.5 out of 5 from 979 ratings, while MainframeMonitor averages 5.0 from 1 ratings.

### Do System Guard or MainframeMonitor have ads?

System Guard shows ads; MainframeMonitor does not.

### Which is updated more often, System Guard or MainframeMonitor?

System Guard ships an update weekly, and MainframeMonitor every 10 days. Most recently, System Guard was updated on October 20, 2026 and MainframeMonitor on October 14, 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.*