# System Activity Monitors vs Deviapp

The clearest difference is ads: System Activity Monitors at none against Deviapp's shown. Deviapp's advantage is rating (4.5 vs 4.2) and review sentiment (86% vs 76%). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

Both are free to download. System Activity Monitors sells 4 in-app purchases, starting at $3.99 per 7 days and Deviapp sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Deviapp holds the better App Store score, 4.5 against 4.2. Both are backed by a comparable volume of ratings — 774 and 480 respectively. Written reviews point the same way: 76% of System Activity Monitors's written reviews are positive against 86% of Deviapp's.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 11, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | System Activity Monitors | Deviapp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (774 ratings)](https://appshunter.io/ios/app/system-activity-monitors/id386118145/reviews) | **[4.5 (480 ratings)](https://appshunter.io/ios/app/deviapp-device-diagnostics/id1570602827/reviews)** |
| Number of ratings | **774** | 480 |
| Positive reviews | 76.0% of reviews | **86.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 28 MB | 13 MB |
| Requires iOS | 13.0 | **12.2** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tekton Technologies (P) Ltd.](https://appshunter.io/developer/343534621) | [LOOP LEAD CONSULTING PC](https://appshunter.io/developer/1526489486) |

## What reviewers say

### System Activity Monitors

[App page](https://appshunter.io/ios/app/system-activity-monitors/id386118145)

Monitor your device's health with this comprehensive tool. Track memory, battery performance, storage, and network details. Get detailed camera information and helpful battery-saving tips to optimize your iPhone.

**Highlights:** Memory usage tracking, Battery performance monitoring, Device IP and hardware address, Battery saving tips, Used and free space indicator, Detailed camera information, System and hardware specs

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sysmon Pro | $3.99 | per 7 days |
| Sysmon Pro | $6.99 | per month |
| Sysmon Pro | $29.99 | per year |
| Real Time Graphs | $2.99 | one-time |

**What reviewers like**

- 💯 Excellent app
- 🎆 Great app
- 🔒 Respects privacy
- 🔋 Helpful battery tips
- 👍 Simple and straightforward

**What reviewers complain about**

- 🐛 Buggy updates
- 💰 Subscription-based model
- 🔒 Privacy concerns due to required login
- 🔍 Limited functionality for free version
- 🔍 Inaccurate device information

**Reported bugs**

- Crashes on certain devices
- Login/registration issues
- Incorrect memory/CPU usage reporting

**Requested features**

- Ability to close/manage running apps
- More detailed app-level usage breakdown
- Dark mode option
- Widgets for quick access
- Ability to reclaim memory/free up storage


### Deviapp

[App page](https://appshunter.io/ios/app/deviapp-device-diagnostics/id1570602827)

Access detailed information about your device's software, memory, battery, and technical specifications. It also offers display diagnostics and a feature to block phishing sites for enhanced online safety and data protection.

**Highlights:** Device information (software, memory, battery), Technical and physical characteristics, Display diagnostics, Phishing site blocking, Ad blocking (subscription), Safe browsing for children

**Features:** Safari Extension

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Deviapp Premium Week | $9.99 | per 7 days |
| Deviapp Premium Month | $29.99 | per month |

**What reviewers like**

- 🔒 Protects against cyber security risks
- 👍 Easy to use and understand
- 🚀 Efficient data management

**What reviewers complain about**

- 🐛 Inaccurate virus detection
- 💰 Charges fees for basic functionality
- 🚫 Unreliable and unresponsive support

**Reported bugs**

- Frequent crashes and freezes
- Compatibility issues with older devices

**Requested features**

- Option to cancel subscription
- Transparent pricing structure


## Frequently asked questions

### Is System Activity Monitors free?

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

### Is Deviapp free?

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

### Which has better reviews, System Activity Monitors or Deviapp?

Deviapp is rated higher. System Activity Monitors averages 4.2 out of 5 from 774 ratings, while Deviapp averages 4.5 from 480 ratings.

### Do System Activity Monitors or Deviapp have ads?

Deviapp shows ads; System Activity Monitors does not.

### Which is updated more often, System Activity Monitors or Deviapp?

System Activity Monitors ships an update every 3 months, and Deviapp every 3 months. Most recently, System Activity Monitors was updated on October 11, 2026 and Deviapp 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.*