# Device System Services vs JS.Notebook

The clearest difference is rating: JS.Notebook at 5.0 against Device System Services's 4.5. JS.Notebook also leads on in-app purchases (none vs 1) and ads (none vs shown). Device System Services's advantage is update cadence (every 4 months vs every 50 months) and ratings volume (394 vs 1). On price and device support there is nothing between them.

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

JS.Notebook holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Device System Services has 394 ratings behind it against 1, so its average is the more settled of the two.

Device System Services ships an update every 4 months, JS.Notebook every 50 months. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Device System Services | JS.Notebook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (394 ratings)](https://appshunter.io/ios/app/device-system-services-tools/id1126227676/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/jsnotebook/id1470144639/reviews)** |
| Number of ratings | **394** | 1 |
| Positive reviews | 51.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 4 months** | Every 50 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 19 MB |
| Requires iOS | 16.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Albert Parti](https://appshunter.io/developer/534966701) | [Zijie Deng](https://appshunter.io/developer/1070117038) |

## What reviewers say

### 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


### JS.Notebook

[App page](https://appshunter.io/ios/app/jsnotebook/id1470144639)

Build, test, and run your JavaScript code directly on your iOS device. This utility allows you to execute scripts in widgets and even use your device as a host for computer browser code execution.

**Highlights:** Build JavaScript code, Test code at runtime, Run code in widgets, Use device as code host, Code execution in computer browser

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Device System Services free?

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

### Is JS.Notebook free?

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

### Which has better reviews, Device System Services or JS.Notebook?

JS.Notebook is rated higher. Device System Services averages 4.5 out of 5 from 394 ratings, while JS.Notebook averages 5.0 from 1 ratings.

### Do Device System Services or JS.Notebook have ads?

Device System Services shows ads; JS.Notebook does not.

### Which is updated more often, Device System Services or JS.Notebook?

Device System Services ships an update every 4 months, and JS.Notebook every 50 months. Most recently, Device System Services was updated on September 19, 2026 and JS.Notebook on September 17, 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.*