# JS.Notebook vs Mechanical Sound ID

The clearest difference is ads: JS.Notebook at none against Mechanical Sound ID's shown. Mechanical Sound ID's advantage is update cadence (fortnightly vs every 50 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

JS.Notebook ships an update every 50 months, Mechanical Sound ID fortnightly. The most recent releases landed on September 17, 2026 and August 3, 2026 respectively.

## The numbers

| Metric | JS.Notebook | Mechanical Sound ID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/jsnotebook/id1470144639/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 50 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 19 MB | 36 MB |
| Requires iOS | **14.0** | 15.8.3 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zijie Deng](https://appshunter.io/developer/1070117038) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### 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


### Mechanical Sound ID

[App page](https://appshunter.io/ios/app/mechanical-sound-id/id6738972003)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is JS.Notebook free?

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

### Is Mechanical Sound ID free?

Mechanical Sound ID is free to download, with no in-app purchases.

### Do JS.Notebook or Mechanical Sound ID have ads?

Mechanical Sound ID shows ads; JS.Notebook does not.

### Which is updated more often, JS.Notebook or Mechanical Sound ID?

JS.Notebook ships an update every 50 months, and Mechanical Sound ID fortnightly. Most recently, JS.Notebook was updated on September 17, 2026 and Mechanical Sound ID on August 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*