# JavaScript Studio Pro vs Voltage Drop Pro

The clearest difference is price: Voltage Drop Pro at Free against JavaScript Studio Pro's $12.99. Voltage Drop Pro also leads on update cadence (every 3 months vs every 20 months). JavaScript Studio Pro's advantage is in-app purchases (none vs 1) and iOS requirement (10.0 vs 15.1). On ads and device support there is nothing between them.

Voltage Drop Pro is free to download; JavaScript Studio Pro costs $12.99 up front. Voltage Drop Pro sells 1 one-off in-app purchase. JavaScript Studio Pro asks for nothing beyond the download.

JavaScript Studio Pro ships an update every 20 months, Voltage Drop Pro every 3 months. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | JavaScript Studio Pro | Voltage Drop Pro |
| --- | --- | --- |
| Price | $12.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/javascript-studio-pro/id1533537039/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 months** |
| Monetization | Paid | — |
| Size | 33 MB | 39 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arrowat LLC](https://appshunter.io/developer/1358562640) | [BRUCE RAY MCCAMPBELL](https://appshunter.io/developer/6772438648) |

## What reviewers say

### JavaScript Studio Pro

[App page](https://appshunter.io/ios/app/javascript-studio-pro/id1533537039)

Develop web applications on your mobile device using JavaScript, CSS, and HTML. This tool offers error checking assistance as you code, ensuring you don't lose track of your ideas. Create and save your projects anywhere, anytime.

**Highlights:** Write JavaScript, CSS, HTML code, Create web applications, Error checking assistance, Save code and ideas, Mobile development environment

**Features:** macOS Compatibility

**In-app purchases:** none


### Voltage Drop Pro

[App page](https://appshunter.io/ios/app/voltage-drop-pro-electrician/id6781791471)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Voltage Drop Pro | $2.99 | one-time |


## Frequently asked questions

### Is JavaScript Studio Pro free?

JavaScript Studio Pro costs $12.99, with no in-app purchases.

### Is Voltage Drop Pro free?

Voltage Drop Pro is free to download, with in-app purchases available.

### Do JavaScript Studio Pro or Voltage Drop Pro have ads?

Neither JavaScript Studio Pro nor Voltage Drop Pro shows ads.

### Which is updated more often, JavaScript Studio Pro or Voltage Drop Pro?

JavaScript Studio Pro ships an update every 20 months, and Voltage Drop Pro every 3 months. Most recently, JavaScript Studio Pro was updated on September 29, 2026 and Voltage Drop Pro on October 7, 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.*