# STM vs JavaScript Studio Pro

The clearest difference is price: STM at Free against JavaScript Studio Pro's $12.99. STM also leads on update cadence (every 2 months vs every 20 months). JavaScript Studio Pro's advantage is in-app purchases (none vs 20) and iOS requirement (10.0 vs 15.6). On ads and device support there is nothing between them.

STM is free to download; JavaScript Studio Pro costs $12.99 up front. STM sells 20 in-app purchases, starting at $5.99 per month. JavaScript Studio Pro asks for nothing beyond the download.

STM ships an update every 2 months, JavaScript Studio Pro every 20 months. The most recent releases landed on September 25, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | STM | JavaScript Studio Pro |
| --- | --- | --- |
| Price | **Free** | $12.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/javascript-studio-pro/id1533537039/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 20 months |
| Monetization | — | Paid |
| Size | 15 MB | 33 MB |
| Requires iOS | 15.6 | **10.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Miciniti Nigeria Ltd](https://appshunter.io/developer/889715682) | [Arrowat LLC](https://appshunter.io/developer/1358562640) |

## What reviewers say

### STM

[App page](https://appshunter.io/ios/app/stm-screentime-manager/id1447876325)

**In-app purchases (20)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Personal Month (3 screens) | $5.99 | per month |
| Personal Year (1 screen) | $19.99 | per year |
| Personal Year (2 screens) | $39.99 | per year |
| Professional Year (1 screen) | $49.99 | per year |
| Personal Year (3 screens) | $59.99 | per year |
| Enterprise Year (1 screen) | $99.99 | per year |
| Professional Year (2 screens) | $99.99 | per year |
| Professional Year (3 screens) | $149.99 | per year |
| Enterprise Year (2 screen) | $199.99 | per year |
| Enterprise Year (1 screen) | $299.99 | per year |
| Personal Plan (1 month) | $4.99 | one-time |
| Personal Plan (3 months) | $14.99 | one-time |
| Professional Plan (1 month) | $14.99 | one-time |
| Personal Plan (6 months) | $29.99 | one-time |
| Professional Plan (3 months) | $44.99 | one-time |
| Personal Plan (1 year) | $59.99 | one-time |
| Professional Plan (6 months) | $89.99 | one-time |
| PERSONAL_YEAR_IOS_2 | $119.99 | one-time |
| Professional Plan (1 year) | $149.99 | one-time |
| Professional Plan (2 years) | $299.99 | one-time |


### 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


## Frequently asked questions

### Is STM free?

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

### Is JavaScript Studio Pro free?

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

### Do STM or JavaScript Studio Pro have ads?

Neither STM nor JavaScript Studio Pro shows ads.

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

STM ships an update every 2 months, and JavaScript Studio Pro every 20 months. Most recently, STM was updated on September 25, 2026 and JavaScript Studio Pro on September 29, 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.*