# Run Custom JS on Background vs ClauseCheck

The clearest difference is update cadence: ClauseCheck at every 6 days against Run Custom JS on Background's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Run Custom JS on Background ships an update every 4 months, ClauseCheck every 6 days. The most recent releases landed on September 11, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Run Custom JS on Background | ClauseCheck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 days** |
| Size | 1 MB | 31 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Takada Hiroki](https://appshunter.io/developer/1847165450) | [涛 刘](https://appshunter.io/developer/6785269438) |

## What reviewers say

### Run Custom JS on Background

[App page](https://appshunter.io/ios/app/run-custom-js-on-background/id6755627440)

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

**In-app purchases:** none


### ClauseCheck

[App page](https://appshunter.io/ios/app/clausecheck-contract-diff/id6788023174)

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

**In-app purchases:** none


## Frequently asked questions

### Is Run Custom JS on Background free?

Run Custom JS on Background is free to download, with no in-app purchases.

### Is ClauseCheck free?

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

### Do Run Custom JS on Background or ClauseCheck have ads?

Neither Run Custom JS on Background nor ClauseCheck shows ads.

### Which is updated more often, Run Custom JS on Background or ClauseCheck?

Run Custom JS on Background ships an update every 4 months, and ClauseCheck every 6 days. Most recently, Run Custom JS on Background was updated on September 11, 2026 and ClauseCheck on September 18, 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.*