# Run Custom JS on Background — Always run custom JavaScript.

> Always run custom JavaScript. (iPhone/iPad app by Takada Hiroki.)

- Source: https://appshunter.io/ios/app/run-custom-js-on-background/id6755627440 (this page in markdown: same URL + `.md`)
- Developer: [Takada Hiroki](https://appshunter.io/developer/1847165450)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: American English
- Released: 2026-01-12
- Data updated: 2026-07-17
- User reviews in markdown: https://appshunter.io/ios/app/run-custom-js-on-background/id6755627440/reviews.md

## What is Run Custom JS on Background?

・Runs custom JavaScript code continuously in Safari
・Supports a wide range of functions, including automatic bookmarklet execution, ad blocking, and automation.
・Easily paste code using the Paste button
・Supports import and export. You can instantly transfer your settings to other devices.


## Version history (last 2 releases)

### 1.1 — 2026-04-27

We have implemented import and export functionality. You can now instantly transfer codes registered on other devices.

### 1.0 — 2026-01-12

No release notes.

## More apps by Takada Hiroki

- [TimerLog](https://appshunter.io/ios/app/timerlog/id6754220669)
- [1TapCopy](https://appshunter.io/ios/app/1tapcopy/id6761337941)

All apps by Takada Hiroki: https://appshunter.io/developer/1847165450

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*