---
title: "Run Custom JS on Background - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "・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 butt"
---

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

![Run Custom JS on Background App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/08/d0/71/08d07162-3fe8-a57c-db67-6b56b78017de/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Takada Hiroki](https://apptail.io/developer/takada-hiroki-Gvnlhc)
**Category:** Utilities
**Rating:** 4.0/5 (0 ratings)
**Price:** Free
**Bundle ID:** Hiroki-Takada.Run-Custom-JS-on-Background
**Store:** Apple App Store
**Country:** United States
**Version:** 1.1 (released 2026-04-27)
**Original Release:** 2026-01-12
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6755627440)
**AppTail Page:** [https://apptail.io/app/run-custom-js-on-background-xCHz/united-states](https://apptail.io/app/run-custom-js-on-background-xCHz/united-states)

## Run Custom JS on Background Description
・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.

## Run Custom JS on Background Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/d4/bd/1c/d4bd1cf3-18ea-9754-ad4b-97e0952b3bd2/Simulator_Screenshot_-_iPhone_17_-_2026-04-26_at_13.56.57.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e5/8b/ca/e58bca81-f563-7907-eeea-2045bb209cad/Simulator_Screenshot_-_iPhone_17_-_2026-04-26_at_13.57.00.png/1242x2688.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/18/ca/22/18ca221b-cc6d-bcb4-a750-547081f57685/Simulator_Screenshot_-_iPhone_17_-_2026-04-26_at_13.57.44.png/1242x2688.png)






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## Run Custom JS on Background Available In
- [Australia](https://apptail.io/app/run-custom-js-on-background-xCHz/australia)
- [Belgium](https://apptail.io/app/run-custom-js-on-background-xCHz/belgium)
- [Canada](https://apptail.io/app/run-custom-js-on-background-xCHz/canada)
- [Switzerland](https://apptail.io/app/run-custom-js-on-background-xCHz/switzerland)
- [China](https://apptail.io/app/run-custom-js-on-background-xCHz/china)
- [Germany](https://apptail.io/app/run-custom-js-on-background-xCHz/germany)
- [Spain](https://apptail.io/app/run-custom-js-on-background-xCHz/spain)
- [France](https://apptail.io/app/run-custom-js-on-background-xCHz/france)
- [United Kingdom](https://apptail.io/app/run-custom-js-on-background-xCHz/united-kingdom)
- [Hungary](https://apptail.io/app/run-custom-js-on-background-xCHz/hungary)
- [Israel](https://apptail.io/app/run-custom-js-on-background-xCHz/israel)
- [Italy](https://apptail.io/app/run-custom-js-on-background-xCHz/italy)
- [Jordan](https://apptail.io/app/run-custom-js-on-background-xCHz/jordan)
- [Japan](https://apptail.io/app/run-custom-js-on-background-xCHz/japan)
- [Kenya](https://apptail.io/app/run-custom-js-on-background-xCHz/kenya)
- [Malta](https://apptail.io/app/run-custom-js-on-background-xCHz/malta)
- [Nigeria](https://apptail.io/app/run-custom-js-on-background-xCHz/nigeria)
- [Oman](https://apptail.io/app/run-custom-js-on-background-xCHz/oman)
- [Philippines](https://apptail.io/app/run-custom-js-on-background-xCHz/philippines)
- [Poland](https://apptail.io/app/run-custom-js-on-background-xCHz/poland)
- [Qatar](https://apptail.io/app/run-custom-js-on-background-xCHz/qatar)
- [Romania](https://apptail.io/app/run-custom-js-on-background-xCHz/romania)
- [Russia](https://apptail.io/app/run-custom-js-on-background-xCHz/russia)
- [Slovenia](https://apptail.io/app/run-custom-js-on-background-xCHz/slovenia)
- [Slovakia](https://apptail.io/app/run-custom-js-on-background-xCHz/slovakia)
- [Senegal](https://apptail.io/app/run-custom-js-on-background-xCHz/senegal)
- [Suriname](https://apptail.io/app/run-custom-js-on-background-xCHz/suriname)
- [Thailand](https://apptail.io/app/run-custom-js-on-background-xCHz/thailand)
- [Taiwan](https://apptail.io/app/run-custom-js-on-background-xCHz/taiwan)
- [Uganda](https://apptail.io/app/run-custom-js-on-background-xCHz/uganda)
- [United States](https://apptail.io/app/run-custom-js-on-background-xCHz/united-states)
- [Uzbekistan](https://apptail.io/app/run-custom-js-on-background-xCHz/uzbekistan)

---

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