# iPennyVibration vs Run Custom JS on Background

iPennyVibration and Run Custom JS on Background are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | iPennyVibration | Run Custom JS on Background |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 4 months |
| Size | 2 MB | 1 MB |
| Requires iOS | **16.1** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [PoChun Chang](https://appshunter.io/developer/1620672722) | [Takada Hiroki](https://appshunter.io/developer/1847165450) |

## What reviewers say

### iPennyVibration

[App page](https://appshunter.io/ios/app/ipennyvibration/id1668529628)

**In-app purchases:** none


### 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


## Frequently asked questions

### Is iPennyVibration free?

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

### Is Run Custom JS on Background free?

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

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

Neither iPennyVibration nor Run Custom JS on Background shows ads.

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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.*