# Engine Performance Booster vs Jacfit Device

The clearest difference is update cadence: Jacfit Device at weekly against Engine Performance Booster's every 10 months. Engine Performance Booster's advantage is iOS requirement (10.0 vs 15.6). 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.

Engine Performance Booster ships an update every 10 months, Jacfit Device weekly. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Engine Performance Booster | Jacfit Device |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/jacfit-device/id6746643211/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Weekly** |
| Monetization | — | Free |
| Size | 21 MB | 2 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [StarRiver Digital Design Co. Ltd.](https://appshunter.io/developer/993138472) | [JSPORTS TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1453347979) |

## What reviewers say

### Engine Performance Booster

[App page](https://appshunter.io/ios/app/engine-performance-booster/id1619610828)

**Features:** macOS Compatibility

**In-app purchases:** none


### Jacfit Device

[App page](https://appshunter.io/ios/app/jacfit-device/id6746643211)

This application connects to specific devices to manage their firmware. It ensures your connected products are always running the latest software for optimal performance and a smooth user experience.

**Highlights:** Firmware updates, Device management, Performance optimization, User experience enhancement, Keep devices up to date

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

**In-app purchases:** none


## Frequently asked questions

### Is Engine Performance Booster free?

Engine Performance Booster is free to download, with no in-app purchases.

### Is Jacfit Device free?

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

### Do Engine Performance Booster or Jacfit Device have ads?

Neither Engine Performance Booster nor Jacfit Device shows ads.

### Which is updated more often, Engine Performance Booster or Jacfit Device?

Engine Performance Booster ships an update every 10 months, and Jacfit Device weekly. Most recently, Engine Performance Booster was updated on October 7, 2026 and Jacfit Device on October 3, 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.*