# Ultra Boost Piezo vs Convert Rai

The clearest difference is price: Ultra Boost Piezo at Free against Convert Rai's $0.99. Ultra Boost Piezo also leads on iOS requirement (11.0 vs 13.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Ultra Boost Piezo is free to download; Convert Rai costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Ultra Boost Piezo ships an update fortnightly, Convert Rai every 4 weeks. The most recent releases landed on October 20, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Ultra Boost Piezo | Convert Rai |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/ultra-boost-piezo/id1579264665/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 weeks |
| Monetization | Free | — |
| Size | 80 MB | 17 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ECU=SHOP](https://appshunter.io/developer/1389703440) | [Khanin Chomphusri](https://appshunter.io/developer/1657583243) |

## What reviewers say

### Ultra Boost Piezo

[App page](https://appshunter.io/ios/app/ultra-boost-piezo/id1579264665)

This application allows users to wirelessly adjust fuel supply and monitor engine performance metrics like RPM, boost, and speed via a mobile phone. It features an AI mode for automatic operation adjustments and offers a tangible price point for increased horsepower.

**Highlights:** Wireless fuel adjustment, RPM and boost display, AI automatic operation mode, Monitor oil pressure, GPS speed display, Weather and air pressure data

**Features:** macOS Compatibility

**In-app purchases:** none


### Convert Rai

[App page](https://appshunter.io/ios/app/convert-rai/id6444877065)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ultra Boost Piezo free?

Ultra Boost Piezo is free to download, with no in-app purchases.

### Is Convert Rai free?

Convert Rai costs $0.99, with no in-app purchases.

### Do Ultra Boost Piezo or Convert Rai have ads?

Neither Ultra Boost Piezo nor Convert Rai shows ads.

### Which is updated more often, Ultra Boost Piezo or Convert Rai?

Ultra Boost Piezo ships an update fortnightly, and Convert Rai every 4 weeks. Most recently, Ultra Boost Piezo was updated on October 20, 2026 and Convert Rai on October 27, 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.*