# Ultra Boost vs ThinkDiag+

The clearest difference is rating: Ultra Boost at 5.0 against ThinkDiag+'s 4.5. Ultra Boost also leads on review sentiment (100% vs 74%) and monetization model (free vs free with in-app purchases). ThinkDiag+'s advantage is ratings volume (4.3K vs 4) and update cadence (every 3 weeks vs every 2 months). 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.

Ultra Boost holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: ThinkDiag+ has 4.3K ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of Ultra Boost's written reviews are positive against 74% of ThinkDiag+'s.

Ultra Boost ships an update every 2 months, ThinkDiag+ every 3 weeks. The most recent releases landed on October 8, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Ultra Boost | ThinkDiag+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/ultra-boost/id1471601228/reviews)** | [4.5 (4.3K ratings)](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979/reviews) |
| Number of ratings | 4 | **4.3K** |
| Positive reviews | **100.0% of reviews** | 74.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 81 MB | 539 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [ECU=SHOP](https://appshunter.io/developer/1389703440) | [THINKCAR INC](https://appshunter.io/developer/1464847379) |

## What reviewers say

### Ultra Boost

[App page](https://appshunter.io/ios/app/ultra-boost/id1471601228)

This application allows users to wirelessly adjust fuel supply and monitor engine performance metrics like RPM, boost, and speed. It offers four operating modes, including an AI mode, to optimize engine output and increase horsepower.

**Highlights:** Wireless fuel supply adjustment, RPM, boost, and speed display, Four operating modes with AI, Monitor oil pressure and air flow, GPS speed and weather data

**Features:** Vision Pro support

**In-app purchases:** none


### ThinkDiag+

[App page](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979)

This app provides professional-level vehicle diagnostics, offering features like reading/clearing fault codes, data flow analysis, and special maintenance functions. It supports a wide range of car brands and allows users to subscribe to specific diagnostic software. Connects via Bluetooth to your smartphone for intelligent vehicle analysis.

**Highlights:** OE-level diagnostic functions, Full OBD II diagnosis, Special maintenance functions, Supports 100+ vehicle brands, Automatic VIN reading, Professional diagnostic reports, In-app user community

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 🚀 Powerful diagnostic capabilities
- 🚀 Affordable price
- 🚀 Helpful customer support
- 🚀 Versatile for DIY and professionals

**What reviewers complain about**

- 🐛 Occasional crashes or freezes
- 🐛 Compatibility issues with certain vehicles
- 🔒 Concerns about annual subscription fees
- 🔒 Limited functionality on iOS devices

**Reported bugs**

- Failure to recognize VIN or vehicle information
- Inability to clear certain error codes
- Inconsistent performance across different devices

**Requested features**

- Improved user interface and navigation
- More detailed troubleshooting guides
- Expanded vehicle coverage and special functions
- Offline mode for diagnostics


## Frequently asked questions

### Is Ultra Boost free?

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

### Is ThinkDiag+ free?

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

### Which has better reviews, Ultra Boost or ThinkDiag+?

Ultra Boost is rated higher. Ultra Boost averages 5.0 out of 5 from 4 ratings, while ThinkDiag+ averages 4.5 from 4.3K ratings.

### Do Ultra Boost or ThinkDiag+ have ads?

Neither Ultra Boost nor ThinkDiag+ shows ads.

### Which is updated more often, Ultra Boost or ThinkDiag+?

Ultra Boost ships an update every 2 months, and ThinkDiag+ every 3 weeks. Most recently, Ultra Boost was updated on October 8, 2026 and ThinkDiag+ on October 16, 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.*