# ThinkDiag+ vs TuningBase

The clearest difference is rating: TuningBase at 5.0 against ThinkDiag+'s 4.5. TuningBase also leads on monetization model (free vs free with in-app purchases) and update cadence (every 6 days vs every 3 weeks). ThinkDiag+'s advantage is ratings volume (4.3K vs 1) and iOS requirement (12.0 vs 15.1). 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.

TuningBase 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 1, so its average is the more settled of the two.

ThinkDiag+ ships an update every 3 weeks, TuningBase every 6 days. The most recent releases landed on September 25, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | ThinkDiag+ | TuningBase |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (4.3K ratings)](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tuningbase/id6753321902/reviews)** |
| Number of ratings | **4.3K** | 1 |
| Positive reviews | 73.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 539 MB | 32 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [THINKCAR INC](https://appshunter.io/developer/1464847379) | [Niko Holm](https://appshunter.io/developer/1843472333) |

## What reviewers say

### 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


### TuningBase

[App page](https://appshunter.io/ios/app/tuningbase/id6753321902)

Access a comprehensive mobile database for automotive professionals and tuners. Quickly find ECUs for any vehicle, view performance data, and look up error codes. Supports multiple languages and includes a performance calculator.

**Highlights:** ECU Search by vehicle details, Original and tuning performance data, Bosch Part Number Search, DTC Error Code lookup, HP to kW conversion calculator, Multilingual support

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

**In-app purchases:** none


## Frequently asked questions

### Is ThinkDiag+ free?

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

### Is TuningBase free?

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

### Which has better reviews, ThinkDiag+ or TuningBase?

TuningBase is rated higher. ThinkDiag+ averages 4.5 out of 5 from 4.3K ratings, while TuningBase averages 5.0 from 1 ratings.

### Do ThinkDiag+ or TuningBase have ads?

Neither ThinkDiag+ nor TuningBase shows ads.

### Which is updated more often, ThinkDiag+ or TuningBase?

ThinkDiag+ ships an update every 3 weeks, and TuningBase every 6 days. Most recently, ThinkDiag+ was updated on September 25, 2026 and TuningBase on September 12, 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.*