# ThinkDiag+ vs TopScan VAG

The clearest difference is rating: ThinkDiag+ at 4.5 against TopScan VAG's 2.6. ThinkDiag+ also leads on ratings volume (4.4K vs 8) and review sentiment (74% vs 50%). TopScan VAG's advantage is monetization model (free vs free with in-app purchases). 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.

ThinkDiag+ holds the better App Store score, 4.5 against 2.6. That said, the two scores are not equally well evidenced: ThinkDiag+ has 4.4K ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 74% of ThinkDiag+'s written reviews are positive against 50% of TopScan VAG's.

ThinkDiag+ ships an update every 3 weeks, TopScan VAG every 3 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ThinkDiag+ | TopScan VAG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4.4K ratings)](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979/reviews)** | [2.6 (8 ratings)](https://appshunter.io/ios/app/topscan-vag/id6615073467/reviews) |
| Number of ratings | **4.4K** | 8 |
| Positive reviews | **74.1% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 539 MB | 1.8 GB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [THINKCAR INC](https://appshunter.io/developer/1464847379) | [HK TOPDON TECHNOLOGY Co., LIMITED](https://appshunter.io/developer/1846276192) |

## 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


### TopScan VAG

[App page](https://appshunter.io/ios/app/topscan-vag/id6615073467)

This app transforms your phone into a powerful car diagnostic tool for Volkswagen models. It offers full system diagnosis, bi-directional controls, and special maintenance functions. Connects wirelessly via Bluetooth for easy vehicle identification and detailed reports.

**Highlights:** Full system diagnosis, Bi-directional controls, Special maintenance functions, AutoVIN vehicle identification, Wireless Bluetooth 5.0 connection, Diagnostic report generation

**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 TopScan VAG free?

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

### Which has better reviews, ThinkDiag+ or TopScan VAG?

ThinkDiag+ is rated higher. ThinkDiag+ averages 4.5 out of 5 from 4.4K ratings, while TopScan VAG averages 2.6 from 8 ratings.

### Do ThinkDiag+ or TopScan VAG have ads?

Neither ThinkDiag+ nor TopScan VAG shows ads.

### Which is updated more often, ThinkDiag+ or TopScan VAG?

ThinkDiag+ ships an update every 3 weeks, and TopScan VAG every 3 months. Most recently, ThinkDiag+ was updated on October 29, 2026 and TopScan VAG on October 25, 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.*