Comparison

ThinkDiag+ vs TopScan VAG

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ThinkDiag+

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
Read full description

1. Profession functions refer to OE level functions, such as read/clear code, data flow diagram, read ECU, drive test, bidirectional special functions, etc. 2. Support full-function OBD II diagnosis, read data flow, freeze frame read IM/real-time data, read/clear fault code, vehicle on-board monitoring/computer system control operation and read vehicle information. 3. Support vehicle maintenance light return to normal. 4. Select any vehicle diagnostic software, covering up to 39 major automobile manufacturers. 5. Support automatic VIN reading and one-key diagnosis. 6. Clear interpretation of fault codes and generate professional diagnostic reports. 7. Be able to communicate with other users within the ThinkDiag community (share/help/support). Not only for "ThinkDiag" and "ThinkDiag 2" device, but also works for "ThinkDiag Mini", "ThinkDirver", and "Thinkcar Pro" devices. ThinkDiag, an innovative vehicle diagnostic tool, is specially designed for repair technicians, small and medium-sized repair shops, and DIYers, to achieve the original manufacturer level diagnostic performance. It supports more than 100 vehicle brands of diagnostic services, including 15 special maintenance reset functions. ThinkDiag is as good as those comprehensive diagnostic equipment costed thousands of dollars. ThinkDiag is also an intelligent diagnostic device. Connecting with smartphone via Bluetooth, it is controlled to work by app. In the app, there is a diagnostic software store, and users can subscribe for diagnostic software according to their needs. ***Contact Us W: www.mythinkcar.com E: service@mythinkcar.com P: +1 833-692-2766 2151 S Haven Ave Unit 203 Ontario CA 91761 USA

About

TopScan VAG

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
Read full description

TopScan VAG APP is specially designed for Volkswagen models. Connect the TopScan VAG to your Phone via Bluetooth and turn your devices into a smart and powerful diagnostic tool! The Bluetooth OBDII scan tool is loaded with essential features such as full OBDII functionality, full system diagnosis, bi-directional controls, autoVIN, automatic diagnostic reports, and more. Maintenance service functions and coverage for 100+ vehicle brands make the Topscan a versatile and portable auto scanner for technicians. Key Features: 1. Full-system diagnosis: Engine, Transmission, Airbag, ABS, ESP, TPMS, Immobilizer, Gateway, Steering, Radio, Air Conditioning and more. 2. All-system diagnostic basic functions: access ECU info, read fault codes, clear fault codes, read data stream. 3. Special functions: Oil reset, throttle adaptation, EPB reset, BMS reset, and more. 4. Bi-directional control to target problems easily. 4. AutoVIN for automatic vehicle identification and quick diagnosis. 5. Wireless connection, Bluetooth 5.0 with a range of 33 feet/10m. Works on iOS 11.0 or above, compact and portable. 6. Repair data library: DTC repair guide, technical service bulletin, DLC location, warning light library. 7. Graph, value and dashboard-like data display for easy interpretation.  8. Generate diagnostic reports for system, fault Codes, or data streams. 9. Feedback function enables users to submit issues and requests to us in a convenient way.

Screenshots

ThinkDiag+4 screens
TopScan VAG4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
ThinkDiag+ versus TopScan VAG: the parameters behind the verdict, then further details
ParameterThinkDiag+TopScan VAG
PriceFreeFree
Rating4.5 (4.4K ratings) — better2.6 (8 ratings)
Positive reviews74.1% of reviews — better50.0% of reviews
Number of ratings4.4K — better8
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size539 MB1.8 GB
Age rating17+4+
DeveloperTHINKCAR INCHK TOPDON TECHNOLOGY Co., LIMITED

Customer experience

ThinkDiag+

All ratings4,308 ratings
Positive88.1%
Neutral2.7%
Negative9.2%
Written reviews278 reviews
Positive74.1%
Neutral2.5%
Negative23.4%

TopScan VAG

All ratings8 ratings
Positive37.5%
Neutral0.0%
Negative62.5%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Bugs and requests

ThinkDiag+

Reported bugs

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

Requested features

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

TopScan VAG

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

ThinkDiag+

No in-app purchases

None

TopScan VAG

No in-app purchases

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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