Comparison

ThinkDiag+ vs TOPDON CarPal

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

TOPDON CarPal

Transform your phone into a powerful car diagnostic tool with this app. It offers comprehensive system scans, full OBDII functionality, and specialized maintenance services for a wide range of vehicle brands. Easily identify issues, access repair data, and generate detailed reports wirelessly.

Highlights
  • Full System Diagnosis
  • Full OBD2 Functions
  • 6 Special Maintenance Functions
  • AutoVIN Vehicle Identification
  • Wireless Bluetooth Connection
  • Diagnostic Report Generation
Features
Read full description

Easily link the app with your Phone using Bluetooth, transforming your devices into a smart and high-powered diagnostic tool! Packed with essential features like complete OBDII functionality, all system diagnosis, AutoVIN, automatic diagnostic reports, and more, this Bluetooth OBDII scan tool is a must-have for your car. Its versatility shines through with 6 maintenance service functions and coverage for over 60 vehicle brands, making the product a portable and adaptable auto scanner. Main Features: 1. Full System Diagnosis: Covers Engine, Transmission, Airbag, ABS, ESP, TPMS, Immobilizer, Steering, Radio, Air Conditioning, and more. 2. Full OBD2 Functions: works as an OBD2 code reader and performs all 10 modes of OBD2 testing free for life. 3. 6 Special Functions: Perform Oil Reset, Throttle Adaptation, EPB Reset, BMS Reset, and more. 4. Repair Data Library: Includes DTC Repair Guide, Technical Service Bulletin, DLC Location, Warning Light Library. 5. AutoVIN: Enables automatic vehicle identification for quick diagnosis. 6. Wireless Connection: Utilizes Bluetooth 5.0 with a range of 33 feet/10m. 7. Graphs, Values, and Dashboard-like Data Display: Ensures easy interpretation of information. 8. Generate Diagnostic Reports: Obtain detailed reports for Systems, Fault Codes, or Data Streams. Terms of Use (EULA): https://plat.topdon.com/topdon-plat/out-user/baseinfo/template/getHtmlContentById?softCode=Car_Pal_DisplaySW_iOS&language=7&type=25

Screenshots

ThinkDiag+4 screens
TOPDON CarPal4 screens

Verdict

The call

The clearest difference is rating: ThinkDiag+ at 4.5 against TOPDON CarPal's 3.7. ThinkDiag+ also leads on in-app purchases (none vs 18) and review sentiment (74% vs 39%). On price, update cadence, ads and monetization model 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. TOPDON CarPal sells 18 in-app purchases, starting at $4.99 per month. ThinkDiag+ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ThinkDiag+ holds the better App Store score, 4.5 against 3.7. That said, the two scores are not equally well evidenced: ThinkDiag+ has 4.3K ratings behind it against 41, 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 39% of TOPDON CarPal's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
ThinkDiag+ versus TOPDON CarPal: the parameters behind the verdict, then further details
ParameterThinkDiag+TOPDON CarPal
PriceFreeFree
Rating4.5 (4.3K ratings) — better3.7 (41 ratings)
Positive reviews73.6% of reviews — better39.3% of reviews
Number of ratings4.3K — better41
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.011 — better
Further details — not scored
Size539 MB1.6 GB
Age rating17+4+
DeveloperTHINKCAR INCHK TOPDON TECHNOLOGY Co., LIMITED

Customer experience

ThinkDiag+

All ratings4,308 ratings
Positive88.1%
Neutral2.7%
Negative9.2%
Written reviews273 reviews
Positive73.6%
Neutral2.6%
Negative23.8%

TOPDON CarPal

All ratings41 ratings
Positive65.9%
Neutral2.4%
Negative31.7%
Written reviews56 reviews
Positive39.3%
Neutral3.6%
Negative57.1%

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

TOPDON CarPal

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

ThinkDiag+

No in-app purchases

18 purchases

TOPDON CarPal

Subscriptions2
  • Monthly Auto-renewal$4.991 Month
  • Renewal Bundle$29.991 Year
One-time16
  • Nissan Gateway 1-Token$11.99
  • Renault Gateway 1-Token$11.99
  • VW SFD Gateway 1-Token$11.99
Show 13 more
  • FCA Gateway 1-Token$11.99
  • FCA Gateway 30-day Access$34.99
  • VW SFD Gateway 30-day Access$34.99
  • Renault Gateway 5 Tokens$116.99
  • Nissan Gateway 5 Tokens (EU only)$116.99
  • Renault Gateway 5 Tokens$147.99
  • VW SFD Gateway 1-year Access$199.99
  • Renault Gateway 10 Tokens$209.99
  • Nissan Gateway 10 Tokens (EU only)$209.99
  • Nissan Gateway 10 Tokens (EU only)$254.99
  • Renault Gateway 20 Tokens$379.00
  • Nissan Gateway 20 Tokens (EU only)$379.00
  • Nissan Gateway 20 Tokens (EU only)$464.99

Questions

Is ThinkDiag+ free?
ThinkDiag+ is free to download, with no in-app purchases.
Is TOPDON CarPal free?
TOPDON CarPal is free to download, with in-app purchases available.
Which has better reviews, ThinkDiag+ or TOPDON CarPal?
ThinkDiag+ is rated higher. ThinkDiag+ averages 4.5 out of 5 from 4.3K ratings, while TOPDON CarPal averages 3.7 from 41 ratings.
Do ThinkDiag+ or TOPDON CarPal have ads?
Neither ThinkDiag+ nor TOPDON CarPal shows ads.
Which is updated more often, ThinkDiag+ or TOPDON CarPal?
ThinkDiag+ ships an update every 3 weeks, and TOPDON CarPal every 3 weeks. Most recently, ThinkDiag+ was updated on September 22, 2026 and TOPDON CarPal on September 23, 2026.

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