Comparison

ThinkDiag+ vs TopGuru

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

TopGuru

Transform your phone or tablet into a powerful vehicle diagnostic tool via Bluetooth. Access full system diagnosis, OBDII functions, bi-directional controls, and essential maintenance services for a wide range of car brands. Generate detailed diagnostic reports for efficient troubleshooting.

Highlights
  • Full System Diagnosis
  • Full OBD2 Functions
  • Bi-directional Control
  • 8 Special Maintenance Functions
  • AutoVIN Vehicle Identification
  • Diagnostic Report Generation
  • Wireless Bluetooth 5.0 Connection
Features
Read full description

Easily link the app with your Phone or Tablet using Bluetooth, transforming your devices into a smart and high-powered diagnostic tool! Packed with essential features like complete OBDII functionality, all system diagnosis, Bi-Directional controls, AutoVIN, automatic diagnostic reports, and more, this Bluetooth OBDII scan tool is a must-have for technicians. Its versatility shines through with eight 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, Gateway, 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. Bi-directional Control: Easily locate issues with active tests. 4. 8 Special Functions: Perform Oil Reset, Throttle Adaptation, EPB Reset, BMS Reset, and more. 5. Repair Data Library: Includes DTC Repair Guide, Technical Service Bulletin, DLC Location, Warning Light Library. 6. AutoVIN: Enables automatic vehicle identification for quick diagnosis. 7. Wireless Connection: Utilizes Bluetooth 5.0 with a range of 33 feet/10m. 8. Graphs, Values, and Dashboard-like Data Display: Ensures easy interpretation of information. 9. Generate Diagnostic Reports: Obtain detailed reports for Systems, Fault Codes, or Data Streams. 10. Pro version features 13 reset functions and IMMO capability. Terms of Use (EULA): https://plat.topdon.com/topdon-plat/out-user/baseinfo/template/getHtmlContentById?softCode=TopScan_DisplaySW_iOS&language=7&type=25

Screenshots

ThinkDiag+4 screens
TopGuru4 screens

Verdict

The call

The clearest difference is review sentiment: ThinkDiag+ at 74% against TopGuru's 29%. ThinkDiag+ also leads on rating (4.5 vs 3.5) and in-app purchases (none vs 29). TopGuru's advantage is chart position (#189 vs unranked). 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. TopGuru sells 20 in-app purchases, starting at $9.99 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 3.5. That said, the two scores are not equally well evidenced: ThinkDiag+ has 4.3K ratings behind it against 404, 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 29% of TopGuru'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.

Scorecard5 real differences · 6 level
ThinkDiag+ versus TopGuru: the parameters behind the verdict, then further details
ParameterThinkDiag+TopGuru
PriceFreeFree
Rating4.5 (4.3K ratings) — better3.5 (404 ratings)
Positive reviews73.6% of reviews — better29.3% of reviews
Number of ratings4.3K — better404
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#189 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.011.0 — better
Further details — not scored
Size539 MB2.2 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%

TopGuru

All ratings404 ratings
Positive60.4%
Neutral8.4%
Negative31.2%
Written reviews188 reviews
Positive29.3%
Neutral13.3%
Negative57.4%

User reviews

ThinkDiag+

From 4.3K App Store ratings

What we love

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

Room to improve

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

TopGuru

From 404 App Store ratings

What we love

  • 👍 Works well on most vehicles
  • 🚀 Powerful features for the price
  • 💡 Useful for DIY and professional mechanics

Room to improve

  • 🐛 Frequent app crashes and bugs
  • ⏱️ Slow and cumbersome to use due to constant updates
  • 🔒 Concerns about data privacy and security
  • 💰 Subscription model after initial purchase

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

TopGuru

Reported bugs

3 issues
  • Incompatibility with certain vehicle models
  • Login and account issues
  • Unreliable Bluetooth connectivity

Requested features

3 requests
  • iPad optimization and full-screen support
  • Expanded vehicle coverage, especially for motorcycles
  • Ability to save and export diagnostic data

In-app purchases

None

ThinkDiag+

No in-app purchases

20 purchases

TopGuru

Subscriptions5
  • Monthly Auto-renewal$9.991 Month
  • Monthly Auto-renewal$19.001 Month
  • Quarterly Auto-renewal$24.993 Months
Show 2 more
  • Annual Auto-renewal$49.991 Year
  • Annual Auto-renewal$99.001 Year
One-time15
  • Diag Bundle Renewal3 variants$49.99
  • TopGuru Diagnostic Bundle$49.99
  • TopGuru IMMO Bundle$49.99
Show 12 more
  • Renewal Bundle4 variants$99.00
  • TopScan Pro Renewal Bundle3 variants$99.00
  • Harley Moto Software$99.99
  • Harley Moto Software Renewal$99.99
  • Moto Diag Bundle Renewal-Moto$99.99
  • Moto Diag Bundle$99.99
  • Moto Diag Bundle Renewal$99.99
  • 22 Special Functions Bundle2 variants$129.99
  • Renault Gateway 10 Tokens$129.99
  • Renault Gateway 5 Tokens$147.99
  • 17 Special Functions Bundle2 variants$179.00
  • FCA Gateway 1-year (EU only)$229.99

Questions

Is ThinkDiag+ free?
ThinkDiag+ is free to download, with no in-app purchases.
Is TopGuru free?
TopGuru is free to download, with in-app purchases available.
Which has better reviews, ThinkDiag+ or TopGuru?
ThinkDiag+ is rated higher. ThinkDiag+ averages 4.5 out of 5 from 4.3K ratings, while TopGuru averages 3.5 from 404 ratings.
Do ThinkDiag+ or TopGuru have ads?
Neither ThinkDiag+ nor TopGuru shows ads.
Which is updated more often, ThinkDiag+ or TopGuru?
ThinkDiag+ ships an update every 3 weeks, and TopGuru every 3 weeks. Most recently, ThinkDiag+ was updated on September 22, 2026 and TopGuru on September 23, 2026.

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