Comparison

ThinkDiag+ vs DFirstCoder

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

DFirstCoder

This app provides comprehensive vehicle diagnostics and customization for car owners. It offers one-click app features for easy operation, Bluetooth connectivity, and the ability to read/clear trouble codes, perform smog checks, and view live data. It supports a wide range of vehicle models.

Highlights
  • One-click apps for easy operation
  • Comprehensive diagnostic features
  • Bluetooth wireless connectivity
  • Read and clear trouble codes
  • Smog check functionality
  • Live data display
  • Supports VAG, BMW, Mercedes-Benz models
Features
Read full description

DFirstCoder is an equipped with one-click apps feature professional OBDII Scanner App, designed for vehicle users who want to go beyond straightforward diagnostics. It includes comprehensive diagnostic features and customize numerous features of your vehicles with one-click, friendly to use even for beginners. Features: 1.2 in 1 OBDII coder. In addition to comprehensive diagnostic, one-click apps eliminate the need for tedious operation steps, making them easy to understand and operate, even for beginners. 2.Hot update. Updating the features or fixing bugs immediately without needing to update the app, it can respond to users needs and resolve functionality issue quickly. 3.Bluetooth connectivity, DFirstCoder's device supports wireless connection to your phone or tablet , and communicate with your vehicles rapidly. 4.Read & Clear codes, read the trouble codes of your vehicle and clear it. 5.Smog check. 6.MIL status. 7.Live data. 8.Freeze frame. 9.Mode 6 10.Covering a wide range of models, VAG Group, BMW Group, Mercedes-Benz, etc. are available. About DFirstCoder Information ———————————————————————————————————————————————————————————————————————————————————— DFirstCoder is an app to adapt DFirst device, owner of Shenzhen QIXIN Technology Co., LTD. It’s equipped with one-click apps and comprehensive diagnostic features. The app is free to download for user, and some of functions are free to use (e.g. clear temporary trouble codes,date-time synchronization and host reboot etc.). For more details, welcome to follow us, Website:www.dfirstcoder.com Facebook:https://www.facebook.com/qixinglobal Email: support@dfirstcoder.com Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ThinkDiag+4 screens
DFirstCoder3 screens

Verdict

The call

The clearest difference is in-app purchases: ThinkDiag+ at none against DFirstCoder's 8. ThinkDiag+ also leads on ratings volume (4.3K vs 5). DFirstCoder's advantage is rating (4.8 vs 4.5). On price, review sentiment, update cadence and ads 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. DFirstCoder sells 8 in-app purchases, starting at $108.99 per year. ThinkDiag+ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

DFirstCoder holds the better App Store score, 4.8 against 4.5. That said, the two scores are not equally well evidenced: ThinkDiag+ has 4.3K ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 74% of ThinkDiag+'s written reviews are positive against 67% of DFirstCoder's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 25, 2026 and September 6, 2026 respectively.

Scorecard3 real differences · 7 level
ThinkDiag+ versus DFirstCoder: the parameters behind the verdict, then further details
ParameterThinkDiag+DFirstCoder
PriceFreeFree
Rating4.5 (4.3K ratings)4.8 (5 ratings) — better
Positive reviews73.6% of reviews — better66.7% of reviews
Number of ratings4.3K — better5
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 iOS12.0 — better13.0
Further details — not scored
Size539 MB94 MB
Age rating17+17+
DeveloperTHINKCAR INCShenzhen QiXin Technology Co., Ltd.

Customer experience

ThinkDiag+

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

DFirstCoder

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

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

DFirstCoder

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

ThinkDiag+

No in-app purchases

8 purchases

DFirstCoder

Subscriptions2
  • Pro Plan Subscription$108.991 Year
  • Pro Plan Subscription (Family)$158.991 Year
One-time6
  • 350 QD$4.99
  • 700 QD$9.95
  • 1400 QD$19.49
Show 3 more
  • 3500 QD$49.99
  • 7000 QD$96.99
  • 10500 QD$145.99

Questions

Is ThinkDiag+ free?
ThinkDiag+ is free to download, with no in-app purchases.
Is DFirstCoder free?
DFirstCoder is free to download, with in-app purchases available.
Which has better reviews, ThinkDiag+ or DFirstCoder?
DFirstCoder is rated higher. ThinkDiag+ averages 4.5 out of 5 from 4.3K ratings, while DFirstCoder averages 4.8 from 5 ratings.
Do ThinkDiag+ or DFirstCoder have ads?
Neither ThinkDiag+ nor DFirstCoder shows ads.
Which is updated more often, ThinkDiag+ or DFirstCoder?
ThinkDiag+ ships an update every 3 weeks, and DFirstCoder every 3 weeks. Most recently, ThinkDiag+ was updated on September 25, 2026 and DFirstCoder on September 6, 2026.

Other comparisons