ThinkDiag+ vs TreadEye
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
TreadEye
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App Description (Full Description) Measure tire tread depth accurately and efficiently with your smart device. This app is designed to work with professional optical tire tread depth measurement devices, helping users quickly assess tire wear, improve driving safety, and make informed maintenance decisions. Using advanced optical measurement technology, the app captures precise tread depth data in seconds. It transforms complex tire inspection into a simple, digital process suitable for workshops, fleet operators, inspectors, and safety-conscious drivers. Key Features · Accurate Tread Depth Measurement Obtain precise tire tread depth readings through optical imaging technology. · Wear Analysis and Reporting Conduct wear analysis and generate reports, providing maintenance recommendations to improve driving safety. · Fast and Easy Operation Complete measurements in seconds with a clean and intuitive interface. · Clear Visual Display Easy-to-read measurement results support faster decision-making. · Data Consistency and Reliability Optical measurement reduces human error compared to manual gauges. Why Tread Depth Matters Proper tire tread depth is essential for: · Vehicle traction and braking performance · Wet road safety and hydroplaning prevention · Compliance with safety regulations · Extending tire life and reducing operating costs This app helps users identify worn tires early and take action before safety becomes a concern. Ideal for · Automotive repair shops · Tire service centers · Fleet management companies · Vehicle inspection professionals · Safety-focused drivers Smart, Accurate, Professional By combining optical measurement hardware with intelligent software, this app delivers a modern solution for tire tread inspection. Whether used in professional environments or for regular safety checks, it provides reliable results you can trust.
Screenshots
Verdict
The clearest difference is update cadence: ThinkDiag+ at every 3 weeks against TreadEye's every 3 months. ThinkDiag+ also leads on iOS requirement (12.0 vs 15.5). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ThinkDiag+ ships an update every 3 weeks, TreadEye every 3 months. The most recent releases landed on September 29, 2026 and September 9, 2026 respectively.
| Parameter | ThinkDiag+ | TreadEye |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (4.3K ratings) — better | — |
| Positive reviews | 73.9% of reviews | — |
| Number of ratings | 4.3K — better | — |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 539 MB | 79 MB |
| Age rating | 17+ | 4+ |
| Developer | THINKCAR INC | Shenzhen Koicci Technology Co., Ltd |
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
TreadEye
Not enough reviews yet to summarise bugs or requests.
In-app purchases
ThinkDiag+
No in-app purchases
TreadEye
No in-app purchases









