# OBD2 Scanner | OBD Auto Doctor vs ThinkDiag+

OBD2 Scanner | OBD Auto Doctor and ThinkDiag+ both sit at 4.4 stars, but that hides the real split: 74% of ThinkDiag+'s written reviews are positive against 30% of OBD2 Scanner | OBD Auto Doctor's. ThinkDiag+ also leads on in-app purchases (none vs 9) and iOS requirement (12.0 vs 17.0). On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. OBD2 Scanner | OBD Auto Doctor sells 9 in-app purchases, starting at $4.99 per month. ThinkDiag+ asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.4 for OBD2 Scanner | OBD Auto Doctor against 4.5 for ThinkDiag+. Both are backed by a comparable volume of ratings — 6.2K and 4.4K respectively. Written reviews are what separate them: 30% of OBD2 Scanner | OBD Auto Doctor's written reviews are positive against 74% of ThinkDiag+'s.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | OBD2 Scanner | OBD Auto Doctor | ThinkDiag+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (6.2K ratings)](https://appshunter.io/ios/app/obd2-scanner-obd-auto-doctor/id908897183/reviews) | **[4.5 (4.4K ratings)](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979/reviews)** |
| Number of ratings | **6.2K** | 4.4K |
| Positive reviews | 30.3% of reviews | **74.1% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 539 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Creosys](https://appshunter.io/developer/908897186) | [THINKCAR INC](https://appshunter.io/developer/1464847379) |

## What reviewers say

### OBD2 Scanner | OBD Auto Doctor

[App page](https://appshunter.io/ios/app/obd2-scanner-obd-auto-doctor/id908897183)

Diagnose your car's engine light issues and monitor real-time performance data. This app allows you to read and clear diagnostic trouble codes, track fuel consumption, and view sensor data. It's a comprehensive tool for understanding your vehicle's health.

**Highlights:** Read and clear OBD2 diagnostic trouble codes (DTC), Reset Check Engine Light, Monitor real-time vehicle data and sensor readings, Track fuel consumption, Read readiness monitor status for emissions testing, Initiate service routines, Send diagnostic data via email

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly (legacy) | $4.99 | per month |
| Personal, monthly | $4.99 | per month |
| Premium, monthly | $5.99 | per month |
| Professional, monthly | $6.99 | per month |
| Yearly (legacy) | $23.99 | per year |
| Personal, yearly | $23.99 | per year |
| Professional, yearly | $29.99 | per year |
| Premium, annual | $29.99 | per year |
| OBD Auto Doctor Pro (legacy) | $29.99 | one-time |

**What reviewers like**

- 🚀 Works great
- 👍 Easy to use
- 🚀 Accurate diagnostics
- 🚀 Extensive adapter support
- 👍 Helpful for DIY mechanics

**What reviewers complain about**

- 🔒 Requires subscription for full functionality
- 🐛 Connection issues
- 🐛 Inconsistent performance
- 🐛 Doesn't work with all vehicles
- 💰 Expensive subscription

**Reported bugs**

- App crashes on launch
- Fails to detect existing fault codes
- Subscription issues and inability to cancel
- Incompatible with certain OBD2 adapters

**Requested features**

- Add support for more vehicle makes and models
- Improve Bluetooth/WiFi connectivity
- Provide more detailed diagnostic information
- Allow clearing of error codes without subscription
- Add live data dashboards and graphs


### ThinkDiag+

[App page](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979)

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:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

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

**Requested features**

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


## Frequently asked questions

### Is OBD2 Scanner | OBD Auto Doctor free?

OBD2 Scanner | OBD Auto Doctor is free to download, with in-app purchases available.

### Is ThinkDiag+ free?

ThinkDiag+ is free to download, with no in-app purchases.

### Which has better reviews, OBD2 Scanner | OBD Auto Doctor or ThinkDiag+?

ThinkDiag+ is rated higher. OBD2 Scanner | OBD Auto Doctor averages 4.4 out of 5 from 6.2K ratings, while ThinkDiag+ averages 4.5 from 4.4K ratings.

### Do OBD2 Scanner | OBD Auto Doctor or ThinkDiag+ have ads?

Neither OBD2 Scanner | OBD Auto Doctor nor ThinkDiag+ shows ads.

### Which is updated more often, OBD2 Scanner | OBD Auto Doctor or ThinkDiag+?

OBD2 Scanner | OBD Auto Doctor ships an update every 3 weeks, and ThinkDiag+ every 3 weeks. Most recently, OBD2 Scanner | OBD Auto Doctor was updated on November 1, 2026 and ThinkDiag+ on October 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*