# ThinkDiag+ vs BM500

The clearest difference is review sentiment: ThinkDiag+ at 74% against BM500's 0%. ThinkDiag+ also leads on rating (4.5 vs 3.0) and ratings volume (4.3K vs 2). BM500's advantage is monetization model (free vs free with in-app purchases). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ThinkDiag+ holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: ThinkDiag+ has 4.3K ratings behind it against 2, 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 0% of BM500's.

ThinkDiag+ ships an update every 3 weeks, BM500 fortnightly. The most recent releases landed on October 12, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | ThinkDiag+ | BM500 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (4.3K ratings)](https://appshunter.io/ios/app/thinkdiag-plus/id1483420979/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/bm500/id1557463189/reviews) |
| Number of ratings | **4.3K** | 2 |
| Positive reviews | **73.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 539 MB | 8 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [THINKCAR INC](https://appshunter.io/developer/1464847379) | [亮 侯](https://appshunter.io/developer/616725498) |

## What reviewers say

### 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


### BM500

[App page](https://appshunter.io/ios/app/bm500/id1557463189)

This application connects to Bluetooth battery testers to perform comprehensive battery health checks. Users can easily test battery condition, cranking, and charging systems, with the ability to save and share professional results.

**Highlights:** Bluetooth connectivity to battery testers, Battery condition testing, Cranking system testing, Charging system testing, Save test data, Share professional results

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ThinkDiag+ free?

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

### Is BM500 free?

BM500 is free to download, with no in-app purchases.

### Which has better reviews, ThinkDiag+ or BM500?

ThinkDiag+ is rated higher. ThinkDiag+ averages 4.5 out of 5 from 4.3K ratings, while BM500 averages 3.0 from 2 ratings.

### Do ThinkDiag+ or BM500 have ads?

Neither ThinkDiag+ nor BM500 shows ads.

### Which is updated more often, ThinkDiag+ or BM500?

ThinkDiag+ ships an update every 3 weeks, and BM500 fortnightly. Most recently, ThinkDiag+ was updated on October 12, 2026 and BM500 on September 16, 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.*