# iSmartDiag vs ThinkCar Bay

The clearest difference is rating: ThinkCar Bay at 3.8 against iSmartDiag's 1.0. ThinkCar Bay also leads on review sentiment (50% vs 25%) and iOS requirement (9.0 vs 15.5). iSmartDiag's advantage is update cadence (every 4 days vs every 5 months). On price, ratings volume, 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.

ThinkCar Bay holds the better App Store score, 3.8 against 1.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 25% of iSmartDiag's written reviews are positive against 50% of ThinkCar Bay's.

iSmartDiag ships an update every 4 days, ThinkCar Bay every 5 months. The most recent releases landed on October 27, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | iSmartDiag | ThinkCar Bay |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/ismartdiag/id1669179670/reviews) | **[3.8 (4 ratings)](https://appshunter.io/ios/app/thinkcar-bay/id6444782891/reviews)** |
| Number of ratings | 2 | **4** |
| Positive reviews | 25.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 months |
| Monetization | Free | Free |
| Size | 614 MB | 215 MB |
| Requires iOS | 15.5 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 17+ |
| Developer | [Shenzhen Vident Technology Co., Ltd](https://appshunter.io/developer/1661505875) | [THINKCAR INC](https://appshunter.io/developer/1464847379) |

## What reviewers say

### iSmartDiag

[App page](https://appshunter.io/ios/app/ismartdiag/id1669179670)

This app provides powerful automotive diagnostic functions for mechanics, drivers, and DIYers. It connects via Bluetooth to scan over 110 vehicle brands, read/erase fault codes, and perform active tests. Save time and costs with detailed reports and maintenance functions.

**Highlights:** 110+ vehicle brands coverage, Full system scan & diagnosis, Bi-directional control, Read/erase fault codes, Maintenance functions, Data stream graph display, Bluetooth connectivity

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ThinkCar Bay

[App page](https://appshunter.io/ios/app/thinkcar-bay/id6444782891)

This service application supports THINKCAR automotive diagnostic products. It offers tutorials, case studies, after-sales service, and online viewing of diagnostic reports. Manage your products and get assistance with their use.

**Highlights:** Product tutorials, Case studies, After-sales service, User product management, Online diagnostic report viewing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iSmartDiag free?

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

### Is ThinkCar Bay free?

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

### Which has better reviews, iSmartDiag or ThinkCar Bay?

ThinkCar Bay is rated higher. iSmartDiag averages 1.0 out of 5 from 2 ratings, while ThinkCar Bay averages 3.8 from 4 ratings.

### Do iSmartDiag or ThinkCar Bay have ads?

Neither iSmartDiag nor ThinkCar Bay shows ads.

### Which is updated more often, iSmartDiag or ThinkCar Bay?

iSmartDiag ships an update every 4 days, and ThinkCar Bay every 5 months. Most recently, iSmartDiag was updated on October 27, 2026 and ThinkCar Bay on October 21, 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.*