# iSmartDiag vs ELMCheck

The clearest difference is review sentiment: ELMCheck at 100% against iSmartDiag's 25%. ELMCheck also leads on rating (5.0 vs 1.0). iSmartDiag's advantage is in-app purchases (none vs 1) and update cadence (every 4 days vs every 2 weeks). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. ELMCheck sells 1 one-off in-app purchase. iSmartDiag asks for nothing beyond the download.

ELMCheck holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 25% of iSmartDiag's written reviews are positive against 100% of ELMCheck's.

iSmartDiag ships an update every 4 days, ELMCheck every 2 weeks. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | iSmartDiag | ELMCheck |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/ismartdiag/id1669179670/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/elmcheck/id6479630442/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 615 MB | 14 MB |
| Requires iOS | **15.5** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 9+ | 4+ |
| Developer | [Shenzhen Vident Technology Co., Ltd](https://appshunter.io/developer/1661505875) | [Fearless design, LLC](https://appshunter.io/developer/321056993) |

## 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 and diagnose over 110 vehicle brands, offering detailed reports and maintenance functions to save time and costs.

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

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

**In-app purchases:** none


### ELMCheck

[App page](https://appshunter.io/ios/app/elmcheck/id6479630442)

Verify the authenticity and functionality of your OBD-II scanner. This app runs comprehensive tests on ELM327 commands to report supported features, ensuring safe and reliable use with your vehicle.

**Highlights:** Authenticity testing for OBD-II scanners, Comprehensive ELM327 command test suite, Reports actual supported features, Ensures safe scanner usage, Basic tests are free, Unlock full suite with in-app purchase

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Comprehensive testing | $2.99 | one-time |


## Frequently asked questions

### Is iSmartDiag free?

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

### Is ELMCheck free?

ELMCheck is free to download, with in-app purchases available.

### Which has better reviews, iSmartDiag or ELMCheck?

ELMCheck is rated higher. iSmartDiag averages 1.0 out of 5 from 2 ratings, while ELMCheck averages 5.0 from 1 ratings.

### Do iSmartDiag or ELMCheck have ads?

Neither iSmartDiag nor ELMCheck shows ads.

### Which is updated more often, iSmartDiag or ELMCheck?

iSmartDiag ships an update every 4 days, and ELMCheck every 2 weeks. Most recently, iSmartDiag was updated on November 7, 2026 and ELMCheck on November 4, 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.*