# iSmartDiag vs AutoOBDII

The clearest difference is rating: AutoOBDII at 5.0 against iSmartDiag's 1.0. AutoOBDII also leads on iOS requirement (13 vs 15.5). iSmartDiag's advantage is update cadence (every 4 days vs every 4 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.

AutoOBDII holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

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

## The numbers

| Metric | iSmartDiag | AutoOBDII |
| --- | --- | --- |
| 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/autoobdii/id6503489503/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 months |
| Monetization | Free | Free |
| Size | 615 MB | 83 MB |
| Requires iOS | 15.5 | **13** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 9+ | 17+ |
| Developer | [Shenzhen Vident Technology Co., Ltd](https://appshunter.io/developer/1661505875) | [Shenzhen Lonauto Technology Co., Ltd.](https://appshunter.io/developer/1744849406) |

## 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


### AutoOBDII

[App page](https://appshunter.io/ios/app/autoobdii/id6503489503)

This application connects to your vehicle via Bluetooth to perform diagnostics and offer driving assistance. It can read and clear fault codes, analyze performance, and track your journeys. Supports multiple languages and high-speed data transmission.

**Highlights:** Bluetooth vehicle communication, Fault code reading and clearing, Instrument panel monitoring, Performance testing, Travel analysis, High-speed data transmission, Low power consumption

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

**In-app purchases:** none


## Frequently asked questions

### Is iSmartDiag free?

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

### Is AutoOBDII free?

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

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

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

### Do iSmartDiag or AutoOBDII have ads?

Neither iSmartDiag nor AutoOBDII shows ads.

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

iSmartDiag ships an update every 4 days, and AutoOBDII every 4 months. Most recently, iSmartDiag was updated on November 7, 2026 and AutoOBDII 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.*