# iSmartDiag vs Troodon OBD

The clearest difference is update cadence: iSmartDiag at every 4 days against Troodon OBD's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

iSmartDiag ships an update every 4 days, Troodon OBD every 3 weeks. Both last shipped on November 12, 2026.

## The numbers

| Metric | iSmartDiag | Troodon OBD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/ismartdiag/id1669179670/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 615 MB | 27 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Shenzhen Vident Technology Co., Ltd](https://appshunter.io/developer/1661505875) | [DevCom spol. s.r.o.](https://appshunter.io/developer/1725153456) |

## 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


### Troodon OBD

[App page](https://appshunter.io/ios/app/troodon-obd/id6475777811)

**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 Troodon OBD free?

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

### Do iSmartDiag or Troodon OBD have ads?

Neither iSmartDiag nor Troodon OBD shows ads.

### Which is updated more often, iSmartDiag or Troodon OBD?

iSmartDiag ships an update every 4 days, and Troodon OBD every 3 weeks. Most recently, iSmartDiag was updated on November 12, 2026 and Troodon OBD on November 12, 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.*