# SmartZDOBD vs NOX TESTER

The clearest difference is iOS requirement: SmartZDOBD at 12.0 against NOX TESTER's 15.6. 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.

SmartZDOBD ships an update every 2 weeks, NOX TESTER every 3 weeks. The most recent releases landed on October 6, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | SmartZDOBD | NOX TESTER |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nox-tester/id6758373750/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | — | Free |
| Size | 38 MB | 5 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳市正德友邦科技有限公司](https://appshunter.io/developer/1691030696) | [Proformance Diagnostics LLC](https://appshunter.io/developer/1852904316) |

## What reviewers say

### SmartZDOBD

[App page](https://appshunter.io/ios/app/smartzdobd/id6746559817)

**Features:** macOS Compatibility

**In-app purchases:** none


### NOX TESTER

[App page](https://appshunter.io/ios/app/nox-tester/id6758373750)

This diagnostic tool tests NOx sensors by connecting to the sensor's circuit board and probe. It activates the sensor, collects data on NOx and oxygen levels for three minutes, and analyzes the results to identify faults and generate a report.

**Highlights:** Connects to NOx sensor via diagnostic harness, Communicates via CAN signals, Tests sensor circuit board and detection probe, Activates NOx sensor, Collects NOx and oxygen concentration data, Analyzes data and generates test reports

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

**In-app purchases:** none


## Frequently asked questions

### Is SmartZDOBD free?

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

### Is NOX TESTER free?

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

### Do SmartZDOBD or NOX TESTER have ads?

Neither SmartZDOBD nor NOX TESTER shows ads.

### Which is updated more often, SmartZDOBD or NOX TESTER?

SmartZDOBD ships an update every 2 weeks, and NOX TESTER every 3 weeks. Most recently, SmartZDOBD was updated on October 6, 2026 and NOX TESTER on October 19, 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.*