# NOX TESTER vs Nox Light

The clearest difference is ads: NOX TESTER at none against Nox Light's shown. Nox Light's advantage is update cadence (every 4 days vs every 3 weeks) and iOS requirement (13.0 vs 15.6). On price, 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.

NOX TESTER ships an update every 3 weeks, Nox Light every 4 days. The most recent releases landed on June 5, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | NOX TESTER | Nox Light |
| --- | --- | --- |
| 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** | Yes |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | Free | — |
| Size | 5 MB | 33 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Proformance Diagnostics LLC](https://appshunter.io/developer/1852904316) | [Jaewon Jung](https://appshunter.io/developer/1509475657) |

## What reviewers say

### 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


### Nox Light

[App page](https://appshunter.io/ios/app/nox-light-flashlight/id6773748002)

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

**In-app purchases:** none


## Frequently asked questions

### Is NOX TESTER free?

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

### Is Nox Light free?

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

### Do NOX TESTER or Nox Light have ads?

Nox Light shows ads; NOX TESTER does not.

### Which is updated more often, NOX TESTER or Nox Light?

NOX TESTER ships an update every 3 weeks, and Nox Light every 4 days. Most recently, NOX TESTER was updated on June 5, 2026 and Nox Light on September 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.*