# N9 vs OCCDEC Occasion Detection

The clearest difference is iOS requirement: N9 at 8.0 against OCCDEC Occasion Detection's 15.1. 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.

N9 ships an update every 3 weeks, OCCDEC Occasion Detection every 2 weeks. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | N9 | OCCDEC Occasion Detection |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (3 ratings)](https://appshunter.io/ios/app/n9/id1337449449/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 83 MB | 32 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [传林 方](https://appshunter.io/developer/699727053) | [LineSpotting AB](https://appshunter.io/developer/1326519237) |

## What reviewers say

### N9

[App page](https://appshunter.io/ios/app/n9/id1337449449)

This utility app alerts you to vehicle presence using infrared detectors. Customize alarm volume and choose from 16 distinct sounds. It supports up to 12 infrared sensors across six zones.

**Highlights:** Infrared vehicle detection, Adjustable alarm volume, 16 alarm sound options, Supports 12 infrared sensors, Six detection zones

**Features:** macOS Compatibility

**In-app purchases:** none


### OCCDEC Occasion Detection

[App page](https://appshunter.io/ios/app/occdec-occasion-detection/id1495592504)

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

**In-app purchases:** none


## Frequently asked questions

### Is N9 free?

N9 is free to download, with no in-app purchases.

### Is OCCDEC Occasion Detection free?

OCCDEC Occasion Detection is free to download, with no in-app purchases.

### Do N9 or OCCDEC Occasion Detection have ads?

Neither N9 nor OCCDEC Occasion Detection shows ads.

### Which is updated more often, N9 or OCCDEC Occasion Detection?

N9 ships an update every 3 weeks, and OCCDEC Occasion Detection every 2 weeks. Most recently, N9 was updated on October 16, 2026 and OCCDEC Occasion Detection on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*