# OCCDEC Occasion Detection vs NoiseLog

The clearest difference is ads: OCCDEC Occasion Detection at none against NoiseLog's shown. OCCDEC Occasion Detection also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, update cadence 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.

OCCDEC Occasion Detection ships an update every 2 weeks, NoiseLog every 3 weeks. The most recent releases landed on October 25, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | OCCDEC Occasion Detection | NoiseLog |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 32 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [LineSpotting AB](https://appshunter.io/developer/1326519237) | [Kai Hoeher](https://appshunter.io/developer/693968628) |

## What reviewers say

### OCCDEC Occasion Detection

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

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

**In-app purchases:** none


### NoiseLog

[App page](https://appshunter.io/ios/app/noiselog-decibel-meter/id6766041381)

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

**In-app purchases:** none


## Frequently asked questions

### Is OCCDEC Occasion Detection free?

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

### Is NoiseLog free?

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

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

NoiseLog shows ads; OCCDEC Occasion Detection does not.

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

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