# Decibel Meter vs Sigma Timer

The clearest difference is in-app purchases: Sigma Timer at none against Decibel Meter's 4. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Decibel Meter sells 4 in-app purchases, starting at $3.99 per 7 days. Sigma Timer asks for nothing beyond the download.

## The numbers

| Metric | Decibel Meter | Sigma Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (54 ratings)](https://appshunter.io/ios/app/decibel-meter-sound-analyzer/id1579747105/reviews)** | — |
| Number of ratings | **54** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | — |
| Monetization | Freemium | — |
| Size | 18 MB | 20 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Rychard Matskevich](https://appshunter.io/developer/1395390712) | [Sigma Laborzentrifugen GmbH](https://appshunter.io/developer/1731355921) |

## What reviewers say

### Decibel Meter

[App page](https://appshunter.io/ios/app/decibel-meter-sound-analyzer/id1579747105)

This tool transforms your iPhone into a professional sound level meter, measuring decibels and analyzing sound frequencies. It helps identify harmful noise levels to protect your hearing and health, offering detailed insights and measurement history.

**Highlights:** Professional sound level meter, Sound frequency analysis, Noise dosimeter with standards, Accurate sound pressure measurements, Save and export measurements, Advanced measurement charts, MIN/MAX/AVG data

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Decibel Meter Premium Weekly | $3.99 | per 7 days |
| Noise Spectrum Detector VIP | $8.99 | per month |
| Noise Frequency Checker VIP | $19.99 | per 3 months |
| Sound Level Analyzer dB VIP | $29.99 | per year |


### Sigma Timer

[App page](https://appshunter.io/ios/app/sigma-timer/id6478013776)

**In-app purchases:** none


## Frequently asked questions

### Is Decibel Meter free?

Decibel Meter is free to download, with in-app purchases available.

### Is Sigma Timer free?

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

### Do Decibel Meter or Sigma Timer have ads?

Neither Decibel Meter nor Sigma Timer shows ads.

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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.*