# MZ Assistant vs Decibel

The clearest difference is price: Decibel at Free against MZ Assistant's $1.99. Decibel also leads on iOS requirement (13.1 vs 15.0). MZ Assistant's advantage is in-app purchases (none vs 10) and update cadence (every 10 days vs monthly). On ads and device support there is nothing between them.

Decibel is free to download; MZ Assistant costs $1.99 up front. Decibel sells 10 in-app purchases, starting at $1.99 per 7 days. MZ Assistant asks for nothing beyond the download.

MZ Assistant ships an update every 10 days, Decibel monthly. The most recent releases landed on October 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | MZ Assistant | Decibel |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.4 (322 ratings)](https://appshunter.io/ios/app/decibel-db-noise-level-meter/id6464403884/reviews)** |
| Number of ratings | — | **322** |
| Positive reviews | — | 81.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 80 MB |
| Requires iOS | 15.0 | **13.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Ivan Svicarevic](https://appshunter.io/developer/1689517785) | [EYWIN BILGI TEKNOLOJILERI ANONIM SIRKETI](https://appshunter.io/developer/1492105189) |

## What reviewers say

### MZ Assistant

[App page](https://appshunter.io/ios/app/mz-assistant/id6449512242)

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

**In-app purchases:** none


### Decibel

[App page](https://appshunter.io/ios/app/decibel-db-noise-level-meter/id6464403884)

Measure, analyze, and protect your hearing with this comprehensive sound level meter. It offers real-time decibel readings, noise exposure monitoring, and tools for audio exploration like frequency generation and speaker cleaning.

**Highlights:** Real-time sound level measurement (dB), Noise exposure monitoring (Dosimeter), Interactive recording and visualization, Frequency generator, Speaker cleaner, Frequency hearing test

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grooz DB Meter Weekly | $1.99 | per 7 days |
| Weekly Decibel Meter | $2.99 | per 7 days |
| weekly premium | $3.99 | per 7 days |
| Weekly PRO Decibel | $4.99 | per 7 days |
| Monthly Premium | $6.99 | per month |
| Unlimited Weekly PRO | $7.99 | per 7 days |
| Monthly Decibel Sonic PRO | $12.99 | per month |
| Annual Decibel Meter | $29.99 | per year |
| Yearly Premium | $39.99 | per year |
| Yearly Decibel Sonic PRO | $44.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 📏 Accurate decibel meter
- 🔊 High sound level detection
- 👂 Healthy for ear
- 🏠 Useful for home noise levels

**What reviewers complain about**

- 🔋 High battery usage
- 💸 Difficult to cancel subscription
- 💳 Hidden charges after trial
- ⚠️ Dodgy subscription practices

**Reported bugs**

- Background activity drains battery
- Subscription cancellation not obvious

**Requested features**

- Clear cancellation instructions


## Frequently asked questions

### Is MZ Assistant free?

MZ Assistant costs $1.99, with no in-app purchases.

### Is Decibel free?

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

### Do MZ Assistant or Decibel have ads?

Neither MZ Assistant nor Decibel shows ads.

### Which is updated more often, MZ Assistant or Decibel?

MZ Assistant ships an update every 10 days, and Decibel monthly. Most recently, MZ Assistant was updated on October 8, 2026 and Decibel on November 9, 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.*