# Mesmerising Clock vs Noise Level Meter

The clearest difference is in-app purchases: Mesmerising Clock at none against Noise Level Meter's 3. Mesmerising Clock also leads on iOS requirement (13.0 vs 18.0). Noise Level Meter's advantage is update cadence (weekly vs every 70 months). On price, ads and device support there is nothing between them.

Both are free to download. Noise Level Meter sells 3 in-app purchases, starting at $3.99 per 7 days. Mesmerising Clock asks for nothing beyond the download.

Mesmerising Clock ships an update every 70 months, Noise Level Meter weekly. The most recent releases landed on November 7, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Mesmerising Clock | Noise Level Meter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (4 ratings)](https://appshunter.io/ios/app/noise-level-meter-spectroid/id6798899899/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 70 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 18 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Emily Smithson](https://appshunter.io/developer/1459763926) | [Kostiantyn Liubevych](https://appshunter.io/developer/1734302743) |

## What reviewers say

### Mesmerising Clock

[App page](https://appshunter.io/ios/app/mesmerising-clock/id1532195544)

**Features:** macOS Compatibility

**In-app purchases:** none


### Noise Level Meter

[App page](https://appshunter.io/ios/app/noise-level-meter-spectroid/id6798899899)

This app transforms your iPhone into a sophisticated sound level meter and frequency analyzer. It offers instant decibel readings, detailed spectrum analysis, and the ability to save and export measurement sessions. Designed for various everyday uses, it provides clear and beautiful sound measurement.

**Highlights:** Live decibel meter, FFT spectrum analyzer, Octave-band visualization, Record measurement sessions, Export PDF reports, Calibration offset

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $3.99 | per 7 days |
| Annual Plan | $29.99 | per year |
| Spectroid Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Mesmerising Clock free?

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

### Is Noise Level Meter free?

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

### Do Mesmerising Clock or Noise Level Meter have ads?

Neither Mesmerising Clock nor Noise Level Meter shows ads.

### Which is updated more often, Mesmerising Clock or Noise Level Meter?

Mesmerising Clock ships an update every 70 months, and Noise Level Meter weekly. Most recently, Mesmerising Clock was updated on November 7, 2026 and Noise Level Meter on November 10, 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.*