# Sound Level & Spectrogram vs Zephyr Control

The clearest difference is ads: Zephyr Control at none against Sound Level & Spectrogram's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sound Level & Spectrogram ships an update every 5 months, Zephyr Control every 6 months. The most recent releases landed on October 6, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Sound Level & Spectrogram | Zephyr Control |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 6 months |
| Monetization | Ad-supported | — |
| Size | 4 MB | 40 MB |
| Requires iOS | 18.7 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [TOON,LLC](https://appshunter.io/developer/633948723) | [Tecniplast SpA](https://appshunter.io/developer/1767768361) |

## What reviewers say

### Sound Level & Spectrogram

[App page](https://appshunter.io/ios/app/sound-level-and-spectrogram/id6503722682)

Measure sound levels in decibels and visualize sound frequencies with a real-time spectrogram. Understand your environment's noise and protect your health. Offers advanced settings for accurate acoustic analysis.

**Highlights:** Sound level measurement (dB), Real-time spectrogram analysis, Frequency weighting correction (A, C, Z), Time weighting characteristics (Fast, Slow), Time course graph, Environmental noise measurement

**In-app purchases:** none


### Zephyr Control

[App page](https://appshunter.io/ios/app/zephyr-control/id6673896255)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sound Level & Spectrogram free?

Sound Level & Spectrogram is free to download, with no in-app purchases.

### Is Zephyr Control free?

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

### Do Sound Level & Spectrogram or Zephyr Control have ads?

Sound Level & Spectrogram shows ads; Zephyr Control does not.

### Which is updated more often, Sound Level & Spectrogram or Zephyr Control?

Sound Level & Spectrogram ships an update every 5 months, and Zephyr Control every 6 months. Most recently, Sound Level & Spectrogram was updated on October 6, 2026 and Zephyr Control on October 1, 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.*