# SmarterNoise Pro vs Sound Level & Spectrogram

The clearest difference is review sentiment: Sound Level & Spectrogram at 100% against SmarterNoise Pro's 29%. Sound Level & Spectrogram also leads on in-app purchases (none vs 4). SmarterNoise Pro's advantage is ads (none vs shown) and update cadence (monthly vs every 5 months). On price and device support there is nothing between them.

Both are free to download. SmarterNoise Pro sells 4 one-off in-app purchases. Sound Level & Spectrogram asks for nothing beyond the download.

SmarterNoise Pro ships an update monthly, Sound Level & Spectrogram every 5 months. The most recent releases landed on September 7, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SmarterNoise Pro | Sound Level & Spectrogram |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (31 ratings)](https://appshunter.io/ios/app/smarternoise-pro/id1466745030/reviews)** | — |
| Number of ratings | **31** | — |
| Positive reviews | 28.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 5 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 24 MB | 4 MB |
| Requires iOS | **12.0** | 18.7 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Johan Rogard](https://appshunter.io/developer/1384299041) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### SmarterNoise Pro

[App page](https://appshunter.io/ios/app/smarternoise-pro/id1466745030)

This advanced sound level meter app offers detailed audio analysis with features like frequency spectrum display and data export. It allows for precise sound measurements in both video and audio recording modes, with options for A-, C-, or no weighting.

**Highlights:** Sound level measurement in video/audio modes, Frequency spectrum display, Export measurement data (CSV), Sound level activated audio recording, Calibration tool, Full HD video recording (paid)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Camera upgrade | $0.99 | one-time |
| Frequency spectrum indicator | $1.99 | one-time |
| Video and audio recording | $1.99 | one-time |
| Spectrogram display | $1.99 | one-time |


### 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


## Frequently asked questions

### Is SmarterNoise Pro free?

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

### Is Sound Level & Spectrogram free?

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

### Do SmarterNoise Pro or Sound Level & Spectrogram have ads?

Sound Level & Spectrogram shows ads; SmarterNoise Pro does not.

### Which is updated more often, SmarterNoise Pro or Sound Level & Spectrogram?

SmarterNoise Pro ships an update monthly, and Sound Level & Spectrogram every 5 months. Most recently, SmarterNoise Pro was updated on September 7, 2026 and Sound Level & Spectrogram on September 18, 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.*