# Audio SA vs Sound Level & Spectrogram

The clearest difference is in-app purchases: Sound Level & Spectrogram at none against Audio SA's 1. Audio SA's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.7). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Audio SA sells 1 one-off in-app purchase. Sound Level & Spectrogram asks for nothing beyond the download.

Audio SA ships an update every 6 months, Sound Level & Spectrogram every 5 months. The most recent releases landed on August 31, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Audio SA | Sound Level & Spectrogram |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 6 months | **Every 5 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 5 MB | 4 MB |
| Requires iOS | **15.6** | 18.7 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### Audio SA

[App page](https://appshunter.io/ios/app/audio-sa/id6444715596)

This app analyzes audio waveforms to create visual voiceprints as TFFT images. It offers extensive customization for FFT analysis, including adjustable ranges, sizes, scales, and window functions. A simple waveform generator is also included for learning purposes.

**Highlights:** TFFT voiceprint image generation, High-resolution image export, Customizable FFT analysis settings, Adjustable audio waveform analysis range, Simple waveform generator (sine, square, noise), Multiple FFT sizes and window functions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads. | $3.99 | 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 Audio SA free?

Audio SA 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 Audio SA or Sound Level & Spectrogram have ads?

Both Audio SA and Sound Level & Spectrogram show ads.

### Which is updated more often, Audio SA or Sound Level & Spectrogram?

Audio SA ships an update every 6 months, and Sound Level & Spectrogram every 5 months. Most recently, Audio SA was updated on August 31, 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.*