# Audio SA vs FormantScope

The clearest difference is in-app purchases: FormantScope at none against Audio SA's 1. FormantScope also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 6 months). Audio SA's advantage is iOS requirement (15.6 vs 17.0). On price and device support there is nothing between them.

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

Audio SA ships an update every 6 months, FormantScope every 6 weeks. Both last shipped on October 3, 2026.

## The numbers

| Metric | Audio SA | FormantScope |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 4 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) | [跃然 王](https://appshunter.io/developer/1895682344) |

## 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 |


### FormantScope

[App page](https://appshunter.io/ios/app/formantscope/id6764803567)

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

**In-app purchases:** none


## Frequently asked questions

### Is Audio SA free?

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

### Is FormantScope free?

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

### Do Audio SA or FormantScope have ads?

Audio SA shows ads; FormantScope does not.

### Which is updated more often, Audio SA or FormantScope?

Audio SA ships an update every 6 months, and FormantScope every 6 weeks. Most recently, Audio SA was updated on October 3, 2026 and FormantScope on October 3, 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.*