# SimpleFFT vs Audio SA

The clearest difference is update cadence: Audio SA at every 6 months against SimpleFFT's every 18 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SimpleFFT sells 1 one-off in-app purchase and Audio SA sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SimpleFFT ships an update every 18 months, Audio SA every 6 months. The most recent releases landed on September 28, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | SimpleFFT | Audio SA |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 18 months | **Every 6 months** |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 5 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HIROFUMI MARUO](https://appshunter.io/developer/667820705) | [Yasuyoshi Ota](https://appshunter.io/developer/1500357652) |

## What reviewers say

### SimpleFFT

[App page](https://appshunter.io/ios/app/simplefft/id1239257017)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Functions | $0.49 | one-time |


### 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 |


## Frequently asked questions

### Is SimpleFFT free?

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

### Is Audio SA free?

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

### Do SimpleFFT or Audio SA have ads?

Both SimpleFFT and Audio SA show ads.

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

SimpleFFT ships an update every 18 months, and Audio SA every 6 months. Most recently, SimpleFFT was updated on September 28, 2026 and Audio SA on August 31, 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.*