# SimpleFFT vs App4SHM

The clearest difference is in-app purchases: App4SHM at none against SimpleFFT's 1. App4SHM also leads on ads (none vs shown) and update cadence (every 4 months vs every 18 months). On price and device support there is nothing between them.

Both are free to download. SimpleFFT sells 1 one-off in-app purchase. App4SHM asks for nothing beyond the download.

SimpleFFT ships an update every 18 months, App4SHM every 4 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | SimpleFFT | App4SHM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 18 months | **Every 4 months** |
| Size | 5 MB | 27 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HIROFUMI MARUO](https://appshunter.io/developer/667820705) | [COFAC](https://appshunter.io/developer/962813435) |

## 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 |


### App4SHM

[App page](https://appshunter.io/ios/app/app4shm/id6453887192)

**In-app purchases:** none


## Frequently asked questions

### Is SimpleFFT free?

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

### Is App4SHM free?

App4SHM is free to download, with no in-app purchases.

### Do SimpleFFT or App4SHM have ads?

SimpleFFT shows ads; App4SHM does not.

### Which is updated more often, SimpleFFT or App4SHM?

SimpleFFT ships an update every 18 months, and App4SHM every 4 months. Most recently, SimpleFFT was updated on November 6, 2026 and App4SHM on November 7, 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.*