# STEELMAN vs SimpleFFT

The clearest difference is in-app purchases: STEELMAN at none against SimpleFFT's 1. STEELMAN also leads on ads (none vs shown) and iOS requirement (9.0 vs 15.0). On price, update cadence and device support there is nothing between them.

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

STEELMAN ships an update every 22 months, SimpleFFT every 18 months. The most recent releases landed on September 26, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | STEELMAN | SimpleFFT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/steelman-smartear1/id673421095/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 22 months | **Every 18 months** |
| Monetization | Free | — |
| Size | 19 MB | 5 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JS Products, Inc.](https://appshunter.io/developer/673417159) | [HIROFUMI MARUO](https://appshunter.io/developer/667820705) |

## What reviewers say

### STEELMAN

[App page](https://appshunter.io/ios/app/steelman-smartear1/id673421095)

This app transforms your iOS device into a sound and vibration detection tool. It helps pinpoint defective or worn parts in vehicles and machinery by analyzing rattles, squeaks, and grinding sounds. Requires additional hardware for full functionality.

**Highlights:** Sound and vibration detection, Pinpoints defective parts, User-friendly interface, Analog and digital readings, Selectable audio/vibration input, 10-band frequency equalizer

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is STEELMAN free?

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

### Is SimpleFFT free?

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

### Do STEELMAN or SimpleFFT have ads?

SimpleFFT shows ads; STEELMAN does not.

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

STEELMAN ships an update every 22 months, and SimpleFFT every 18 months. Most recently, STEELMAN was updated on September 26, 2026 and SimpleFFT on October 10, 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.*