# STEELMAN vs NRG Optimizer

The clearest difference is iOS requirement: STEELMAN at 9.0 against NRG Optimizer's 12.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

STEELMAN ships an update every 22 months, NRG Optimizer every 13 months. The most recent releases landed on October 12, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | STEELMAN | NRG Optimizer |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 13 months** |
| Monetization | Free | — |
| Size | 19 MB | 154 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [JS Products, Inc.](https://appshunter.io/developer/673417159) | [T.G.L. Inc.](https://appshunter.io/developer/1629823848) |

## 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


### NRG Optimizer

[App page](https://appshunter.io/ios/app/nrg-optimizer/id1629823846)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is STEELMAN free?

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

### Is NRG Optimizer free?

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

### Do STEELMAN or NRG Optimizer have ads?

Neither STEELMAN nor NRG Optimizer shows ads.

### Which is updated more often, STEELMAN or NRG Optimizer?

STEELMAN ships an update every 22 months, and NRG Optimizer every 13 months. Most recently, STEELMAN was updated on October 12, 2026 and NRG Optimizer on September 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*