# Attenuator vs Motor Power Calculator

The clearest difference is price: Attenuator at Free against Motor Power Calculator's $0.99. Attenuator also leads on update cadence (every 7 months vs every 45 months). Motor Power Calculator's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

Attenuator is free to download; Motor Power Calculator costs $0.99 up front. Attenuator sells 1 one-off in-app purchase. Motor Power Calculator asks for nothing beyond the download.

Attenuator ships an update every 7 months, Motor Power Calculator every 45 months. The most recent releases landed on July 29, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Attenuator | Motor Power Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/attenuator/id367216554/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 45 months |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 0 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tim E. Burrow](https://appshunter.io/developer/367216557) | [Kei Suefuji](https://appshunter.io/developer/1388335881) |

## What reviewers say

### Attenuator

[App page](https://appshunter.io/ios/app/attenuator/id367216554)

Calculate output voltage, power, and attenuation based on input values and dB of attenuation. Features NMR-specific calculations for pulses and measures local magnetic fields and barometric pressure.

**Highlights:** Calculate output voltage and power, Specify input voltage (Vpp or Vrms), Calculate attenuation in dB, NMR pulse calculations, Measure local magnetic field, Display barometric pressure

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove all ads | $1.99 | one-time |


### Motor Power Calculator

[App page](https://appshunter.io/ios/app/motor-power-calculator/id1429280610)

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

**In-app purchases:** none


## Frequently asked questions

### Is Attenuator free?

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

### Is Motor Power Calculator free?

Motor Power Calculator costs $0.99, with no in-app purchases.

### Do Attenuator or Motor Power Calculator have ads?

Neither Attenuator nor Motor Power Calculator shows ads.

### Which is updated more often, Attenuator or Motor Power Calculator?

Attenuator ships an update every 7 months, and Motor Power Calculator every 45 months. Most recently, Attenuator was updated on July 29, 2026 and Motor Power Calculator on September 9, 2026.

---

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