# Attenuator vs 奇门遁甲术

The clearest difference is in-app purchases: 奇门遁甲术 at none against Attenuator's 1. 奇门遁甲术 also leads on update cadence (every 4 days vs every 7 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Attenuator sells 1 one-off in-app purchase. 奇门遁甲术 asks for nothing beyond the download.

Attenuator ships an update every 7 months, 奇门遁甲术 every 4 days. The most recent releases landed on July 29, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Attenuator | 奇门遁甲术 |
| --- | --- | --- |
| Price | Free | Free |
| 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 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 153 MB |
| Requires iOS | 17.6 | **12.2** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Tim E. Burrow](https://appshunter.io/developer/367216557) | [CHEUNG PUI MAN](https://appshunter.io/developer/291179028) |

## 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 |


### 奇门遁甲术

[App page](https://appshunter.io/ios/app/id642373753)

**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 奇门遁甲术 free?

奇门遁甲术 is free to download, with no in-app purchases.

### Do Attenuator or 奇门遁甲术 have ads?

Neither Attenuator nor 奇门遁甲术 shows ads.

### Which is updated more often, Attenuator or 奇门遁甲术?

Attenuator ships an update every 7 months, and 奇门遁甲术 every 4 days. Most recently, Attenuator was updated on July 29, 2026 and 奇门遁甲术 on September 18, 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.*