# Attenuator vs RadMonJP

The clearest difference is update cadence: RadMonJP at every 4 days against Attenuator's every 7 months. Attenuator's advantage is iOS requirement (17.6 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Attenuator sells 1 one-off in-app purchase and RadMonJP sells 6 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Attenuator ships an update every 7 months, RadMonJP every 4 days. The most recent releases landed on July 29, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Attenuator | RadMonJP |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 9 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Tim E. Burrow](https://appshunter.io/developer/367216557) | [RR Aware Studio](https://appshunter.io/developer/1439301679) |

## 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 |


### RadMonJP

[App page](https://appshunter.io/ios/app/radmonjp/id6737837347)

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム1ヶ月 | $0.99 | per month |
| Bronze | $4.99 | per year |
| Silver sponsor | $9.99 | per year |
| Gold sponsor | $19.99 | per year |
| Platinum sponsor | $49.99 | per year |
| Diamond sponsor | $99.99 | per year |


## Frequently asked questions

### Is Attenuator free?

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

### Is RadMonJP free?

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

### Do Attenuator or RadMonJP have ads?

Neither Attenuator nor RadMonJP shows ads.

### Which is updated more often, Attenuator or RadMonJP?

Attenuator ships an update every 7 months, and RadMonJP every 4 days. Most recently, Attenuator was updated on July 29, 2026 and RadMonJP on September 15, 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.*