Attenuator vs RadMonJP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Attenuator
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.
- 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
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Attenuator is a utility for anyone working with radio frequency sources and needs to know power and voltage after attenuation. You can specify an input voltage (Vpp or Vrms) and dB of attenuation to get the output voltage, power and attenuation. The impedance can be specified, typically 50Ω for most systems. There is a new emphasis on NMR utility, with options for calculating pulses based on reference power and pulse length. Powers are in Watts, dBm, and dB values. Measure local magnetic field to check stray static fields from magnets. See the local barometric pressure, useful if the magnet boil-off is high
RadMonJP
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RadMonJP is a radiation monitoring app that helps you check radiation levels across Japan in real time. Key features: - Browse monitoring posts nationwide in a clear dashboard - View radiation levels on an interactive map - Check rankings to quickly identify higher readings - See each monitoring post's current reading, weather, and 24-hour trend - Customize daily reports and emergency alerts Whether you are checking conditions near home or planning a trip, RadMonJP helps you find the information you need quickly for greater peace of mind for you and your family. This app is supported by advertising. Join the annual sponsorship program to remove ads and support future development. Privacy Policy: https://radmon.jp/privacy Terms of Use: https://radmon.jp/terms
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Attenuator | RadMonJP |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 7 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 1 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Tim E. Burrow | RR Aware Studio |
In-app purchases
Attenuator
- Remove all ads$1.99
RadMonJP
- プレミアム1ヶ月$0.991 Month
- Bronze$4.991 Year
- Silver sponsor$9.991 Year
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- Gold sponsor$19.991 Year
- Platinum sponsor$49.991 Year
- Diamond sponsor$99.991 Year
