Apps by Kei Suefuji
RMS Calculator app icon

Utilities

RMS Calculator

Kei Suefuji

$1.99 In-app purchases unconfirmed
Open on Apple

About this app

How should the effective value be calculated? What is the amplitude of the effective value of 100V? In such a case, do you have any experience of calculating the effective value while checking the calculation formula every time? This app can quickly convert the effective value and amplitude of AC waveforms. There are 4 types of conversion units: rms value, average value, amplitude, and Peak to Peak Amplitude. By inputting the amplitude or effective value of the AC waveform and selecting the unit of the input value, the value converted into 4 types of units will be displayed.

Latest release

What’s New

Version 1.3.0 Jan 19, 2026

Minor improvements.

Audience growth

Ratings growth

Steady
7-day gain +0
Ratings / day 0.0
30-day gain +0
US rating-count history
0 ratings
0 Aug 13, 2026 · 0 ratings Aug 13, 2026

Baseline captured. Growth appears after the crawler observes a changed rating count.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

Price tracking

Price intelligence

1 captured event
Current $1.99
Historical low USD 1.99
Paid → free
Price history
Current $1.99
$1.99 $1.00 Free Aug 13, 2026 · $1.99 Aug 13, 2026

First snapshot captured. The trend line starts after the next crawler price observation.

  1. First observed Aug 13, 2026 · 4:18 AM $1.99

Screenshots

RMS Calculator iPhone screenshotRMS Calculator iPhone screenshot RMS Calculator iPad screenshotRMS Calculator iPad screenshot