Comparison

RMS Calculator vs TR

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

About

RMS Calculator

Features

Read full description

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.

About

TR

Features

Read full description

TR-48DSP is an automotive audio processor tuning app that allows users to adjust various sound quality effects to suit their personal listening preferences.

Screenshots

RMS Calculator2 screens

TR4 screens

Verdict

The call

The clearest difference is price: TR at Free against RMS Calculator's $1.99. TR also leads on update cadence (every 6 weeks vs every 15 months). On ads, in-app purchases, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

TR is free to download; RMS Calculator costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

RMS Calculator ships an update every 15 months, TR every 6 weeks. The most recent releases landed on November 7, 2026 and November 9, 2026 respectively.

Scorecard2 real differences · 4 level

RMS Calculator versus TR: the parameters behind the verdict, then further details
Parameter	RMS Calculator	TR
Price	$1.99	Free — better
Update frequency	Every 15 months	Every 6 weeks — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	12.0 — better	12.2
Further details — not scored
Size	8 MB	57 MB
Age rating	+4	17+
Developer	Kei Suefuji	伟陈

In-app purchases

None

RMS Calculator

No in-app purchases

None

TR

No in-app purchases

Questions

Is RMS Calculator free?

RMS Calculator costs $1.99, with no in-app purchases.

Is TR free?

TR is free to download, with no in-app purchases.

Do RMS Calculator or TR have ads?

Neither RMS Calculator nor TR shows ads.

Which is updated more often, RMS Calculator or TR?

RMS Calculator ships an update every 15 months, and TR every 6 weeks. Most recently, RMS Calculator was updated on November 7, 2026 and TR on November 9, 2026.