# RMS Calculator vs TR

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.

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.

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.

## The numbers

| Metric | RMS Calculator | TR |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 6 weeks** |
| Size | 8 MB | 57 MB |
| Requires iOS | **12.0** | 12.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 17+ |
| Developer | [Kei Suefuji](https://appshunter.io/developer/1388335881) | [伟 陈](https://appshunter.io/developer/1837176650) |

## What reviewers say

### RMS Calculator

[App page](https://appshunter.io/ios/app/rms-calculator/id1511092361)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### TR

[App page](https://appshunter.io/ios/app/tr-48dsp/id6754761836)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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.

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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.*