# Global Time Machine vs RF Power Calculator

The clearest difference is rating: RF Power Calculator at 5.0 against Global Time Machine's 3.7. RF Power Calculator also leads on in-app purchases (none vs 2) and iOS requirement (9.0 vs 17.0). Global Time Machine's advantage is ratings volume (7 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Global Time Machine sells 2 in-app purchases, starting at $0.99 per month. RF Power Calculator asks for nothing beyond the download.

RF Power Calculator holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Global Time Machine has 7 ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | Global Time Machine | RF Power Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (7 ratings)](https://appshunter.io/ios/app/global-time-machine/id1082674619/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rf-power-calculator/id1236169476/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 58.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | — |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 4 MB |
| Requires iOS | 17.0 | **9.0** |
| Devices | iPhone, Mac, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [theMakeApp](https://appshunter.io/developer/1014975385) | [TriMM Multimedia B.V.](https://appshunter.io/developer/522403263) |

## What reviewers say

### Global Time Machine

[App page](https://appshunter.io/ios/app/global-time-machine/id1082674619)

Visualize all your important time zones on a single, interactive line. Plan meetings and calls across different regions with ease, and see day and night cycles at a glance. Includes calendar integration and automatic location detection.

**Highlights:** World clock for 34,000+ cities, Drag to travel in time, Day and night at a glance, Calendar integration, Automatic location detection, Offline functionality

**Features:** Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium · Monthly | $0.99 | per month |
| Premium · Yearly | $9.99 | per year |


### RF Power Calculator

[App page](https://appshunter.io/ios/app/rf-power-calculator/id1236169476)

This app provides essential RF-related calculations for designers and enthusiasts. It includes conversions for series/parallel networks, thermal resistance, units, and VSWR to return loss.

**Highlights:** Series & Parallel Network conversion, Thermal resistance calculations, Unit conversion (Power, Distance, Ratio), VSWR to Return Loss conversion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Global Time Machine free?

Global Time Machine is free to download, with in-app purchases available.

### Is RF Power Calculator free?

RF Power Calculator is free to download, with no in-app purchases.

### Which has better reviews, Global Time Machine or RF Power Calculator?

RF Power Calculator is rated higher. Global Time Machine averages 3.7 out of 5 from 7 ratings, while RF Power Calculator averages 5.0 from 1 ratings.

### Do Global Time Machine or RF Power Calculator have ads?

Neither Global Time Machine nor RF Power Calculator shows ads.

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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.*