# RF vs Voltage Drop Calculators

The clearest difference is rating: RF at 4.9 against Voltage Drop Calculators's 4.0. RF also leads on ratings volume (22 vs 4) and iOS requirement (11.1 vs 15.6). Voltage Drop Calculators's advantage is price ($3.99 vs $7.99). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

RF costs $7.99 and Voltage Drop Calculators $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RF holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: RF has 22 ratings behind it against 4, so its average is the more settled of the two.

RF ships an update every 4 months, Voltage Drop Calculators every 7 months. The most recent releases landed on September 22, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | RF | Voltage Drop Calculators |
| --- | --- | --- |
| Price | $7.99 | **$3.99** |
| Rating | **[4.9 (22 ratings)](https://appshunter.io/ios/app/rf-toolbox-pro/id593044099/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/voltage-drop-calculators/id6464050324/reviews) |
| Number of ratings | **22** | 4 |
| Positive reviews | 91.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | Paid | Paid |
| Size | 92 MB | 67 MB |
| Requires iOS | **11.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marcus Roskosch](https://appshunter.io/developer/334053438) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## What reviewers say

### RF

[App page](https://appshunter.io/ios/app/rf-toolbox-pro/id593044099)

This app provides over 90 specialized tools for high-frequency electronics, catering to RF professionals, radio amateurs, and students. It offers calculations for PCB traces, filters, impedance, and more, with ongoing updates and new features planned.

**Highlights:** PCB Trace Width and Impedance, LC/L/T/Pi Match Calculation, Coax Cable Calculations, Amplifier and Attenuator Cascade, SWR/Reflection/Return Loss Conversion, Filter Design (Butterworth, Chebyshev), RF Units Conversion

**In-app purchases:** none


### Voltage Drop Calculators

[App page](https://appshunter.io/ios/app/voltage-drop-calculators/id6464050324)

This tool helps electrical professionals and students perform quick and accurate voltage drop calculations. It features a user-friendly interface, a material database, and the ability to save circuit details for efficient system design and compliance.

**Highlights:** Fast voltage drop calculations, Built-in material database, Custom material support, Save circuit details, Unit conversion, Recommended wire size guidance

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

**In-app purchases:** none


## Frequently asked questions

### Is RF free?

RF costs $7.99, with no in-app purchases.

### Is Voltage Drop Calculators free?

Voltage Drop Calculators costs $3.99, with no in-app purchases.

### Which has better reviews, RF or Voltage Drop Calculators?

RF is rated higher. RF averages 4.9 out of 5 from 22 ratings, while Voltage Drop Calculators averages 4.0 from 4 ratings.

### Do RF or Voltage Drop Calculators have ads?

Neither RF nor Voltage Drop Calculators shows ads.

### Which is updated more often, RF or Voltage Drop Calculators?

RF ships an update every 4 months, and Voltage Drop Calculators every 7 months. Most recently, RF was updated on September 22, 2026 and Voltage Drop Calculators on September 28, 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.*