# RF Path vs iSmith

The clearest difference is price: iSmith at Free against RF Path's $2.99. iSmith also leads on rating (5.0 vs 3.5) and update cadence (every 2 days vs every 5 months). RF Path's advantage is ads (none vs shown) and chart position (#165 vs unranked). On in-app purchases there is nothing between them.

iSmith is free to download; RF Path costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iSmith holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

RF Path ships an update every 5 months, iSmith every 2 days. The most recent releases landed on September 21, 2026 and June 6, 2026 respectively.

## The numbers

| Metric | RF Path | iSmith |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [3.5 (4 ratings)](https://appshunter.io/ios/app/rf-path/id1350255203/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ismith/id6444874930/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 days** |
| Monetization | Paid | **Ad-supported** |
| Best chart rank | **#165** | — |
| Size | 15 MB | 7 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tom Doherty](https://appshunter.io/developer/1112286724) | [Ryoun Chon Shin](https://appshunter.io/developer/1657565687) |

## What reviewers say

### RF Path

[App page](https://appshunter.io/ios/app/rf-path/id1350255203)

**Currently charting:** #165 Top Paid · Productivity (US App Store)

Calculate radio frequency propagation loss using various models like Irregular Terrain, Okumura-Hata, and COST-231. Supports area and point-to-point predictions, with results exportable via email or social media.

**Highlights:** Multiple propagation models (Irregular Terrain, Okumura-Hata, COST-231), Area Prediction mode, Point-to-Point prediction mode, Elevation profile display, Results export (CSV), Save to iCloud, Share to social media

**Features:** Vision Pro support

**In-app purchases:** none


### iSmith

[App page](https://appshunter.io/ios/app/ismith/id6444874930)

This app helps users understand impedance matching principles. It allows for reading key network parameters from a Smith chart and calculating various matching networks and pads. Users can also convert between different power and voltage units.

**Highlights:** Read Smith chart parameters (Z, Y, VSWR, Q, Gamma), Calculate 8 L-matching networks, Calculate T & Pi matching pads, Set matching targets on Smith chart, Learn impedance matching principles, dBm, Watts, and Volts conversion, VSWR conversion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RF Path free?

RF Path costs $2.99, with no in-app purchases.

### Is iSmith free?

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

### Which has better reviews, RF Path or iSmith?

iSmith is rated higher. RF Path averages 3.5 out of 5 from 4 ratings, while iSmith averages 5.0 from 1 ratings.

### Do RF Path or iSmith have ads?

iSmith shows ads; RF Path does not.

### Which is updated more often, RF Path or iSmith?

RF Path ships an update every 5 months, and iSmith every 2 days. Most recently, RF Path was updated on September 21, 2026 and iSmith on June 6, 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.*