# iSlipstick RF vs Smith Charts

The clearest difference is price: iSlipstick RF at Free against Smith Charts's $3.99. iSlipstick RF also leads on rating (4.7 vs 3.7) and review sentiment (100% vs 67%). Smith Charts's advantage is update cadence (every 3 weeks vs every 10 months) and device support (3 vs 1). On ratings volume, ads, in-app purchases and iOS requirement there is nothing between them.

iSlipstick RF is free to download; Smith Charts costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iSlipstick RF holds the better App Store score, 4.7 against 3.7. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews point the same way: 100% of iSlipstick RF's written reviews are positive against 67% of Smith Charts's.

iSlipstick RF ships an update every 10 months, Smith Charts every 3 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | iSlipstick RF | Smith Charts |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/islipstick-rf/id351775311/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/smith-charts/id1602503719/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 43 MB | 24 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sam Virgillo](https://appshunter.io/developer/324560825) | [Edoardo Orzes](https://appshunter.io/developer/1665361246) |

## What reviewers say

### iSlipstick RF

[App page](https://appshunter.io/ios/app/islipstick-rf/id351775311)

This app provides a comprehensive suite of calculators and converters specifically designed for radio frequency (RF) engineers and technicians. It includes tools for path loss, antenna gain, intermodulation, and standard electrical calculations, along with various unit conversions.

**Highlights:** RF-specific calculators, Standard electrical calculators, Unit converters, Path loss calculation, Intermodulation analysis, Antenna gain and beamwidth

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

**In-app purchases:** none


### Smith Charts

[App page](https://appshunter.io/ios/app/smith-charts/id1602503719)

Design matching networks, analyze device parameters, and compute stability circles with this interactive tool. Supports S parameters, various components, and offers advanced engineering features for RF design. Available in dark mode and exportable to PDF.

**Highlights:** Interactive Smith chart with drag and zoom, Design matching networks with various components, Compute stability, equi gain, and noise circles, Import S parameters from Touchstone files, Export designs to PDF, image, or file, Dark mode support, Ruler for wavelength measurement

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

**In-app purchases:** none


## Frequently asked questions

### Is iSlipstick RF free?

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

### Is Smith Charts free?

Smith Charts costs $3.99, with no in-app purchases.

### Which has better reviews, iSlipstick RF or Smith Charts?

iSlipstick RF is rated higher. iSlipstick RF averages 4.7 out of 5 from 3 ratings, while Smith Charts averages 3.7 from 3 ratings.

### Do iSlipstick RF or Smith Charts have ads?

Neither iSlipstick RF nor Smith Charts shows ads.

### Which is updated more often, iSlipstick RF or Smith Charts?

iSlipstick RF ships an update every 10 months, and Smith Charts every 3 weeks. Most recently, iSlipstick RF was updated on October 23, 2026 and Smith Charts on October 24, 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.*