# Smith Charts vs iSmith

The clearest difference is price: iSmith at Free against Smith Charts's $3.99. iSmith also leads on rating (5.0 vs 3.7) and update cadence (every 2 days vs every 3 weeks). Smith Charts's advantage is ads (none vs shown) and ratings volume (3 vs 1). On in-app purchases, device support and iOS requirement there is nothing between them.

iSmith is free to download; Smith Charts costs $3.99 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 3.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Smith Charts ships an update every 3 weeks, iSmith every 2 days. Both last shipped on September 21, 2026.

## The numbers

| Metric | Smith Charts | iSmith |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/smith-charts/id1602503719/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ismith/id6444874930/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Paid | **Ad-supported** |
| Size | 24 MB | 7 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Edoardo Orzes](https://appshunter.io/developer/1665361246) | [Ryoun Chon Shin](https://appshunter.io/developer/1657565687) |

## What reviewers say

### 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


### 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 Smith Charts free?

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

### Is iSmith free?

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

### Which has better reviews, Smith Charts or iSmith?

iSmith is rated higher. Smith Charts averages 3.7 out of 5 from 3 ratings, while iSmith averages 5.0 from 1 ratings.

### Do Smith Charts or iSmith have ads?

iSmith shows ads; Smith Charts does not.

### Which is updated more often, Smith Charts or iSmith?

Smith Charts ships an update every 3 weeks, and iSmith every 2 days. Most recently, Smith Charts was updated on September 21, 2026 and iSmith on September 21, 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.*