# Smith Charts

> Interactive Smith chart tool for RF engineering and matching network design. (iPhone/iPad app by Edoardo Orzes.)

- Source: https://appshunter.io/ios/app/smith-charts/id1602503719 (this page in markdown: same URL + `.md`)
- Developer: [Edoardo Orzes](https://appshunter.io/developer/1665361246)
- Category: Productivity, Utilities
- Price: $3.99
- Rating: 3.67/5 from 3 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 24 MB
- Languages: English
- Released: 2021-12-29
- Data updated: 2026-07-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/smith-charts/id1602503719/reviews.md

## What is Smith Charts?

A great experience of the Smith chart. Also in dark mode.
Design matching networks, insert S parameters and convert them, or import from touchstone file.
Compute stability circles, equi gain and noise circles. 
Easy interaction with the Smith chart.
This chart can easily replace a physical one, making its use much faster.

Smith chart interactivity:

- Works on iPhone, iPad and Mac (on Apple Silicon).
- Drag and zoom in the chart.
- Create multiple Smith Charts and name them.
- Switch easily between input and output planes.
- Use a ruler and drag it to obtain the wavelength toward generator of a point on the chart, instantly.
- Tap the chart to show the coordinates in algebraic notation, you will see also magnitude and phase of that location, and the corresponding impedance.
- Insert circles by hand; modify the radius dragging a circle to keep the center in place, or press to translate them and modify the radius keeping the opposite side in place. Then use the padlock button to disable interaction of gestures with circles.
- You can also insert a custom circle and a segment in the input and in the output plane, defining its center and radius in a textfield.
- Export to file, image or PDF

Advanced tools for engineering: 

Matching networks:

- Choose electronic components to design a matching network for your device.
- Available components are: L, C, R, Z and lines (transmission line, parallel or series stub, open or shorted).
- For each component it is possible to specify the parasites.
- For transmission lines, it is possible to choose between Z0, K or L, C representations, and converting between the two (also for parasites).
- Tapping on a component it is added to the network and the impedance seen from your device toward the matching network is shown on the smith chart.
- You can create a matching network both for input and output planes of the device.
- Each network has its own termination (source or load), which can be a one port device or a two ports device where you can choose a termination for the second port.
- Each termination can be defined by network parameters (S, Z, Y or h) and the parameters can be imported from a touchstone file.
- Components supported: Resistor, Capacitor, Inductor, General impedance (R+jX), Transmission line, Parallel stub, series Stub (both shorted or open).
- Each component can be cascaded in series or in parallel, no limits of components.
- You can choose a frequency for the impedance calculation and a frequency span for the plot on the Smith Chart.
- For S parameters, you can specify a dedicated characteristic impedance, the tool will renormalize the Γ of that termination to be correctly shown on the Smith chart, when the smith chart is defined on a different characteristic impedance.

Device analysis:

- You can insert the following parameters of a device: network parameters (S, Z, Y or h), specifications (Ga, Gp, Gt, NF), noise data (gamma s optimum noise, minimum NF, rn) and the input/output reflection coefficients.
- You can convert network parameters (S, Z, Y, h), and the port type (Γ, Z, Y).
- While you are inserting data, you will see the computed results appearing on the chart and on the relative fields.
- Results representable on the smith chart: input/output stability circles, power gain and noise circles (equiGa, Gp, Gt, NF circles), reflection coefficients towards load and source and optimum power coefficients.
- Other results: obtained power gains and noise (Ga, Gp, Gt, NF) and stability (D, K, kind of stability).
- You can display on the Smith chart the input impedance of your component versus frequency (as a function of load impedance) when importing a touchstone file.
- For S parameters, you can specify a different characteristic impedance and the tool will automatically convert it to the one defined for the Smith chart, it will let you know the new renormalized parameters.

## Key features

- 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

## Chart rankings

- #193 in Top Paid · Productivity (US App Store)

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/smith-charts/id1602503719/reviews.md

### 5/5 — nice

*2025-08-20*

can you add the Y version of smith chart as well

### 1/5 — Gives completely wrong impedance values

*2023-04-04*

I bought app specifically because the description said it would give you the specific coordinate values, including the magnitude and angle of the impedance and I wanted to get precise values instead of estimating from a paper chart.  Well it does do that, but the values it gives are utter nonsense.  I have no idea where it’s getting its numbers from, but they have no clear relationship to the actual coordinates on the chart.  I’m very disappointed.

**Developer response:** Hello, I’m sorry for this, please contact me with the email support to solve. Anyway the values you see are correct, the ones that appears on the top right corner tapping on the chart are denormalisied (multiplied by 50ohm): The ones on top are the modulo and phase, on bottom the corresponding impedance, then the values on the red dot are the Cartesian coordinates relative to the plane. Again, if that does not makes sense, please contact me. Thanks.

### 5/5 — Nice try but the lines (all) appear zigzag when zooming in.

*2022-09-24*

Nice try but the lines (all) appear zigzag when zooming in (or without zooming in). Could you please try fixing this big flaw so I can start using my iPad Pro 12.9” (2018) for this application? 

Overall, lines don’t look good. 

With Kind Regards!!!

**Developer response:** I really appreciated your comment. 
Soon an update will fix this issue. Thanks!

## Frequently asked questions about Smith Charts

### What is Smith Charts used for?

Smith Charts is used for designing matching networks, analyzing device parameters, and computing stability and noise circles in RF engineering. It provides an interactive digital representation of the Smith chart for faster and more efficient use compared to physical charts.

### What devices does Smith Charts support?

Smith Charts is available for iPhone, iPad, and Mac devices with Apple Silicon. This broad compatibility allows users to work on their projects across different Apple platforms.

### Can I import data into Smith Charts?

Yes, you can import S parameters from Touchstone files directly into Smith Charts. This feature allows for seamless integration with existing project data and external measurement equipment.

### What types of components can be used for matching networks?

Smith Charts supports a variety of electronic components for designing matching networks, including L, C, R, Z, and transmission lines (parallel or series stubs). Parasites can also be specified for each component.

### Does Smith Charts offer dark mode?

Yes, Smith Charts includes a dark mode option, which can enhance user experience and reduce eye strain during extended use, especially in low-light conditions.

### How can I export my designs from Smith Charts?

You can export your designs from Smith Charts in multiple formats, including PDF, image files, and standard files. This makes it easy to share your work or incorporate it into reports and presentations.

### What is the price of Smith Charts?

Smith Charts is a paid application priced at $3.99. This one-time purchase grants access to all its features for RF engineering and design.

### How often is Smith Charts updated?

Smith Charts was last updated on March 31, 2025, with version 3.0.1. This indicates a commitment to ongoing development and improvements for the application.

## Version history (last 5 releases)

### 3.0.1 — 2025-03-31

A complete redesign of the app, with tons of new features!

- Matching networks design: choose among many components and see on the chart the obtained impedance
- Use sliders to see how the impedance changes varying the properties of the components

- Network parameters conversions (S, Z, Y, h)
- Termination conversions (Γ, Z, Y)
- Touchstone compatibility (one / two ports)
- Export to file, image or PDF

(3.0.1 bug fixes)

### 3.0 — 2025-03-26

A complete redesign of the app, with tons of new features!

- Matching networks design: choose among many components and see on the chart the obtained impedance
- Use sliders to see how the impedance changes varying the properties of the components

- Network parameters conversions (S, Z, Y, h)
- Termination conversions (Γ, Z, Y)
- Touchstone compatibility (one / two ports)
- Export to file, image or PDF

### 2.7.1 — 2022-10-24

iPadOS 16 compatibility

### 2.7 — 2022-10-14

- New handle to resize SideView
- Space optimisation for all devices

* Bug fixes

### 2.6 — 2022-10-12

Preparation for iPadOS 16 Stage Manager.

- bug fixes and improvements for all devices.

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## More apps by Edoardo Orzes

- [BLE Scanner IoT](https://appshunter.io/ios/app/ble-scanner-iot/id1644302159)
- [CalcMe Calculator](https://appshunter.io/ios/app/calcme-calculator/id1662123996)
- [Bode Plot Calculator](https://appshunter.io/ios/app/bode-plot-calculator/id6496601138)

All apps by Edoardo Orzes: https://appshunter.io/developer/1665361246

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-27.*