# Smith Charts vs SecondBrain Pro

The clearest difference is price: SecondBrain Pro at Free against Smith Charts's $3.99. Smith Charts's advantage is in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 2 months). On ads and device support there is nothing between them.

SecondBrain Pro is free to download; Smith Charts costs $3.99 up front. SecondBrain Pro sells 2 one-off in-app purchases. Smith Charts asks for nothing beyond the download.

Smith Charts ships an update every 3 weeks, SecondBrain Pro every 2 months. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Smith Charts | SecondBrain Pro |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/smith-charts/id1602503719/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Paid | — |
| Size | 24 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Edoardo Orzes](https://appshunter.io/developer/1665361246) | [Heinrich Krupp](https://appshunter.io/developer/1866842398) |

## 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


### SecondBrain Pro

[App page](https://appshunter.io/ios/app/secondbrain-pro/id6757423935)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $7.99 | one-time |
| SecondBrain PREMIUM | $17.99 | one-time |


## Frequently asked questions

### Is Smith Charts free?

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

### Is SecondBrain Pro free?

SecondBrain Pro is free to download, with in-app purchases available.

### Do Smith Charts or SecondBrain Pro have ads?

Neither Smith Charts nor SecondBrain Pro shows ads.

### Which is updated more often, Smith Charts or SecondBrain Pro?

Smith Charts ships an update every 3 weeks, and SecondBrain Pro every 2 months. Most recently, Smith Charts was updated on November 6, 2026 and SecondBrain Pro on October 31, 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.*