# Thetis Tools vs Smith Charts

The clearest difference is price: Thetis Tools at Free against Smith Charts's $3.99. Smith Charts's advantage is update cadence (every 3 weeks vs every 7 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

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

Thetis Tools ships an update every 7 months, Smith Charts every 3 weeks. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Thetis Tools | Smith Charts |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/smith-charts/id1602503719/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | — | Paid |
| Size | 50 MB | 24 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thetis srl](https://appshunter.io/developer/397584184) | [Edoardo Orzes](https://appshunter.io/developer/1665361246) |

## What reviewers say

### Thetis Tools

[App page](https://appshunter.io/ios/app/thetis-tools/id1460268980)

**Features:** macOS Compatibility

**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 Thetis Tools free?

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

### Is Smith Charts free?

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

### Do Thetis Tools or Smith Charts have ads?

Neither Thetis Tools nor Smith Charts shows ads.

### Which is updated more often, Thetis Tools or Smith Charts?

Thetis Tools ships an update every 7 months, and Smith Charts every 3 weeks. Most recently, Thetis Tools was updated on October 26, 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.*