# iMSO2 vs Smith Charts

The clearest difference is price: iMSO2 at Free against Smith Charts's $3.99. iMSO2 also leads on rating (5.0 vs 3.7) and review sentiment (100% vs 67%). Smith Charts's advantage is update cadence (every 3 weeks vs every 2 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

iMSO2 is free to download; Smith Charts costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iMSO2 holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of iMSO2's written reviews are positive against 67% of Smith Charts's.

iMSO2 ships an update every 2 months, Smith Charts every 3 weeks. The most recent releases landed on September 15, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | iMSO2 | Smith Charts |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/imso2/id658508510/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/smith-charts/id1602503719/reviews) |
| Number of ratings | 2 | **3** |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 11 MB | 24 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oscium LLC](https://appshunter.io/developer/411757369) | [Edoardo Orzes](https://appshunter.io/developer/1665361246) |

## What reviewers say

### iMSO2

[App page](https://appshunter.io/ios/app/imso2/id658508510)

Analyze analog and digital signals on your mobile device using specialized hardware. Offers a demo mode for simulated wave display and measurements, with full functionality unlocked by purchasing the iMSO-204 mixed signal oscilloscope hardware.

**Highlights:** Analyze analog and digital signals, Simulated wave display, Cursors with measurements, Direct signal measurements, Analog and digital triggering, Hardware integration

**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 iMSO2 free?

iMSO2 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, iMSO2 or Smith Charts?

iMSO2 is rated higher. iMSO2 averages 5.0 out of 5 from 2 ratings, while Smith Charts averages 3.7 from 3 ratings.

### Do iMSO2 or Smith Charts have ads?

Neither iMSO2 nor Smith Charts shows ads.

### Which is updated more often, iMSO2 or Smith Charts?

iMSO2 ships an update every 2 months, and Smith Charts every 3 weeks. Most recently, iMSO2 was updated on September 15, 2026 and Smith Charts 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.*