# splotRF vs RF calculator & Smith Chart

The clearest difference is in-app purchases: splotRF at none against RF calculator & Smith Chart's 1. splotRF also leads on update cadence (every 10 days vs every 4 months). RF calculator & Smith Chart's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. RF calculator & Smith Chart sells 1 one-off in-app purchase. splotRF asks for nothing beyond the download.

splotRF ships an update every 10 days, RF calculator & Smith Chart every 4 months. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | splotRF | RF calculator & Smith Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/splotrf/id1599892560/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 4 months |
| Monetization | Free | — |
| Size | 6 MB | 31 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DirectRF](https://appshunter.io/developer/1572692412) | [Anas Abubakar](https://appshunter.io/developer/1581534101) |

## What reviewers say

### splotRF

[App page](https://appshunter.io/ios/app/splotrf/id1599892560)

Visualize and analyze touchstone S-parameter data with interactive plots. Supports multiple file overlays, stability calculations, and various matrix conversions. Export data in vector graphics formats.

**Highlights:** Plot .snp format S-parameter data, Stability circles and µ/µ' analysis, Overlay multiple trace data, View data as a table, S/Y/Z matrix conversion, Smith Chart, Polar, and Rectangular plots, Export to PDF

**In-app purchases:** none


### RF calculator & Smith Chart

[App page](https://appshunter.io/ios/app/rf-calculator-and-smith-chart/id6757265018)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| upgrade to pro | $3.99 | one-time |


## Frequently asked questions

### Is splotRF free?

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

### Is RF calculator & Smith Chart free?

RF calculator & Smith Chart is free to download, with in-app purchases available.

### Do splotRF or RF calculator & Smith Chart have ads?

Neither splotRF nor RF calculator & Smith Chart shows ads.

### Which is updated more often, splotRF or RF calculator & Smith Chart?

splotRF ships an update every 10 days, and RF calculator & Smith Chart every 4 months. Most recently, splotRF was updated on October 24, 2026 and RF calculator & Smith Chart on October 22, 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.*