# splotRF

> S-parameter touchstone data visualization and analysis tool. (iPhone/iPad app by DirectRF.)

- Source: https://appshunter.io/ios/app/splotrf/id1599892560 (this page in markdown: same URL + `.md`)
- Developer: [DirectRF](https://appshunter.io/developer/1572692412)
- Category: Productivity, Utilities
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 18.0 · 6 MB
- Languages: English
- Released: 2021-12-12
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/splotrf/id1599892560/reviews.md

## What is splotRF?

Key Features:
• plots .snp format s-parameter touchstone data
• stability circles for load and source
• µ and µ' for load and source stability
• interactive data markers
• overlay multiple trace data on a single plot
• overlay trace data from multiple files
• view data as a table list 
• arbitrary number of ports (.s1p, .s2p, s3p…snp support)
• S/Y/Z matrix conversion
• mA/RI/dB formatting
• interpolation over frequency
• exports vector graphics to .pdf
• plotting display properties and configuration are saved within file comments
• automated grid layout
• Smith Chart, Polar and Rectangular plots
• reads and plots .zip archives containing s-parameter data

## Key features

- 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


## Frequently asked questions about splotRF

### What file formats does splotRF support for S-parameter data?

splotRF can plot data in the .snp format, including .s1p, .s2p, and s3p files. It also reads and plots .zip archives containing s-parameter data.

### Can I compare data from different files in splotRF?

Yes, splotRF allows you to overlay trace data from multiple files on a single plot, making it easy to compare different configurations or measurements.

### What types of plots are available in splotRF?

splotRF offers Smith Chart, Polar, and Rectangular plot types to visualize your S-parameter data in various ways.

### Does splotRF offer any stability analysis features?

Yes, splotRF calculates stability circles for load and source, as well as µ and µ' values for load and source stability.

### How can I export my data from splotRF?

You can export your plotted data as vector graphics to .pdf files, allowing for high-quality inclusion in reports and presentations.

### Is splotRF available on multiple devices?

splotRF is supported on Mac, iPhone, and iPad, offering flexibility for users across different Apple platforms.

### How often is splotRF updated?

The latest version, 3.1.4, was last updated on September 23, 2025. The app was initially released on December 12, 2021.

### What is the user sentiment for splotRF based on ratings?

splotRF has received excellent user feedback, indicated by its perfect 5.0-star rating from 2 reviews.

## Version history (last 5 releases)

### 3.1.4 — 2025-09-23

• Fixed incorrect MaxGain marker display for multi-mode markers

### 3.1.3 — 2025-09-20

Bug fixes and performance improvements

### 3.1.2 — 2025-08-25

• Fixed bug with Axis limits on iOS
• Fixed issue with Smith Chart scaling when adding new trace

### 3.1.1 — 2025-08-17

• Stability Analysis for 2-port networks:
    • Added ability to plot µ-factor for load and source
    • Added ability to plot stability circles for load and source
    • Added max stable gain

• Improved autoscaling
• Improved pinch zooming for right y-axis
• Markers on stability circles now show impedance

### 3.1.0 — 2025-08-16

• Stability Analysis for 2-port networks:
    • Added ability to plot µ-factor for load and source
    • Added ability to plot stability circles for load and source
    • Added max stable gain

• Added plot zooming using scroll wheel
• Improved autoscaling
• Fixed other minor bugs

## Apps similar to splotRF

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [irBoard Lite](https://appshunter.io/ios/app/irboard-lite/id432058811) | — | Free | Productivity |
| [Ask-AI](https://appshunter.io/ios/app/ask-ai/id1667973468) | — | Free | Productivity |
| [iGate](https://appshunter.io/ios/app/igate/id937460915) | 1.8 (29) | Free | Productivity |
| [VDScan](https://appshunter.io/ios/app/vdscan/id1446737725) | 4.5 (562) | $14.99 | Productivity |
| [Emburse Spend](https://appshunter.io/ios/app/emburse-spend/id1609492240) | 2.8 (18) | Free | Productivity |
| [i48](https://appshunter.io/ios/app/i48/id329454950) | 3.5 (196) | Free | Productivity |

## More apps by DirectRF

- [matchedRF](https://appshunter.io/ios/app/matchedrf/id1572692410)
- [lineupCalcRF](https://appshunter.io/ios/app/lineupcalcrf/id6737461042)

All apps by DirectRF: https://appshunter.io/developer/1572692412

## Related topics

[pfsspideslots](https://appshunter.io/ios/topics/pfsspideslots) · [gspuitslots](https://appshunter.io/ios/topics/gspuitslots)

---

*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 2026-06-01.*