TstoneLab is a professional Touchstone file (.snp) analyzer built for RF and microwave engineers. Visualize, analyze, and present S-parameter data with an intuitive, modern interface.

Key Features

Charts & Visualization

* Cartesian and Smith Chart rendering for S-parameter data

* Multi-file overlay to compare multiple Touchstone files on a single chart

* Support for up to 99-port files (.s1p through .s99p)

* Multi-pane layout for viewing multiple charts simultaneously

* 5 built-in color palettes with per-trace color customization

Markers & Analysis

* 8 independent frequency markers

* Coupled Marker mode for synchronized frequency tracking across traces

* Directional Peak/Valley search (left/right)

* Group Delay calculation with auto-scaled time units (ms/us/ns/ps)

* Complex number display formats (Polar, Magnitude-Angle)

Mixed-Mode Analysis (MMA)

* Mixed-Mode S-parameter analysis for 4-port networks (Sdd/Sdc/Scd/Scc)

* Port renumbering and subset selection

* Touchstone file export

DecoChart — Chart Decoration

* Presentation-ready chart decoration engine

* Fine-grained styling for canvas, title, axes, traces, and legend

* Company logo overlay with opacity and positioning controls

* PNG export and copy to clipboard

Touchstone Editor

* Syntax-highlighted text editor for Touchstone files

* Line-by-line frequency info panel

* Find and save functionality

File Explorer

* Hierarchical TreeView-based file browser

* Unified recent files and folders