By Hamady Free Editors' Rating

Editors' Review Staff Jan 23, 2011

Not so long ago, the typical science or research lab was filled with large, heavy instruments, each designed to do just one thing. Now scientists, engineers, and amateurs alike can download lab-grade instruments for free. For example, there's SigmaGraph, a free plotting and analysis tool from SIDI. It offers scientific graphing, curve fitting, editable data sheets, drawing tools, a scripting engine, and more.

SigmaGraph consists of three parts: the SigmaConsole, a mathematical tool that's sort of like a tiny virtual blackboard; the SigmaGraph interface, with a typical Windows layout; and the SigmaTray icon, which resides in the System Tray. You can have multiple instances of SigmaGraph and SigmaConsole open at once, and you can toggle the Console Window and Output Window open and closed from SigmaGraph's toolbar. We clicked New Graph icon, which opened the Datasheet template. After monkeying around for a while, we created a simple, attractive graph, which we saved as a SigmaGraph Document (.sid) and then reopened for editing. The Add/Remove Curve wizard made quick work of configuring not only the curve's axes but also the color, size, and style of the line in the display. SigmaGraph has far too many settings and options to cover, but we'll mention one that seemed especially helpful: a Templates Manager that can quickly create customized templates from a drop-down list and data plot. The SigmaConsole, aka Mathematical Console, is a simple but flexible math tool for everything from jotting down calculations to doing physics and higher math. The Constants menu offers Pi as well as Boltzmann, Planck, and other constants, and the Functions menu includes a Trigonometric submenu. Extras include a handy number pad display and an even handier Variables wizard, a tiny pop-up for adding and editing custom variables. We also successfully imported and exported ASCII data. However, it seems we just scratched the surface of SigmaGraph's capabilities.

SigmaGraph is a fine example of the tremendously powerful scientific resources that are freely available to all these days. It bundles not just software utilities but what would be a whole lab full of data-plotting machinery and instruments into one free download. Now that's scientific progress!

Full Specifications

What's new in version 2.6.8

Improvements and bug fixes, including: SVG support improved with Unicode support. Datasheet performance improved. Plot autoscale function rewritten with a new fast algorithm.


Release January 2, 2017
Date Added January 2, 2017
Version 2.6.8

Operating Systems

Operating Systems Windows 10, Windows 2003, Windows 8, Windows Vista, Windows, Windows Server 2008, Windows 7, Windows XP
Additional Requirements None


Total Downloads 4,918
Downloads Last Week 0
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Developer's Description

SigmaGraph is a data plotting and analysis software designed to be lightweight, reliable and easy to use. SigmaGraph runs on XP, Vista and Windows 7/8/10. SigmaGraph offers almost all the functionality needed by scientists and engineers: editable datasheets (column properties, create series, set column values by using any mathematical expression, show column statistics, import/export from/to ASCII file, mask and unmask cells, printing); scientific graphing with a complete control of the graph (line/symbol style, colors, fonts, legends, axis properties, grid, tick, labels, scale, auto scale, log/linear scale, zoom in/out, copy format to another graph, export as image, printing); curve fitting (24 models including linear, polynomial, exponential, Gaussian (up to 5 peaks), Lorentzian (up to 5 peaks), Pearson VII, logistic, power, and user-defined models); error bars (percentage, constant or any user defined data); drawing tools (line, rectangle, ellipse); mathematical console; Scripting engine.