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Radical Pie is a software application that provides a WYSIWYG editor for creating mathematical equations.^[1] It generates output of high professional quality for use in publications such as technical papers, textbooks, and presentation slides. Radical Pie distinguishes itself from other formula editors by including tools for drawing and annotations that can attach items such as arrows, highlights, and labels to anchor points within a mathematical expression.

The Radical Pie editor includes numerous mathematical symbols and structures that are accessed through an array of palettes. It can operate in three different modes for math, chemistry, and general text input. The editor has particularly broad support for Unicode characters and even supports the inclusion of emoji in mathematical expressions. Radical Pie comes with a special mathematical font with hundreds of symbols designed to have a look consistent with the Times New Roman font.

The mathematical structures available in the editor's palettes include brackets, scripts, fractions, radicals, iterations, integrals, limits, over/under marks, matrices, and arrows. Each appearance of each type of structure can be customized by the user through "design" dialogs that allow a large number of parameters controlling spacing, line thickness, arrow shape, etc., to be modified in order to suit preferences.

In addition to equation editing features, Radical Pie includes a variety of drawing tools that let the user create objects such as highlights, boxes, and arrows that are not part of the main equation but instead attach to anchor points within the equation. These objects remain live as an equation is further edited so that they move with the anchor points and resize as necessary. Annotations can be attached to drawing objects to add dynamic labels to an equation, and these labels can be entire equations on their own to which additional drawing objects may be attached.

Radical Pie can save to SVG, EMF, and PDF formats as well as a native text format based on the Open Data Description Language.^[2]

Radical Pie was designed to interoperate with Microsoft Word through Windows OLE technology. Buttons for inserting equations and updating their designs are added to Word's Insert pane. Equations embedded in a Word document can be edited by simply double-clicking on them. When an equation is added to a document, Radical Pie automatically detects the font size of the surrounding text and initializes the editor with the same size.

Radical Pie was created by computer scientist Eric Lengyel. It leverages his previous work on font rendering and digital typography developed for the Slug Library. It also makes use of other technologies developed by Lengyel such as OpenDDL for its native file format.

• Formula editor
• MathType

• Official website