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RAPTOR - Flowchart Interpreter

Build and trace flowchart programs to learn algorithmic thinking with RAPTOR. This Windows download is the free Avalonia edition, which requires .NET Runtime 8 and supports procedures but not object-oriented mode.

WindowsFree; publisher describes the RAPTOR core as public domain and the NClass UML component as GPL-licensed.
Download RAPTOR Avalonia for Windows (MSI)

Direct publisher file

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What is RAPTOR - Flowchart Interpreter?

RAPTOR is a visual programming environment for students learning how algorithms work. Rather than starting with a page of source code, you assemble a flowchart and follow its execution through the diagram. Assignment, input, output, selection and loop symbols make the structure of a program visible.

The linked Windows MSI is RAPTOR Avalonia, the multiplatform edition listed by the publisher with a July 10, 2025 update. Its Intermediate mode supports subcharts and procedures, and it accepts international variable names. Install .NET Runtime 8 separately if it is not already present; documentation for this edition is provided online.

Check the edition required by your course before exchanging files. Avalonia has no object-oriented mode. The separate legacy Windows-only edition supports OO mode but cannot open Avalonia files. The publisher also warns that older binary-format programs need the .oldrap extension before opening in Avalonia and recommends saving them in the newer XML-based .rap format. The first screenshot shows Avalonia; the second shows the legacy Windows interface for comparison.

What it offers

  • Create visual programs with assignment, input, output, selection and loop symbols.
  • Trace execution through a flowchart to examine algorithm logic.
  • Organize programs into subcharts and procedures in Avalonia Intermediate mode.
  • Use international variable names in the Avalonia edition.

Good to know

  • RAPTOR Avalonia requires .NET Runtime 8 and does not include object-oriented mode.
  • Legacy Windows-only RAPTOR cannot open Avalonia files; Avalonia can load only some legacy files.
  • For older binary-format programs, the publisher instructs users to rename files to .oldrap before opening and migrate them to XML-based .rap files.

Product images

RAPTOR Avalonia on Windows showing a loop flowchart, symbol palette and a Chinese variable value.
RAPTOR Avalonia on Windows showing a loop flowchart, symbol palette and a Chinese variable value. Image source ↗Screenshot displayed on the RAPTOR publisher homepage as Figure 2, RAPTOR Avalonia. Used to illustrate the application UI; no separate screenshot reuse license or express permission was found. Publisher software public-domain statement is not proof of permission for every screenshot element.
Legacy Windows RAPTOR interface with assignment, input, output, selection and loop symbols beside a Start-to-End flowchart.
Legacy Windows RAPTOR interface with assignment, input, output, selection and loop symbols beside a Start-to-End flowchart. Image source ↗Legacy Windows screenshot displayed in the Softonic RAPTOR gallery. UI and image rights remain with their respective owners; no express redistribution license or permission was established. Illustrative comparison, not a screenshot of the linked Avalonia build.

Sources

References used for this listing. Retrieval dates do not indicate hands-on testing.

  1. RAPTOR - Flowchart Interpreter ↗Retrieved
  2. RAPTOR - Flowchart Interpreter - Download ↗Retrieved

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