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SwiftForth

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What SwiftForth is

SwiftForth is an interactive Forth development environment for creating native desktop applications on Windows, Linux, and macOS. Its rule-based optimizing compiler works without an external compiler, assembler, or linker. Applications can call native operating-system functions and access system functions and dynamic libraries. SwiftForth includes SWOOP, a Forth object-oriented programming system, plus a cross-reference tool, source browser, disassembler/decompiler, and single-step debugger. A fully licensed version includes source code for the kernel, IDE, and features, together with a cross compiler for customizing the kernel. PDF documentation contains the SwiftForth Reference Manual, Forth Standard, and Forth Programmer’s Handbook. Free evaluation versions for Windows, Linux, and macOS have no time limit. Requirements list Windows 10 or later, macOS Catalina or later, Linux kernel 6.8 or later, and an i386-compatible CPU. The SwiftForth license costs $399, paid once, while support renewal costs $129 a year.

Who it suits

SwiftForth suits Forth programmers building native desktop software who need operating-system access, debugging, and build tools. It is also aimed at corporations, government organizations, and entrepreneurs.

What it does well

  • Native Windows, Linux, and macOS apps
  • Optimizing compiler included
  • Built-in debugger and source tools
  • Kernel and IDE source included
  • Unlimited software updates with license

What to know first

  • No free plan
  • License costs $399, paid once
  • Support renewal costs $129 a year
  • Requires an i386-compatible CPU

Plans

PlanBilled and limitsPrice
SwiftForth support renewal$129/year · Annual support subscription · Updates issued during the support period are free$129 a year
SwiftForth license$399.00 · Perpetual use · Windows, Linux, and macOS · One year of email tech support and unlimited software updates$399, paid once

As forth.com lists them, read 8 Oct 2026. The maker's own page has the final word.

Verdict

SwiftForth provides a complete Forth desktop development environment with native access, compiler tools, debugging, and source customization. A perpetual license includes one year of email support and unlimited software updates, with annual renewal afterward.

Facts from SwiftForth's own pages

Compiler and tools
SwiftForth includes a rule-based optimizing compiler and does not require an external compiler, assembler, or linker. · forth.com, 8 Oct 2026
Debugging
Debugging tools include a cross-reference tool, source browser, disassembler/decompiler, and single-step debugger. · forth.com, 8 Oct 2026
Documentation
PDF documentation is included and comprises the SwiftForth Reference Manual, Forth Standard, and Forth Programmer’s Handbook. · forth.com, 8 Oct 2026
Evaluation
Free evaluation versions have no time limit; the download page describes SwiftForth evaluations for Windows, Linux, and macOS. · forth.com, 8 Oct 2026
Intended users
FORTH, Inc. describes its development systems as tools for the programming community and says its clients include corporations, government organizations, and entrepreneurs. · forth.com, 8 Oct 2026
Native system access
Applications can use native operating-system calls and functions, and SwiftForth provides access to system functions and dynamic libraries. · forth.com, 8 Oct 2026
Object-oriented programming
SwiftForth includes SWOOP, a Forth object-oriented programming system. · forth.com, 8 Oct 2026
Platform requirements
The product page lists Windows 10 or later, macOS Catalina or later, and Linux kernel 6.8 or later, and requires an i386-compatible CPU. · forth.com, 8 Oct 2026
Source code
The fully licensed version includes the source code for the kernel, IDE, and features, along with a cross compiler for customizing the kernel. · forth.com, 8 Oct 2026
Support
A new license includes one year of engineer-level email support; support can be renewed annually for $129/year. · forth.com, 8 Oct 2026
What it does
SwiftForth is an interactive Forth development environment for creating native applications on Windows, Linux, and macOS. · forth.com, 8 Oct 2026

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