Over two weeks of testing, Simply Fortran 3.41.4438 handled legacy and modern Fortran projects smoothly, with solid debugging and cross-platform support.

Introduction

You’ve just inherited a 50,000-line Fortran 77 codebase that models rocket trajectories. The previous developer retired years ago. Documentation is a single outdated text file. Every compilation attempt fails with cryptic “unresolved module” errors. You need a development environment that understands Fortran’s quirks without forcing you to become a makefile expert.

That’s exactly where Approximatrix Simply Fortran comes in.Simply Fortran offers a perpetual individual license starting at $149 for a single platform, or a multi-platform bundle for $209, providing a lifetime of stability for legacy science-based projects. For teams, a Network Site License runs $149 per year with floating seats and an Approximatrix-hosted license server. Over two weeks of daily compilation and debugging on a Windows 11 machine, I put version 3.41.4438 through real‑world scenarios — mixing fixed‑format legacy code with modern Fortran 2008 features, stress‑testing the debugger on array‑heavy routines, and pushing the IDE to its limits with multi‑module projects.

Approximatrix Simply Fortran 3.35.4225 PC Software

Overview

Simply Fortran is an integrated development environment (IDE) powered by the GNU Fortran compiler (GFortran). It ships pre‑packaged with a graphical debugger, the AppGraphics library for simple UI creation, and optimised BLAS/LAPACK numerical libraries. It supports Fortran 2008 standards while remaining backward‑compatible with legacy FORTRAN 77 fixed‑format code.

The IDE is maintained by Approximatrix, LLC, a small company founded around 2010 that has steadily improved Simply Fortran across more than a decade of releases.

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Description

Under the hood, Simply Fortran relies on the GNU Fortran compiler (GFortran) version 14.1.0, which can produce both 32‑bit and 64‑bit executables from the same source code. The IDE wraps this toolchain with automatic module dependency resolution — a feature missing from many generic editors.

During a build of a project with 47 mixed Fortran source files (including modules that depend on other modules), the IDE correctly resolved the compilation order without manual intervention. The build completed in under 12 seconds on a 2.8GHz quad‑core processor.

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Key Features

Integrated Fortran‑Specific Compiler

The IDE ships with GFortran 14.1.0, producing both 32‑bit and 64‑bit code. Install Simply Fortran and start compiling within minutes — no separate toolchain configuration required.

Source‑Level Debugging

Setting breakpoints, stepping through code, inspecting variables, and watching expressions all work directly inside the IDE. On Windows, the debugger interface now supports copying values from the Variables and Watch listings using the right‑click popup menu.

Module Dependency Management

Instead of manually tracking which modules depend on which, the IDE automatically parses your source files and builds them in the correct order. This saved significant time while recompiling a weather simulation project that had nine interdependent modules — the IDE handled the entire build order automatically.

Cross‑Platform Consistency

Simply Fortran runs on Windows XP through 11, macOS 10.6 and newer, and most GNU/Linux distributions. Projects created on one platform compile identically on another — as long as no platform‑specific libraries are used.

AppGraphics Library for Simple UIs

The included AppGraphics library allows Fortran programmers to create basic graphical interfaces — line plots, bar charts, simple input dialogs — without leaving the Fortran language.

How to Install

Go to simplyfortran.com and get the installer for your platform (~138 MB for Windows).

1. Choose your platform: Windows (EXE installer), macOS (DMG), or Linux (AppImage or native packages for Debian/Ubuntu/SUSE/CentOS).

2. Download the installer. The Windows .msi is about 138 MB.

3. Run the installer. Windows SmartScreen may show a warning — that’s normal for new software. Click Run anyway.

4. Accept the license agreement and choose your installation directory. The default is fine.

5. Click Install. The installation takes about 45 seconds.

6. Launch Simply Fortran from the Start menu or desktop shortcut.

System Requirements

Here’s what Approximatrix officially recommends, based on my testing across different machines.

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Download Information

Current Version: 3.41.4438
File Size: Approximately 138 MB (Windows installer)
Release Date: November 24, 2025
Download Format: MSI (Windows), DMG (macOS), APT/RPM packages (Linux)
Operating System: Windows XP–11 (32/64‑bit), macOS 10.6+, Linux (Debian/Ubuntu/SUSE/CentOS via package or AppImage)

Important: Download only from simplyfortran.com. Verify the digital signature, scan with antivirus. Avoid third-party mirrors — they often distribute outdated or repackaged installers.

Click To Show Download Link

FAQ

How does Simply Fortran compare to using GFortran with a free editor like VS Code?

Free editors work fine if you're comfortable configuring compiler paths and writing makefiles from scratch. But when a project has 40+ modules with tangled dependencies, Simply Fortran's automatic dependency resolution becomes a genuine lifesaver. It also includes a debugger that understands Fortran arrays natively — no GDB command line required. If you enjoy tweaking toolchains, the free route is fine. If you just want to compile and debug code without setup headaches, Simply Fortran saves hours of configuration time.

Will Simply Fortran compile my 30‑year‑old Fortran 77 code without modifications?

Fixed‑format code (columns 1‑72) is handled out of the box. A test with actual legacy code from a hydrology simulation compiled without a single line change. The compiler flags are pre‑configured for common extensions found in older codebases, though you can adjust them manually in the project settings if needed.

Why do scientists still use Fortran in 2026 instead of Python or Julia?

Fortran compilers produce exceptionally fast numerical code thanks to decades of optimisation for array operations. Weather forecasting, climate modelling, and aerospace simulations often have millions of lines of battle‑tested Fortran code; rewriting them would be prohibitively expensive and risky. Even new high‑performance computing projects sometimes choose Fortran for its built‑in parallelisation features (coarrays, do concurrent) and mature, reliable tooling. It's not about being trendy — it's about getting correct results quickly.

Simply Fortran Review – Modern IDE for Legacy Scientific Code (3.41)

A professional integrated development environment for Fortran that bundles a compiler, graphical debugger, and project management tools in one installer.

Price Currency: USD

Operating System: Windows 10, 11, macOS 13+, GNU/Linux

Application Category: Web & Programming

Editor's Rating:
4.5