Freedom251 › Integrated Development Environments
Fortran Builder
What Fortran Builder is
Fortran Builder is an integrated development environment for creating, editing, compiling, linking, running, and debugging Fortran programs on Linux, macOS, and Windows. It bundles the nAG Fortran compiler, described as supporting Fortran 77 through Fortran 2018 and partial OpenMP 4.0/4.5 support. The Fortran editor provides syntax coloring and code completion, while a button starts project builds and runs. Compiler diagnostics include checks for nonconforming Fortran, uninitialized variables, and argument type errors, grouped by the maker into 32 categories. LAPACK is included; linking the nAG Library requires a separate paid license. The environment supports mixed Fortran and C/C++ development and can build DLLs for other environments, with Excel and Python examples. A Japanese Fortran 90/95 e-book includes runnable examples. Built executables and DLLs can run without Fortran Builder, although nAG Library programs need its license key. A four-week trial is available to eligible company, research-institution, and university affiliates. Academic licenses start at ¥82,500, paid once, billed 税込.
Who it suits
Fortran Builder suits developers, researchers, and organizations building or maintaining Fortran applications across Linux, macOS, and Windows. It also fits mixed-language projects using C/C++, Excel, Python, or nAG libraries.
What it does well
- Supports Fortran 77 through Fortran 2018
- Includes integrated debugging and build tools
- Provides 32 categories of compiler checks
- Supports mixed Fortran and C/C++ projects
- Four-week trial for eligible affiliates
What to know first
- No free plan
- nAG Library needs a separate paid license
- Version 7.1 keys do not work with 7.2
- Support excludes program debugging questions
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Floating license — academic, Fortran Builder 7.2 | 税込; 5-year license, per license · Windows or Linux · concurrent-use licensing | ¥108,900, paid once |
| General, corporate, or government — USB-key (Windows) or node-locked (macOS/Linu | 税込 · Single license · annual maintenance priced separately | ¥166,100, paid once |
| Floating license — general/corporate/government, Fortran Builder 7.2 | 税込; 5-year license, per license · Windows or Linux · concurrent-use licensing | ¥220,000, paid once |
| Academic — USB-key (Windows) or node-locked (macOS/Linux), Fortran Builder 7.2 | 税込; includes first-year maintenance · Academic customers · single license | ¥82,500, paid once |
As nag-j.co.jp lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
Fortran Builder combines a Fortran-focused editor, compiler, diagnostics, build controls, linker, runner, and debugger across three operating systems. It is sold through one-time academic, floating, and general licenses, with a four-week eligible-user trial.
Facts from Fortran Builder's own pages
- Company
- The Japanese maker is Nihon Numerical Algorithms Group K.K., established in 1994 and headquartered in Chuo-ku, Tokyo; its parent NAG is headquartered in Oxford, UK. · nag-j.co.jp, 11 Oct 2026
- Compiler
- It bundles the nAG Fortran compiler, which the maker says supports Fortran 77 through Fortran 2018 and partial OpenMP 4.0/4.5 support. · nag-j.co.jp, 11 Oct 2026
- Diagnostics
- The compiler checks for issues including nonconforming Fortran, uninitialized variables, and argument type errors; the maker describes 32 error-detection categories. · nag-j.co.jp, 11 Oct 2026
- Distribution
- Built executables and DLLs can run on PCs without Fortran Builder and do not require a Fortran Builder license key; programs using nAG Library require its license key. · nag-j.co.jp, 11 Oct 2026
- Editor
- The Fortran-specific editor provides syntax coloring and code completion, with project build and run available from a button. · nag-j.co.jp, 11 Oct 2026
- Integrations
- The product can build DLLs for use from other language environments, with maker examples for Excel and Python, and supports mixed Fortran and C/C++ development. · nag-j.co.jp, 11 Oct 2026
- Learning
- It includes a Japanese Fortran 90/95 programming e-book whose example programs can be run from the product. · nag-j.co.jp, 11 Oct 2026
- Libraries
- LAPACK is included, while linking the nAG Library requires a separate paid license. · nag-j.co.jp, 11 Oct 2026
- Licensing limit
- Version 7.1 and earlier license keys cannot be used with version 7.2. · nag-j.co.jp, 11 Oct 2026
- Platforms
- Version 7.2 supports Windows 10/11, macOS 14 or later on Apple Silicon, and 64-bit x86-64 Linux; Intel Macs are unsupported. · nag-j.co.jp, 11 Oct 2026
- Product
- Fortran Builder is an integrated development environment for creating, editing, compiling, linking, running, and debugging Fortran programs. · nag-j.co.jp, 11 Oct 2026
- Support
- Email support for maintained licenses is available on business days during stated Japanese office hours; user-program debugging and development questions are excluded. · nag-j.co.jp, 11 Oct 2026
- Trial
- A four-week trial is offered to people affiliated with companies, research institutions, or universities; the maker says it usually emails a trial key within one business day. · nag-j.co.jp, 11 Oct 2026
Where Fortran Builder stands on Freedom251
- Integrated Development Environments#51 of 65