Fortran Builder
Fortran Builder: A Fortran-focused desktop IDE with compiler, debugger, and mixed C/C++ support. Ranked #63 of 65 in Integrated Development Environments by our editors (3.0/10); pricing: 28-day trial; best for fortran developers needing mixed-language tooling.
At a glance
- Editor score3.0 / 10
- Pricing28-day trial
- Best forFortran developers needing mixed-language tooling
- Free planNo
- Facts checked23 Sep 2026
Where it wins
- Compiles, links, runs, and debugs Fortran programs in one environment
- Supports mixed Fortran and C/C++ development
- Includes the nAG Fortran compiler and optional nAG Library integration
Where it doesn't
- Paid-only, with one-time license pricing rather than a free plan
- A 4-week trial may not be available to personal-use applicants
- Focused on Fortran workflows rather than broad, general-purpose development
Our verdict on Fortran Builder
Fortran Builder brings project editing, compilation, linking, execution, and debugging into a desktop environment for Fortran developers. It includes the nAG Fortran compiler, which can also be used from the command line, and supports Windows, macOS, and Linux. The feature set also reaches into mixed-language work: developers can combine Fortran with C/C++, create DLLs from Fortran subroutines and functions, and link LAPACK routines. That makes it relevant to teams maintaining Fortran applications alongside C or C++ code, as well as developers who want a dedicated Fortran workflow rather than a general-purpose IDE.
Its strongest fit is the focused build-and-debug loop. Syntax highlighting and autocomplete support editing, while compiler diagnostics check for common code errors. Project creation and management sit alongside compiling and linking, and the debugger supports running Fortran programs within the same environment. For scientific or numerical workflows, LAPACK linking and optional nAG Library routines extend the tool beyond basic source editing. This combination favors developers who need to work directly with established Fortran code and libraries; buyers looking for a broad multi-language IDE or verified integrated testing should compare alternatives.
The published license options distinguish academic use from general, corporate, and government use, with USB key or node-locked licensing. The academic license includes the initial year of maintenance. According to the vendor's pricing information, prices are one-time amounts in Japanese yen rather than recurring per-user subscriptions, and the product has no free plan. A 4-week trial is offered to eligible organizations and institutional students, though personal-use and free-email applications may not qualify. Vendor support includes email and documentation, with Japanese-language help and learning material. Choose Fortran Builder if its compiler, debugging, and mixed-language capabilities match a Fortran-centered workflow; skip it if a free IDE or recurring subscription is a requirement.
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Fortran Builder pricing
All 2 Fortran Builder plans and prices →
Fortran Builder fact sheet
| Free plan | No |
|---|---|
| Paid from | Not verified |
| Supported operating systems | Not verified |
| Integrated debugger | Yes |
| Integrated testing tools | Not verified |
| Build tools | Yes |
| Project management | Not verified |
| Dev container support | Not verified |
| Free trial | 28 days |
| Deployment | Desktop |
| Platforms | Windows, macOS, Linux |
| Support | Email, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 3 integrations: LAPACK, nAG Library, C/C++ |
| Pricing | 28-day trial (source) |
| Website | nag-j.co.jp |
| Facts checked | 23 Sep 2026 |
Fortran Builder integrations
Fortran Builder lists 3 integrations on its own site.
- LAPACK
- nAG Library
- C/C++
Alternatives to Fortran Builder
- IntelliJ IDEAA full-featured, cross-platform IDE for Java and Kotlin teams.9.4
- Visual StudioA full-featured Windows IDE for .NET and C++ teams with broad tooling.9.3
- PyCharmA full-featured Python IDE with strong testing, debugging, data, and remote workflows.9.2
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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