Instead of Fantomas
Fantomas alternatives
Fantomas is a free, open-source formatter for F# source code, available on Linux, macOS, Windows, and the web. Its defaults follow Microsoft’s F# style guide, with settings for G-Research conventions. It runs as a .NET tool, and local installation lets a repository use a fixed version. Setup guidance covers JetBrains Rider, Visual Studio Code, and Visual Studio. The command-line checker reports formatting drift for CI, while a limited set of options can be read from `.editorconfig`. Fantomas also offers a library API, Apache 2.0 licensing, and an online tool for trying formatting settings.
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Accessibility Test Framework for Android
Free plan AndroidLinuxMac+1Automated accessibility checks in Android app tests — It checks Android accessibility objects instead of formatting F# source code.
Free plan Visit site - 2
Black
Free plan LinuxMacSelf-hosted+1Opinionated Python formatting with editor and CI support — It formats Python with PEP 8 conventions and an 88-character default line length.
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Fourmolu
Free plan LinuxWebWindowsConfigurable Haskell formatting — It formats Haskell and exposes controls for indentation, imports, records, comments, Unicode, and operators.
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goimports
Free plan LinuxMacWeb+1Go formatting with automatic import updates — It formats Go while adding missing imports and removing unreferenced ones.
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Ormolu
Free plan LinuxMacWeb+1Consistent Haskell formatting with minimal diffs — It applies one non-configurable Haskell style using GHC’s parser and targets minimal diffs.
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Prettier
Free plan Open source APIExtensionLinux+4Multi-language web and markup formatting — It formats many web-focused languages and supports plugins for additional languages.
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Ruff
Free plan LinuxMacSelf-hosted+2Python formatting combined with linting and fixes — It combines a Black-compatible Python formatter with more than 900 linting rules and automatic fixes.
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Avidemux
Free plan Open source LinuxMacWeb+1 - 9
Biome
Free plan ExtensionLinuxMac+2 - 10
CSharpier
Free plan APILinuxMac+1 - 11
dprint
Free plan ExtensionLinuxMac+2 - 12
autopep8
Free plan APILinuxMac+1 - 13
elm-format
Free plan LinuxMacWindows - 14
clang-format
Free plan ExtensionLinuxMac+1 - 15
gofmt
Free plan LinuxMacWindows - 16
pgFormatter
Free plan APILinuxSelf-hosted+1 - 17
Scalafmt
Free plan LinuxMacSelf-hosted+1 - 18
shfmt
Free plan LinuxMacSelf-hosted+1 - 19
Laravel Pint
Free plan MacSelf-hosted - 20
rustfmt
Free plan LinuxMacWindows - 21
Taplo
Free plan APIExtensionLinux+2 - 22
Uncrustify
Free plan LinuxMacSelf-hosted+1 - 23
js-beautify
Free plan Web - 24
OCamlFormat
Free plan Linux - 25
PHP CS Fixer
Free plan LinuxSelf-hosted
Readers may switch when they maintain Python, Haskell, Go, web, or Android projects instead of F# code. Fantomas expects source files that parse with the F# compiler and focuses on specific F# extensions. Compare language coverage first, then weigh configuration depth, installation method, editor and CI integrations, browser access, and whether you need import management, linting, accessibility checks, or broader plugin support. The alternatives below differ mainly by language and workflow rather than serving as direct F# replacements.