Fable review
A self-hosted F# compiler with seven listed output targets and CLI workflows.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Fable is an open-source, self-hosted compiler that translates F# into JavaScript, TypeScript, Python, Rust, Dart, PHP, and Erlang/BEAM. It is aimed at developers and teams who want to write in F# while targeting web, server, or other runtime ecosystems. Its single source language and multiple output targets make it relevant to F# teams working across more than one language environment, rather than developers looking for a general-purpose transpiler.
The breadth of its targets is a defining strength. Fable supports JavaScript interoperability through imports and emitted JavaScript, produces ES2015-compatible JavaScript, and supports F# Core plus selected .NET libraries. Source maps and configurable output directories are available, while Erlang output includes generated rebar3 project scaffolding. The documentation lists seven targets; the CLI documentation lists six language options and omits Beam, so teams evaluating Erlang/BEAM output should check the relevant workflow before adopting it.
Fable provides command-line release, watch, and clean modes, with a selectable compilation language. Its ecosystem includes Webpack, Vite, Parcel, Node.js, npm, and NuGet, which helps connect compilation to JavaScript tooling and package workflows. The project is open source and self-hosted, with documentation and community support channels. Choose Fable if your work is centered on F# and you want to target several languages or integrate F# with JavaScript tooling. It is a less suitable fit if you need multiple source languages or a managed hosted compiler.
Fable pros and cons
- Where it wins
- Compiles F# to JavaScript, TypeScript, Python, Rust, Dart, PHP, and Erlang/BEAM
- CLI supports release, watch, and clean modes with selectable output language
- JavaScript interoperability, source maps, and bundler integrations
- Where it doesn't
- Requires self-hosted deployment
- F# is the only listed source language
- Docs and CLI differ on whether Erlang/BEAM is a target
Fable fact sheet, pricing and score →
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