Fable
Fable: A self-hosted F# compiler with seven listed output targets and CLI workflows. Ranked #10 of 28 in Code Transpilers by our editors (8.1/10); pricing: Open source; best for F# teams targeting several languages.
At a glance
- Editor score8.1 / 10
- PricingOpen source
- Best forF# teams targeting several languages
- Paid fromFree
- Conversion modeSource-to-source
- Facts checked22 Sep 2026
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
Our verdict on Fable
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.
Your product? Our editors can test Fable in depth and publish a review, labelled as paid · from $149/mo →
Fable pricing
Fable fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Source languages | 1 languages |
| Target languages | 7 languages |
| Syntax-version conversion | Not verified |
| Intermediate output | Not verified |
| CLI access | Yes |
| API access | Not verified |
| Conversion mode | Source-to-source |
| Deployment | Self-hosted |
| Support | Docs, Community |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Integrations | 6 integrations: Webpack, Vite, Parcel, Node.js, npm, NuGet |
| Pricing | Open source |
| Website | fable.io |
| Facts checked | 22 Sep 2026 |
Fable integrations
Fable lists 6 integrations on its own site.
- Webpack
- Vite
- Parcel
- Node.js
- npm
- NuGet
Alternatives to Fable
- BabelFlexible ECMAScript transforms with CLI, Node.js APIs, and browser compilation.9.3
- SWCAn open-source compiler with minification and bundling for JavaScript and TypeScript workflows.9.2
- Kotlin/JSA free Kotlin-to-JavaScript toolchain for browser and Node.js projects.8.8
Used Fable? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Fable for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Fable is listed in our Code Transpilers directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/fable-code-transpiler/"><img src="https://www.itechguides.com/best/badge/fable-code-transpiler.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update