js_of_ocaml vs SourceMeld
js_of_ocaml
ocsigen.orgSourceMeld
sourcemeld.comSide by side
| Figure | js_of_ocaml | SourceMeld |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 1 | 2 |
| Spec score · Code Transpilers | 8.4 (#5) | 8.1 (#7) |
| License | The repository lists GPL-2.0-or-later and LGPL-2.1-or-later with the OCaml linking exception as its licenses. | The core uses a source-available license that the company says is not OSI-approved and restricts competing products. |
| Purpose | js_of_ocaml compiles OCaml bytecode programs to JavaScript for use in browsers and Node.js. | SourceMeld integrates, migrates, and searches code across multiple programming languages. |
| Requirements | The documented compiler requirements include OCaml 4.13 to 5.5, Dune 3.20 or later, and Menhir. | The installation guide lists 4GB RAM minimum, 8GB recommended, and 10GB disk space. |
| Support | The project asks users to report problems or questions through GitHub issues and include version details and a minimal reproducible example when possible. | Community Edition includes community support, while Enterprise Edition includes dedicated support. |
Plans
In their own words
js_of_ocaml
js_of_ocaml compiles OCaml bytecode programs into JavaScript for browsers and Node.js. It works with an existing OCaml installation and does not require libraries to be recompiled. Installation is available through opam, while Dune supports separate compilation in development and whole-program compilation in release builds. Whole-program compilation performs global dead-code elimination and cross-module optimization. The library provides a typed bridge between OCaml and JavaScript, including PPX syntax for properties, methods, constructors and objects. Browser bindings cover the DOM, Fetch, WebSockets, WebGL, workers and typed arrays. Optional packages add Lwt support, TyXML, JSON derivation and an OCaml toplevel in the browser. Documented targets include Node.js 18 or later, QuickJS-NG and modern ECMAScript 2020 browsers, including Chrome 80+, Firefox 74+, Safari 13.4+ and Edge 80+. Requirements include OCaml 4.13–5.5, Dune 3.20 or later and Menhir. The project is free and open source.
SourceMeld
SourceMeld has no write-up on Specifiction yet; its figures are above.