lwt VS melange

Compare lwt vs melange and see what are their differences.


A mixture of tooling combined to produce JavaScript from OCaml & Reason (by melange-re)
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lwt melange
4 12
602 430
2.0% 7.9%
8.3 9.6
25 days ago 4 days ago
OCaml OCaml
MIT License GNU General Public License v3.0 or later
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of lwt. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-02-13.
  • Ocaml for web development
    8 projects | reddit.com/r/ocaml | 13 Feb 2022
    Here is link number 1 - Previous text "Lwt"
    8 projects | reddit.com/r/ocaml | 13 Feb 2022
    I do only very basic web development but have been generally happy with it. One problem I hit was that mssql only works with one of OCaml's async libraries (Async) whereas multipart forms only works with the other, incompatible, async library (Lwt).
  • From TypeScript to ReScript
    12 projects | news.ycombinator.com | 12 Jan 2022
    I have to admit I don't know much about ReScript and only have very basic exposure to OCAML, here is how you do await in it:


    The `let* in` is a generic syntax for monads, it doesn't need a special one just for promise. This was in fact a debate back when async/await was in consideration for ECMAScript, but special syntax is hip so now we have `async/await` for Promise, `.?` for optionals and `flatMap` for arrays, basically the same thing.

  • Dream – Tidy Web Framework for OCaml and ReasonML
    10 projects | news.ycombinator.com | 9 Apr 2021
    Dream doesn't have much of a system call dependency footprint itself. It's basically just a convention for plugging request -> response functions into a web server. Some of its native dependencies will have to be replaced by Node equivalents. Soon after that, it would be portable to Node.

    There is already work underway to port Dream to Mirage, to run in unikernels: https://github.com/aantron/dream/pull/22

    Lwt, Dream's promise library, is itself getting ported to run on top of libuv: https://github.com/ocsigen/lwt/issues/813

    libuv is, of course, the I/O library that powers Node, so it might be practical to run Dream as a native node module very soon after doing this.

    (As an aside, I'm supposed to work on that libuv project, but instead I've been working on Dream :P)


Posts with mentions or reviews of melange. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-06-15.

What are some alternatives?

When comparing lwt and melange you can also consider the following projects:

rescript-compiler - The compiler for ReScript.

js_of_ocaml - Compiler from OCaml to Javascript.

reason - Simple, fast & type safe code that leverages the JavaScript & OCaml ecosystems

ocaml - The core OCaml system: compilers, runtime system, base libraries

dream - Tidy, feature-complete Web framework

Nim - Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).

vscode-ocaml-platform - Visual Studio Code extension for OCaml

async - Jane Street Capital's asynchronous execution library

haxe - Haxe - The Cross-Platform Toolkit

dune - A composable build system for OCaml.

pydantic - Data parsing and validation using Python type hints

ocurl - OCaml bindings to libcurl