io-sim VS purescript-halogen

Compare io-sim vs purescript-halogen and see what are their differences.


Haskell's IO simulator which closely follows core packages (base, async, stm). (by input-output-hk)


A declarative, type-safe UI library for PureScript. (by purescript-halogen)
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io-sim purescript-halogen
2 11
25 1,487
- 0.5%
8.9 0.0
7 days ago about 2 months ago
Haskell PureScript
Apache License 2.0 Apache License 2.0
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 io-sim. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-11-16.
  • What can I do in Haskell? UwU
    8 projects | /r/haskell | 16 Nov 2022
    It is implemented using our own io-sim library: - which I hope to put on Hackage in future.


Posts with mentions or reviews of purescript-halogen. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-11.
  • Designing an HTML Component system
    3 projects | /r/scala | 11 May 2023
    There's a framework in purescript from which u can grab some ideas I think:
  • What can I do in Haskell? UwU
    8 projects | /r/haskell | 16 Nov 2022
    If you wanna do web frontends right now, I'd recommend Halogen for Purescript since it is maintained and has documentation.
  • Building Mystery Mansion Madness without a UI Framework
    8 projects | | 21 Oct 2022
    Before 2012, all of my websites were made using HTML, CSS and a sprinkling of JS. Then, I went all-in on AngularJS, followed by React. I started using Typescript and then PureScript and learned more frameworks like Halogen and Concur. I even wrote my own UI framework called purescript-deku.
  • Inflist, an experiment using PureScript and React
    8 projects | | 13 May 2022
    First of all I had to choose what to use to manage the User Interface. I narrowed down to two modules: Halogen and react-basic-hooks (which is a “wrapper” of the unmaintained react-basic). I decided to go with react-basic-hooks just because I work with React on a daily basis and I wanted to understand its interoperability with PureScript. I will 10/10 try Halogen too in the next future since as far as I can see is the most famous and maintained in the PureScript community.
  • State of Scala.js frameworks
    14 projects | /r/scala | 5 May 2022
    There's also Purescript, which is sort of a Haskell for frontend. It has type classes, HKTs and so on and also has a very nice FFI. When it comes to UI libraries there is Halogen which I think is very well though out and allows for using tagless final approach. There's also react-basic but I haven't used that one myself.
  • Solid.js feels like what I always wanted React to be
    17 projects | | 28 Feb 2022
    Yeah? I wrote something to deal with it too ( 5.5 years ago. You arguably chose the wrong data as `(model, Cmd msg, Maybe extMsg)` instead of `(model, Cmd msg, List extMsg)` which would give you more flexibility and still functions as a monoid on [] instead of Nothing, but allows multiple messages shrug. I tried this approach more recently and it involved me having to encode all of actions in a massive tree and then I still had issues with certain messages including now having to UUID all elements that that previously I didn't need to think about. It was a mess, but the best I could do with the tools at hand.

    If you compare this to Halogen ( where you still have purity but can set up subscribers and listeners from any component. It's much easier to use and for some components like dialogs, it's much simpler. And this actually isn't the best example because with the latest Halogen, Portals ( was introduced so you can launch a dialog on the spot instead of even needing to communicate between them at all.

  • 7 Useful Tools Written in Haskell
    5 projects | | 18 Oct 2021
    Below you can find the example of a simple button component written in Halogen:
  • Q: Webapps in Purescript for Haskellers
    2 projects | /r/purescript | 26 Feb 2021
  • Haskell as a first timer - Am I missing something ?
    6 projects | /r/haskell | 3 Feb 2021
    Hi just to answer your Purescript question. I've been using Purescript for some time now in production and I really like it. I've been using purescript-halogen which is a reactive framework, similar to React, Vuejs etc. I feel Purescript has a lot of top quality libraries and they have been increasing lately. But just like with Haskell there will be abandoned repositories and undocumented experiments and sometimes it has to do with the fact that both Haskell and Purescript have fewer maintainers than some other languages. But my experience is that a lot of the libraries that are written are well implemented and very usable.

What are some alternatives?

When comparing io-sim and purescript-halogen you can also consider the following projects:

solid-start - SolidStart, the Solid app framework

purescript-flame - Fast & simple framework for building web applications

solid-site - Code that powers the platform.

reagent - A minimalistic ClojureScript interface to React.js

purescript-react-basic - An opinionated set of bindings to the React library, optimizing for the most basic use cases

nixos-config - My NixOS configuration

pandoc - Universal markup converter

solid - A declarative, efficient, and flexible JavaScript library for building user interfaces.

purescript - A strongly-typed language that compiles to JavaScript

package-sets - PureScript packages for Spago and Psc-Package

tilapia - Improving all Haskell's programmer interfaces

tyrian - Elm-inspired Scala UI library.