effect-monad VS free

Compare effect-monad vs free and see what are their differences.


Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects. (by dorchard)
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effect-monad free
0 3
84 142
- -
0.0 5.0
11 months ago 21 days ago
Haskell Haskell
BSD 3-clause "New" or "Revised" License BSD 3-clause "New" or "Revised" License
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 effect-monad. We have used some of these posts to build our list of alternatives and similar projects.

We haven't tracked posts mentioning effect-monad yet.
Tracking mentions began in Dec 2020.


Posts with mentions or reviews of free. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-11-18.
  • Is this meta-authentication system possible in Haskell
    1 project | reddit.com/r/haskell | 10 Apr 2022
    If you want me to go into more detail after you've given it a go, let me know. There are a few free monad libraries out there. I think the best place to start is https://hackage.haskell.org/package/free, because it is the least cushy library, and so you can learn how they work internally etc. Later you might try algebraic effects as a backup.
  • Stack-safety for free?
    3 projects | reddit.com/r/rust | 18 Nov 2021
    That's an awesome tagline! I have a Haskell background and was alluding to "Monads for free" from the free package when picking the title "Stack-safety for free?" Alluding to Rust's "fearless concurrency" seems so much more appropriate though.
  • [ANN] merge, cropty, and trust-chain
    2 projects | reddit.com/r/haskell | 18 Sep 2021
    https://hackage.haskell.org/package/trust-chain is a little more out there, but the most interesting to me personally. There are two ways to think about it, each useful to different audiences. On one hand, it can be seen as a tree where the node structure and leaf type are type level parameters, and every internal node is signed by the private key corresponding to the public key at that node. In Haskell, it can be seen as a free monad where every layer is signed in that same way.

What are some alternatives?

When comparing effect-monad and free you can also consider the following projects:

extensible-effects - Extensible Effects: An Alternative to Monad Transformers

Free Category - Free categories, free arrows and free categories with monadic actions

ReplicateEffects - Composable replication schemes of applicative functors in Haskell

retry - Retry combinators for monadic actions that may fail

lens-tutorial - The missing tutorial module for the lens library

fused-effects - A fast, flexible, fused effect system for Haskell

cond - Basic conditional operators with monadic variants.

eveff - Efficient Haskell effect handlers based on evidence translation.

pipes - Compositional pipelines


rio-orphans - A standard library for Haskell

Free Algebras - Free Algebras in Haskell