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NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better effectful alternative or higher similarity.
effectful discussion
effectful reviews and mentions
Posts with mentions or reviews of effectful.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2025-01-19.
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Haskell: A Great Procedural Language
Basically StateT uses Either to model either the application state or an error. So if your application throws, you lose the current state forever. They sort of painted themselves into a corner with this choice of type, there's no real way out now.
This explains in more detail:
https://github.com/haskell-effectful/effectful/blob/master/t...
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Effectful – Build Fast and Reliable Haskell Applications
You may get answers by reading https://github.com/haskell-effectful/effectful/?tab=readme-o...
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Haskell in Production: Standard Chartered
Also a much simpler alternative in my opinion to monad transformers is effectful:
https://github.com/haskell-effectful/effectful
Here's a talk on it:
https://www.youtube.com/watch?v=BUoYKBLOOrE
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The "Services" design pattern
effectful got rid of all issues I listed (I expanded a little on it here).
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effectful and polysemy users: How do you test? Any of "same as mtl", "novel ways enabled by effects", or "same but more efficiently because..."? Please share experiences
There is also a long document on Issues with the Transformer/mtl library.
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Haskell ecosystem questions.
cats-effects -> https://github.com/haskell-effectful/effectful
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How to Handle My Horrible Haskell: Global State
I think ReaderT over IO or an algebraic effect system that uses it under the hood like effectful is the way to go. However, you mentioned redux, so perhaps you'd be comfortable with organizing things using TEA (the elm architecture)? You would have actions that different components listen to , and your async stuff could be handled using subscriptions.
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Real world applications with tagless-final, ReaderT, and three-layers
API for basic usage is very similar, but things quickly go south once you want to use higher order effects (i.e. effects that make use of the m type parameter). A lot of things then become very hard to write due to complex types or outright impossible (this issue is a good example - a reasonable thing to do that is very straightforward to write with effectful, apparently impossible to do with polysemy).
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How to Lose Functional Programming at Work
> Lets say you have a huge overly-convoluted Haskell program. Somewhere deep down a call hierachy of pure functions you need to print something to the console. That is not easy to refactor.
> Or vice-versa you have a huge convoluted program where everything happens inside an IO monad because at some point something is written to the console. Now you realize you dont need to write to the console.
These problems are essentially completely resolved these days by a modern effect system like effectful. Basically, they allow you to do arbitrary effects deep down a call stack with minimal plumbing (you still have adjust the types, as you should: that's the point of effect tracking!) and also to remove effects, so you can easily convert between pure code and "effectful code that just so happens to do no effects".
https://github.com/haskell-effectful/effectful
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Published my first Haskell library on Hackage: xdg-basedir-compliant
Also note that Polysemy has some really bad performance characteristics. Don't know how much of a problem it could be at such a small scale, but if you need to use an effect system, maybe something faster like effectful would be a better choice.
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A note from our sponsor - InfluxDB
www.influxdata.com | 18 May 2025
Stats
Basic effectful repo stats
23
419
8.6
18 days ago
haskell-effectful/effectful is an open source project licensed under BSD 3-clause "New" or "Revised" License which is an OSI approved license.
The primary programming language of effectful is Haskell.
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InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com