Cats-effect Alternatives

cats-effect reviews and mentions

• Looking at A Monad Through An Example
  1 project | dev.to | 24 May 2024

  Sidebar\ As we discover later on, we can use other data types like Try from the standard Scala library or IO from a 3rd party library Cats Effect. As mentioned before, an effect is a container with capabilities: -

• A question about Http4s new major version
  3 projects | /r/scala | 25 Apr 2023

  Those benchmarks are using a snapshot version of cats-effect. I don't know where that one comes from, but previously they were using a snapshot from https://github.com/typelevel/cats-effect/pull/3332 which had some issues (3.5-6581dc4, 70% performance degradation), which have since been resolved (see that PR for more info and comparative benchmarks).

• The Great Concurrency Smackdown: ZIO versus JDK by John A. De Goes
  3 projects | /r/scala | 18 Feb 2023

  Recently, CE3 has had similar issues reported across multiple repositories, almost an epidemic of reports!

• 40x Faster! We rewrote our project with Rust!
  5 projects | /r/rust | 30 Jan 2023

  The one advantage Rust has over Scala is that it detects data races at compile time, and that's a big time saver if you use low level thread synchronization. However, if you write pure FP code with ZIO or Cats Effect that's basically a non-issue anyway.

• Sequential application of a constructor?
  2 projects | /r/scala | 21 Jan 2023

  See also cats-effect and fs2. cats-effect gives you your IO Monad (and IOApp to run it with on supported platforms). fs2 is the ecosystem’s streaming library, which is much more pervasive in functional Scala than in Haskell. For example, http4s and Doobie are both based on fs2.

• Should I Move From PHP to Node/Express?
  13 projects | /r/node | 13 Oct 2022

  On the contrary, switching to the functional mindset, with something like Typelevel Scala3 and respective cats and cats-effect fs2 frameworks, helps to rethink a lot of designs and development approaches.

• Next Steps for Rust in the Kernel
  8 projects | news.ycombinator.com | 21 Sep 2022

  I think "better Haskell on JVM" (in contrast to "worse Haskell") is a good identity for Scala to have. (Please note that this is an intentional hyperbole.)

  Of course, there are areas where Haskell is stronger than Scala (hint: modularity, crucial for good Software Engineering, is not one of them). And Scala has its own way of doing things, so just imitating Haskell won't work well.

  Examples of this "better Haskell" are https://typelevel.org/cats-effect/ and https://zio.dev/ .

  All together, Scala may be a better choice for you if you want to do Pure Functional Programming. And is definitely less risky (runs on JVM, Java libraries interop, IntelliJ, easy debugging, etc...).

  None of the other languages you mentioned are viable in this sense (if also you want a powerful type system, which rules out Clojure).

  I agree that Rust's identity is pretty clear: a modern language for use cases where only C or C++ could have been used before.

• Java 19 Is Out
  4 projects | news.ycombinator.com | 20 Sep 2022

  I would use Scala. I like FP and Scala comes with some awesome libraries for concurrent/async programming like Cats Effect or ZIO. Good choice for creating modern style micro-services to be run in the cloud (or even macro-services, Scala has a powerful module system, so it's made to handle large codebases).

  https://typelevel.org/cats-effect/

  https://zio.dev/

  The language, the community and customs are great. You don't have to worry about nulls, things are immutable by default, domain modelling with ADTs and patter matching is pure joy.

  The tooling available is from good to great and Scala is big enough that there are good libraries for typical if not vast majority of stuff and Java libs as a reliable fallback.

• Typelevel Native
  1 project | /r/scala | 20 Sep 2022

  What took my interest is this (for both JVM and future multithreaded Scala native): https://github.com/typelevel/cats-effect/discussions/3070 Having the same threads poll available IO events and execute callbacks should improve performance greatly

• Scala isn't fun anymore
  10 projects | /r/programming | 10 Sep 2022

  The author is the creator of Monix and implemented the first version of cats-effect. He knows what he is doing.

• A note from our sponsor - Nutrient
  nutrient.io | 15 Mar 2025

  Bad PDFs = bad UX. Slow load times, broken annotations, clunky UX frustrates users. Nutrient’s PDF SDKs gives seamless document experiences, fast rendering, annotations, real-time collaboration, 100+ features. Used by 10K+ devs, serving ~half a billion users worldwide. Explore the SDK for free. Learn more →