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Top 23 Scala cats-effect Projects
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Kargo
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skunk-crypt takes a smaller, sharper angle: encryption is just another Skunk codec. You keep writing ordinary Skunk queries; you just swap text for crypt.text. Plain values in your application, AES-256-GCM ciphertext in the database, and the key never leaves your process.
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trading
💱 Trading application written in Scala 3 that showcases an Event-Driven Architecture (EDA) and Functional Programming (FP)
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Project mention: Izumi: Dependency Injection as immutable DAG transform | news.ycombinator.com | 2025-12-01
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pfps-shopping-cart
:shopping_cart: The Shopping Cart application developed in the book "Practical FP in Scala: A hands-on approach"
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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pfps-examples
:izakaya_lantern: Standalone examples shown in the book "Practical FP in Scala: A hands-on approach"
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calico
Calico is a UI library for the Typelevel.js ecosystem. It leverages the abstractions provided by Cats Effect and FS2 to provide a fluent DSL for building web applications that are composable, reactive, and safe. If you enjoy working with Cats Effect and FS2 then I hope that you will like Calico as well. (by armanbilge)
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virgil
A purely functional Cassandra client built on top of the Datastax Java Driver supporting a variety of effect systems like ZIO & Cats-Effect supporting both Scala 2 & 3 (by kaizen-solutions)
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neutron
:stars: Purely functional Apache Pulsar client for Scala built on top of Fs2 (by profunktor)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Scala cats-effect discussion
Scala cats-effect related posts
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Scala real world projects
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Udemy vs Rock the JVM for Cats, Cats Effect, and FS2
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Any recommended design pattern resources?
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Argument against mutation in functional programming.
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Need help to understand fs2 library
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typelevel
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Confusion about Tagless Final
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A note from our sponsor - Kargo
akuity.io | 4 Sep 2026
Index
What are some of the best open-source cats-effect projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Monix | 1,928 |
| 2 | skunk | 1,665 |
| 3 | trading | 663 |
| 4 | DIStage | 629 |
| 5 | pfps-shopping-cart | 551 |
| 6 | kmq | 341 |
| 7 | natchez | 340 |
| 8 | Stryker4s | 213 |
| 9 | pfps-examples | 196 |
| 10 | cats-effect-testing | 194 |
| 11 | calico | 138 |
| 12 | mongo4cats | 126 |
| 13 | fs2-es | 80 |
| 14 | sttp-oauth2 | 80 |
| 15 | graalnative4s | 73 |
| 16 | fly4s | 71 |
| 17 | scache | 65 |
| 18 | pencil | 50 |
| 19 | lila-fishnet | 48 |
| 20 | virgil | 41 |
| 21 | batcher | 20 |
| 22 | neutron | 19 |
| 23 | tiny-aria2 | 16 |
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