typelevel/kittens

Automatic type class derivation for Cats

Stars: 545
Forks: 66
Open beginner issues: 0
Indexed issues: 7
Avg merge: 26m
Merged PRs (30d): 2

Dominant language: Scala
License: Apache-2.0
Last GitHub push: Sep 3, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

7 open issues indexed

Scala 3 regression: derivation error for value classes Open

Blocked/needs help Bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

typelevel/kittens#658 · 3 comments · 1 reaction · Opened Mar 22, 2024
[Scala 3] Derive ConsK Open

Feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

typelevel/kittens#489 · Opened May 31, 2022
[Scala 3] Sequence support Open

Feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

typelevel/kittens#482 · Opened May 27, 2022
[Scala 3] Extra instances for `Covariant`, `Invariant` Open

Feature

Difficulty 4/5 3-5 days Newbie friendliness 30/100

typelevel/kittens#479 · 1 comment · Opened May 26, 2022
[Scala 3] derived instances are not stack-safe Open

Feature

Difficulty 4/5 3-5 days Newbie friendliness 35/100

typelevel/kittens#476 · Opened May 24, 2022
[Scala 3] Derivation for deeply nested types Open

Blocked/needs help Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

typelevel/kittens#473 · 2 comments · Opened May 23, 2022
Create microsite Open

Documentation Needs help

Difficulty 5/5 Over a week Newbie friendliness 10/100

typelevel/kittens#236 · Opened May 13, 2020

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