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Redis client built on top of Cats Effect, Fs2 and the async java client Lettuce.

redis4cats defines two types of API: an effect-based using Cats Effect and a stream-based using Fs2.



  • PubSub API implemented on top of fs2 streams.
  • Streams API experimental API, subject to changes (WIP).
    • High-level API offers read and append using the underlying commands XREAD and XADD respectively.
    • Consumer Groups are yet not implemented.

Other features are not considered at the moment but PRs and suggestions are very welcome.


Add this to your build.sbt for the Effects API (depends on cats-effect):

libraryDependencies += "dev.profunktor" %% "redis4cats-effects" % Version

And this for the Streams API (depends on fs2 and cats-effect):

libraryDependencies += "dev.profunktor" %% "redis4cats-streams" % Version

Note: previous artifacts <= 0.8.0-RC1 were published using the com.github.gvolpe group id (see migration guide).

Log4cats support

redis4cats needs a logger for internal use and provides instances for log4cats. It is the recommended logging library:

libraryDependencies += "dev.profunktor" %% "redis4cats-log4cats" % Version

Running the tests locally

Either change the startContainer boolean in the DockerRedis.scala file or start the redis client manually using docker (recommended):

# single server
docker run -p 6379:6379 redis:5.0.0

# cluster server
docker run -p 30001:30001 -p 30002:30002 -p 30003:30003 -p 30004:30004 -p 30005:30005 -p 30006:30006 m0stwanted/redis-cluster:latest

Code of Conduct

See the Code of Conduct


Licensed under the Apache License, Version 2.0 (the “License”); you may not use this project except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.