appendmap VS co-log

Compare appendmap vs co-log and see what are their differences.


A Data.Map wrapper with a Monoid instance that delegates to the individual keys (by koterpillar)


📓 Flexible and configurable modern #Haskell logging framework (by co-log)
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appendmap co-log
0 3
2 248
- -0.8%
0.0 0.0
almost 3 years ago about 1 month ago
Haskell Haskell
BSD 3-clause "New" or "Revised" License Mozilla Public License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of appendmap. We have used some of these posts to build our list of alternatives and similar projects.

We haven't tracked posts mentioning appendmap yet.
Tracking mentions began in Dec 2020.


Posts with mentions or reviews of co-log. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-01-06.
  • Good Haskell Source Code
    5 projects | /r/haskell | 6 Jan 2022
    Another great Kowainik project to suggest is co-log:
  • How to create `co-log` instance for Scotty?
    2 projects | /r/haskell | 6 Jan 2021
    That being said, the fact that you're trying to define an instance of HasLog for ActionT in the first place is a bit suspect, since this co-log tutorial suggests you shouldn't need to do anything of the sort. I think you should be able to perform logging in your App and then lift the App to ActionT by using ActionT's MonadTrans instance. That is, something like this:

What are some alternatives?

When comparing appendmap and co-log you can also consider the following projects:

tslogger - thread-safe logging

logging-facade-journald - Journald backend for logging-facade


rollbar - error notification to

co-log-polysemy-formatting - A Haskell library: A fancy logging effect for Polysemy using the formatting library to format log messages.

logging-facade - An experimental logging API for Haskell, inspired by slf4j

rotating-log - Size-limited, concurrent, automatically-rotating log writer for Haskell production applications

katip-kafka - Kafka backend for Katip



yet-another-logger - Haskell logging framework with a focus on flexibility and performance

greg-client - A very fast lightweight distributed logger with a high-precision global time axis