When comparing Growler vs Apiary, the Slant community recommends Apiary for most people. In the question“What are the best Haskell web frameworks for building RESTful web services?” Apiary is ranked 11th while Growler is ranked 13th. The most important reason people chose Apiary is:
Apiary generates comprehensive HTML documentation based on your API routes.
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Pros
Pro Clean, simple route building
Growler improves on Scotty's route building functions, allowing hierarchical declarations rather than requiring each endpoint to be fully specified.
Pro Automatically generates API documentation
Apiary generates comprehensive HTML documentation based on your API routes.
Pro Type-level routes
Apiary provides type modeling, down to URL parameters, ensuring type safety.
Cons
Con Potentially unstable API
Growler is still at an experimental stage and users are warned that breaking changes may happen between versions.
Con Mediocre documentation
Users must rely primarily on the example project and auto-generated API documentation (Haddocks). The author of Apiary is not a native English speaker and openly acknowledges this issue.