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PaaS (platform as a service) cloud providers generally limit you to a fixed technology stack. However, OpenShift and Heroku allow third-party extensions, which can be used to support Haskell.

1 OpenShift

GHC version: 8.2.1
Author: Gideon Sireling
Home page:

The builder comes in several flavours, with just the network package or a pre-installed framework:

Framework Builder
network ghc-network
Yesod ghc-yesod
MFlow ghc-mflow
Scotty ghc-scotty
Snap ghc-snap
Happstack ghc-happstack
Spock ghc-spock

2 Heroku

GHC version: 7.10.3
Author: Joe Nelson
Home page:

3 Heroku-Haste

GHC version: 7.4.1
Author: Alberto G. Corona
Home page:

Heroku buildpack for tryhplay, incorporating Haste and HPlayground. Demo at