There's a few people asking about how to get something up quickly to play with - this was a problem for me, and it isn't really well explained, but for those interested, Alexander Kiel's datomic free docker image has worked well for me - https://hub.docker.com/r/akiel/datomic-free/ - and an example of it being used with docker compose is here: https://github.com/dazld/urlomic/blob/cc3d1218218b5f08751dfa... (on a wip branch for some playground thing). I'm far from a pro, but hope this helps someone interested in this tech.