[augustl]

It's free now - but I suppose 10+ years of being both closed source and paid didn't do wonders for adoption.

What part needs a cluster in your experience? The Datomic deployments I've been involved with have been running on a single server, with a single instance of backing storage etc.

Datalog is interesting indeed... Back when I first started using Datomic in 2012 I had just fundamentally decided to use it, and it took probably a week before the query language "clicked", i.e. to be able to actually compose my own queries and not just copy paste my way to something that works.

[kragen]

to clarify, it's not free as in 'free software'; it's free as in 'free beer'

[OJFord]

In reply to 'its pricing killed it for me', that was not ambiguous.