Get Datomic Now!
There are two ways to try Datomic right away.
Register at my.datomic.com and get the no-cost Datomic Pro Starter Edition
Once you have an account, you can also
Or you can download the Free Edition and use it for both testing and production.
To use the full facilities of Datomic Pro, you must purchase a license.
You can read about the different editions here.