ADP
Yes, both SmartDB and Amazon Neptune offer a Free Trial.
SmartDB is designed for Medium Business and Small Business.
Amazon Neptune is designed for Large Enterprises, Medium Business and Small Business.
The starting price of SmartDB begins at $12/Month, while pricing details for Amazon Neptune are unavailable.
Some top alternatives to SmartDB includes SingleStore, DigitalOcean MySQL, YugabyteDB, CloudBoost, cloudbase.io, brainCloud, XServer, Exasol and ScalableSpace.
Some top alternatives to Amazon Neptune includes Hasura, Dgraph, Neo4j Graph Database, Nebula Graph, Oracle Spatial and Graph, IBM Graph, TigerGraph and SmartDB.