Neither Cube.js nor Observable offers a free trial.
Cube.js is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Observable is designed for Individuals, Medium Business and Small Business.
Pricing for Cube.js Starts at $99/Month whereas for Observable Starts at $9/User/Month.
Some top alternatives to Cube.js includes Microsoft Power BI, Dundas BI, Draxlr, Dgraph, GraphJSON, Ideata Analytics, Microsoft Power BI Desktop, Metabase and GraphQL Editor.
Some top alternatives to Observable includes CodePen, Visualr, ibi Analytics Platform, Instadeq, Dashana, Ideata Analytics, Vizician, Zoomdata and Vizydrop.