Fathym offers Free Trial, but Observable does not.
Fathym is designed for Large Enterprises, Medium Business and Small Business.
Observable is designed for Individuals, Medium Business and Small Business.
Pricing for Fathym Starts at $12.50/Month when Billed Yearly whereas for Observable Starts at $9/User/Month.
Some top alternatives to Fathym includes Codeanywhere, AWS Cloud9, Visual Studio IDE, CodeinCloud, CodePen, CodeTogether, Clustered Cloud, iofod, CodeOnline and Serverless Cloud.
Some top alternatives to Observable includes CodePen, Visualr, ibi Analytics Platform, Instadeq, Dashana, Ideata Analytics, Vizician, Zoomdata and Vizydrop.