All the developer tools, API's, etc. are different for TIBCO Spotfireand DecisionSite so there is no way to use applications created for DecisionSite in TIBCO Spotfire.
Spotfire's interactive information visualization and analytic solutions give users a remarkable experience for quickly and easily querying data and reporting results for superior business intelligence. From portfolio management and customer retention programs to key processes such as CRM, marketing, research, bioinformatics, yield and asset management and design for manufacturing, enterprises around the world rely on Spotfire's business analytics software to improve operational performance.