There are two established Diagramming apps for Confluence Server.
It’s hard to know which is the best, so we’ve summarized and compared the functionality on this site.
Reviews & releases
While Gliffy is the oldest diagramming add-on in the Atlassian environment, has been the highest rated in the Atlassian Marketplace since 2013. Both products are being actively developed and are free to test from the Atlassian marketplace.
Product update frequency
draw.io online is developed as an Agile application, with releases of the online product up to 4 times daily. draw.io for Confluence has longer release cycles for extra stability, but still is the most frequently updated add-on of the three. Gliffy, in contrast, was only updated 7 times in 2016.