On the ArcGIS resources site, the descriptions and most of the functionality sounds pretty much the same. What are the benefits and downsides of using one over the other?

  • they're identical in that I wouldn't use either - I suggest you stick to the JS API unless your requirements dictate otherwise
    – tomfumb
    Jan 16, 2015 at 22:29

1 Answer 1


I was told by ESRI staff that the ArcGIS API for Flex will no longer be in development, but I don't see that anywhere officially yet.

However, Flex uses actionscript and MXML to create and requires the Flash plugin to display.

Silverlight uses C# and other Microsoft languages using Visual Studio I can't remember and requires the Silverlight plugin to deploy.

Both are very heavy lifts client-wise, and I see less and less of them being used in favour of Javascript API and frameworks like Bootstrap or DOJO.

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