Flash apps?

Don’t mind me asking. But how do you guys at F-Secure built your Mac OS X apps? I’m thinking about F-Secure KEY and younited, because those two are the only apps i’ve got any experience with.
This might seem stupid, I apologies in advance, i’m not a software developer by any means. But are these applications built with Flash? Or something similar? The function run or feels like a flash app. Heavy, outdated, slow and laggy. Considering how smooth other native built apps run…    


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