[seanp2k2]

Think not of a desktop app, but of doing everything client-side in JS. That way, it's still a web app, but you're not schlepping [sensitive|large] data between front and back-ends. Also, by offloading the work onto clients, it scales much better - you could host the app on a CDN and have no real back-end.

[jastr]

I originally wrote it in entirely client side JS, but it didn't scale nicely past a few hundred thousand rows. For the really big datasets, CSV Explorer loads them into Redshift - queries takes a few seconds!