So, pair Refine with d3.js and you've got both. There's no reason I see to require native application for data visualization unless you absolutely need to load enormous amounts of data, but the value in the visualization itself tends to diminish the more datasets you shove in it. d3.js has very powerful visualization tools https://github.com/mbostock/d3/wiki/Gallery. He chose to build is tool in the native Mac platform, which is great, and great to hear the product is really useful for you -- I'm just defending against alternative tech choices. If you wanted to build this in web tech, I think you surely could. I'm not saying it should be built in web tech, but I disagree with the notion that it couldn't be built in web tech.