Fluidapp browser engine is old and doesn't support things like WebRTC, Web Workers, or modern HTML5 specs. NW.js is based on Chromium so it is basically riding

Fluidapp browser engine is old and doesn't support things like WebRTC, Web Workers, or modern HTML5 specs. NW.js is based on Chromium so it is basically riding the state-of-the-art wave... you can even pass chrome-flags during compilation for building experimental features.. It's much more powerful... I'm halfway of building a nw.js FOSS version of fluidapp that acts as wrapper for modern webapps. =)