When developers closely observe these two variations they perceive that Mean.io has a different objective than Mean.js. The only reason might be that Mean.io is not as elegant as Mean.js. When a developer completely understands Stack, mostly he prefers Mean.js.
These are nothing but a unit of writing that can be used over and over without change. Mean.js uses Yeoman generators whereas Mean.io uses a custom cli tool called ‘mean’.
Mean.io uses gulp whereas Mean.js uses grunt. gulp and grunt both are automation tools.
Mean.js employs modules in the front-end and connects them with Express.js. on the other hand Mean.io uses node package modularity with client and server files located in the modules.
Coming to documentation, Mean.js has a highly sophisticated documentation on comparing with Mean.io. Most of the developers find that documentation of Mean.js is better than Mean.io.
since Mean.io is the original one it has larger community, which is growing very faster whereas Mean.js is not that much big but it is also growing at a good pace.
These frameworks can be deployed with one-click but the only difference is Mean.js works on Digital Ocean and Mean.io works on Google compute engine.