This doesn't seem very useful to me. It looks like it only estimates taxes for you and doesn't do any legwork on cost of living.
Right now it only provides some very basic cost of living, and things like RRSP contributions. I can probably enhance it by adding the COL data per region, but I would have to focus on a small selection of cities otherwise it would be too much work.
Just focus on Ontario and BC, these will be sufficient for most tech immigrants.