We have a team consisting of CEO, Product Manager/UX guy, UI Designer and Front-end developer who all discuss design, UX and usability questions for our app at www.enthuse.me
We all agree that the homepage can be different to the app as long as the 'feeling' of the brand is still there.
Two (2) of us think that the below designs are close enough that there should be no confusion that the app and homepage are part of the same brand/product.
Two (2) of us think that the designs are too different (specifically because of textured backgrounds, more skeuomorphic elements on homepage than on flat design app, and more use of colour on the homepage) and that this might cause confusion.
What do you think? Is there enough of a difference between the two to 'matter' - does a difference in this case matter at all? How could the designs be brought more into line to work 'better' together?