Is this anything like Patina?
I can't speak specifically to Patina, but what we found with other car sites - and the reason we created RideCache - is that most are either covered with ads, are focused primarily on social and sharing or are trying to create a marketplace to buy/sell cars. We felt there was a need for a professionally developed software tool that was focused on helping individuals organize, manage and preserve all of the work and information in and around their cars.
One of the best ways to see the difference is to look at what you see when you log in on most other car sites - what you usually see is other peoples cars. On RideCache - you see your own cars. You can share some things if you choose (and with very fine grain privacy control), but that is not the focus - and there are no "likes" and no comments. Over a third of our customers choose not to share anything - all of their cars, projects, parts and papers are kept fully private. RideCache is simply the tool they use to organize everything about their vehicles.
You can think of RideCache as the tool that allows you to manage all of your to-do and wish lists and capture all the detail behind your car projects or build threads - including details you may not want to share with others. You may choose to share some of that detail to other social oriented sites, but all the detail is always preserved on RideCache.
I hope that helps. We would love to have you try RideCache.
Gary