https://www.steamprices.com/
Login with Steam, go to your account -> Owned Games/DLC, then "Missing DLC". Manually import your owned DLC list (instructions are on that page).
Closest thing I have found so far. Does not take DLC into account that are not directly purchasable through Steam (e.g. exclusive DLC that can only be activated via retail key). For those, you'd have to use SteamDB with their userscript on an individual basis.
//edit: I just went through my own missing DLCs on SteamPrices. Some DLCs have wrong information, e.g. "Among the Sleep - Prologue", "Bioshock Infinite - Columbia's Finest" or "Crazy Machines 2 - Back to the Shop". If you have a license for those, you do indeed have access to the DLC, but it is listed as "not owned" on the store page. You'll have to blacklist those items manually on SteamPrices.
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Try http://steamhunters.com/dlc?games=owned&sort=id you'll need to sign in through steam
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I need an help.
I would like to put every dlc (for games that I have) that I missed in my wishlist.
The problem is that I have lot of games and I don't have enough time to click on every game in my library and then check if I have every dlcs.
My question is: is there a method to show non purchased steam dlcs in the steam store?
P.S. I know that if I go there I can click on "dlcs" but it shows every dlc in the steam store
Thanks for the help
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