SteamDetective is a userscript that aims to make background checks on Steam easier and faster. Its primary objective is to make scammers and alts significantly easier to spot.
Current features
View Steam account information:
ID2, ID3, ID64, URL
Account creation date
Trade/community bans
Trade banned
Trade probation
Community banned
Limited account status (<5$ USD spent)
View reputation from:
SteamRep (Archive)
Status
Profile archives
Backpack.tf
Status (Banned, Feature banned, Normal, No account)
Last visited
Premium status
Amount donated
Inventory value/rank/slots/pure
Trust
Profile/backpack/forums/trust/issues links
Mannco.store
Status (Normal, Banned, No account)
Show profile link if account found
Marketplace.tf
Status (Normal, Banned, No account)
STN.Trading
Status (Normal, Banned, No account)
Join date
Trades made
Rank
Skial
Status (Normal, No account, Banned, Unbanned)
Visited servers (type, last username, first and last seen, playtime)