Inventory of Unused Keys

Pretty sure neither one has the same functionality.

Groupees let you mark keys as used but it is not automated.

only ET! ;p

I dont know if it will work, but maybe you could try "ctrl+f" (or find on page) and write there "click to reveal" (Text which is written on the reveal button).
I dont have any way to try if it works so you have to try by yourself

Thanks for all the answers and ideas. I appreciate the time taken to do so.