The whichKey? application allows for the convenient identification of the many keys, (as in: "lock"), a person may be carrying. It allows a photo of the key to be paired with a description of what the key is used for. Additionally four (4) 'tags' may be assigned to the key for use by the filtering option.
When a key is needed for a particular lock the table of keys is simply scanned for the appropriate description and a large photo of the key is displayed. This will allow you to match the photo to the keys on your ring for instant identification of the correct key to use.
Additionally, if you have a key for which the lock is a mystery; you can scan through the large key photos until you find a matching key. Then the description displayed will indicate the correct lock in which the key fits.
If you are one of those lucky few who must carry a whole gaggle of keys then the filtering option will allow you to narrow the search of keys down to a more manageable list.
whichKey? is a simple app to keep on one of those back pages of your iDevice for the frustrating moments when you need access quickly but dread the task of going through each key on your keyring.