Text that looks different
Unicode has many look-alike letters: math bold and script letters, circled letters, full width letters, small caps, and upside-down stand-ins like ɐ and ǝ. They look fancy but are hard to copy into other tools. Zalgo text piles accent marks on top of letters.
Paste any of it and CacheCrack gives you the plain letters, flips upside-down text back, and tells you if it found invisible characters.
Example
ǝɥɔɐɔ ǝɥʇ is the cache.