Alternating case

What it's really for

It's the «SpongeBob text»: born from a cartoon frame that became a meme, it's used to make clear that what you're writing is a mockery of what someone else just said. Written normally, «sure, that will work great» is a comment; written alternating, it's plainly sarcastic. It exists to carry the tone of voice into text, which is exactly what messages lose.

How it alternates

The count runs on letters, not on characters: spaces, commas and numbers don't skip a turn, so the effect carries on identically from one word to the next instead of restarting each time. It always starts from lowercase, which is the shape the meme is recognized by. Accents included: accented letters count like all the others.

Where not to use it

Alternating text is unreadable for anyone using a screen reader: many engines spell it out letter by letter, as if it were an acronym, and a whole sentence turns into noise. In-app search stops finding it too, because to a phone «hEllO» and «hello» are two different words. So it's fine in a comment or a reply, never in a title, a bio or a message that has to be found again.

Nearby tools

If you simply need to flip the case of a text typed with Caps Lock on, that one is Swap upper/lowercase. To write backwards there is Reverse text and for upside-down letters Upside-down text. If you're after unusual characters for a bio, the collection is in Text with special characters.