Looks like it’s a CreepyPasta, here’s a Wikipedia article on it.

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I use voyager which I know is available on iOS. There’s a lot of android options as well.

Was using Memmy but switched to voyager recently and liking it a bit more, reminds me of Apollo. It’s still pretty early for all the apps though so I have a few and I check them occasionally to see how they improve.

For real, thought everyone was overhyping them before I got one but it’s honestly crazy how much of a difference it makes and how convenient it is