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Just the normal iOS notes app.

For checklists, iOS Reminders app is great,

But you can’t share it with people running Android.

Microsoft Todo, formerly Wunderlist, may or may not have an iOS app. It's pretty good.

Todoist exists but both require a more complicated setup.

It’s been established the main point of the posted app is having shared lists with no install or account creation required, just share a link.

Tasks or Markor are what I use and both are great, and you can syn both pretty easily on different platforms.

Not op, but ColorNote is good.

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