Looking for an Evernote alternative with password lock
I guess SimpleNote meet your requirements.


It does sync to the cloud.
The iOS app is universal
You can lock the app with a passcode
It's plaintext only
There's no SimpleNote desktop app per se, but there's a public API and a lot of great software use it that you can find here.
And there's also a web app
There's no list, but there are tags.
You can share your notes.