FSNotes is a great minimalist notes app, but also – what is not often mentioned – it is a drop-in replacement for the pioneering Notational Velocity and its frankenstein-successor nvAlt. If you're habituated to the search-or-create command in NV, you'll be immediately comfortable with FSNotes. The developer has a great open-source philosophy and is very active in the project.
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FSNotes 5 for iOS
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