MetaMoJi Note is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is Joplin, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to MetaMoJi Note and many of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to MetaMoJi Note are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Evernote (Freemium).
NixNote, formerly Nevernote, is an open source client for Evernote . It is written in Java so it will also run on Windows & OS-X, but the primary focus has been to try and get a usable environment for Linux.
Write is a word processor for handwriting, designed primarily for tablets with an active stylus. Write has the functionality of a vector drawing application, plus a unique set of tools which ease the editing of handwritten text.