Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Depending on which you go for, some have ceramic “NeverReplace” nibs, have nibs that do need replacing eventually.
Source: https://www.wired.com/gallery/best-smart-notebooks-and-smart-pens/