Strictly speaking, Ars Nova Regular is not native to Google Fonts. However, if you want a better experience with zero legal risk, consider Playfair Display or Cormorant Garamond – they offer nearly identical aesthetics with guaranteed open-source licensing.
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After scanning dozens of repositories, here are the top three platforms where you can get a truly better version of Ars Nova Regular for free. Strictly speaking, Ars Nova Regular is not native