Alternatives to Claude.ai Copernicus font inspired by Plantin

Claude.ai has this nice, friendly heading font (in separate post worth comparing with e.g. openai for the feel of it):

Quick inspection shows this to be Copernicus font font from Labor and Wait: https://www.laborandwait.xyz/fonts/copernicus

💰 Is it open and/or free?

Ans: it's not open. It iss free for personal use but not for commercial use.

Is there a similar alternative that is open?

Can we find a similar open alternative? According to this page

Copernicus Font Family is a modern reinterpretation of the classic Plantin typeface, designed by Chester Jenkins and Kris Sowersby in 2009. This versatile serif typeface features a wide base and thick strokes, making it both sturdy and elegant. Its supple, curvaceous shapes provide a balanced presence that works harmoniously with sans-serif fonts. Ideal for both headlines and body text, Copernicus embodies a calm yet playful aesthetic, suitable for a variety of design applications.

So let's look for open Google Fonts based on Plantin …

And hey presto 🚀 we find Young Serif, which doesn't look too far off from Copernicus: