Yes — Playfair is free to download from Google Fonts. Read the licence it ships with before you use it in client work.
Playfair is well suited for general purpose typesetting. Playfair can be interpolated in three dimensions: Width, Weight and Optical Size. The optical size axis is the most extreme of the axes. Along that axis you can seamlessly change the letterforms from the extremely small Agate (5pt) to the extremely big Needlepoint (1200pt).
A1 features 2 websites using Playfair, including Legora and Fraiche. They lean towards 3D, Neutral, and Elegant design styles, and they’re most often built with Framer and Nuxt.