Yes — Karla is free to download from Google Fonts. Read the licence it ships with before you use it in client work.
Karla is a typeface used on 2 of the websites in the A1 gallery.
A1 features 2 websites using Karla, including Rare Assembly and Moss. They lean towards Display font, Typographic, and Hand-drawn design styles, and they’re most often built with Shopify and Next.js.