Best Free Website Builder for a Blog
Direct answer: For a dedicated blog, Blogger and WordPress.com are the two strongest free options: Blogger has the lowest long-term cost and simplest setup, while WordPress.com offers more design flexibility and an easier upgrade path if you plan to grow.
Blogger: The Low-Cost, No-Frills Option
Blogger, one of the oldest platforms on the web, has no forced ads, supports a custom domain mapping at low cost, and includes full RSS, categories (labels), and comments out of the box.
WordPress.com: The Growth-Ready Option
WordPress.com's free tier includes a real blogging engine with more design themes than Blogger, though a WordPress.com-branded subdomain and some feature limits remain until you upgrade.
Why Google Sites and Wix Are Weaker Choices for Blogging
Google Sites has no blogging engine at all. Wix's blog app is capable but is layered on top of a heavier, slower-loading site builder framework compared to dedicated blogging platforms.