Utterances is a lightweight comments service built on GitHub issues. Use GitHub issues for blog comments, wiki pages and more! The project is open source, always free, with no tracking or ads.
Cloudflare Workers power the REST API for Utterances, including GitHub OAuth, issue, and comment creation APIs. Utterances is used on thousands of pages visited by millions of users. Without the inexpensive scalability provided by Cloudflare Workers I would not be able provide Utterances as a free service.