Disqus

Disqus is a hosted commenting and audience engagement platform, positioning itself on community growth alongside comments, with moderation tools, engagement analytics and a games hub added to keep readers returning. It is embedded on a very large number of publisher sites and carries most of the recognition in this category.

The business model is what a site owner should understand before installing it. The free tier is funded by advertising placed in the comment area, which means a publisher choosing it is handing part of its own page to a third party's advertising, and readers see whatever that network serves. Paid tiers remove the advertising, and the choice between them is really a choice about what the comment section is for.

Scale is the genuine advantage. A reader arriving at a site with Disqus is often already registered, which removes the account creation step that stops most people commenting anywhere, and no self hosted alternative can offer that.

Weight is the corresponding cost. The embed loads substantial third party JavaScript and trackers, which is measurable in page performance and is the most common reason publishers migrate away. Every self hosted alternative in this category defines itself against that weight, which is a fair indication of how much it matters.