In the past, disqus was the solution to go for when you needed a functionality for your static website that would enable people to post comments and ask questions under your posts.
With it's free tier, you would get a package with basic features. It comes with a price though of it being relatively heavy solution.
It's ads supported and increases page weight by factor of 10
! Not to mention it lets other applications like Facebook to track your visitors.
So recently when I was in middle of integration of disqus
plugin to this blog, I decided to revisit my product of choice and explore other options in nowadays product driven market.