The best alternatives to headdit are Coment.io, JustComments, and Ahoy!. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of headdit?
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Ahoy allows you to leave comments on any webpage through its virtual comment board. See what web surfers all around the world are reading, and start a conversation! Your web surfing experience will never be the same again.
Rev is designed to be beautiful and easy to use for browsing and participating in Reddit communities every day. Advanced features like UI customization and moderation are also on the to-do list.