Truth Goggles is by no means the only annotation tool out there. There is Scrible, MarkUp.io (which says it will be relaunching), and a plethora of tools to help web designers, educators and others markup websites with notes and feedback. There’s also efforts like Hypothes.is, which aims to create a fact-based annotation layer for the web. Earlier this month, it received a grant of just over $750,000 from the Andrew W. Mellon Foundation to “investigate the use of annotation in humanities and social science scholarship over a two year period.”

Schultz said his project is different in that it enables content creators like journalists to embed their own annotations on their work for all to see, and because it’s oriented to creating public annotations that are “about getting people to ask better questions and be more critical.”