Substack launches a tool that flags newsletters written with AI

9:23 AM · July 22, 2026

Substack launched a new tool that flags when a newsletter on the platform appears to have been substantially written using AI rather than by its credited human author, according to TechCrunch. The tool gives readers visibility into how much of a given newsletter post was likely AI generated, addressing a version of the same authenticity concern that has already prompted platforms like YouTube and Deezer to introduce their own AI content labeling and detection systems this year, as AI written and AI generated content becomes both more prevalent and harder to distinguish from human made work by casual inspection alone. For a platform like Substack, whose business model depends heavily on readers trusting that a subscription buys them a specific writer's actual voice and judgment rather than a generic AI generated approximation of it, the tool addresses a direct threat to the platform's core value proposition rather than only a broader industry wide content authenticity concern. The move also reflects a wider shift already visible on other platforms this year, in which authenticity and provenance labeling for written and creative content is moving from a niche feature toward a more standard, expected part of how platforms hosting user generated content operate, as the sheer volume of AI assisted or AI generated content continues to grow across nearly every category of online media.