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Substack Now Lets You Check if a Post Was Written by AI

The tool lets readers gauge AI involvement while creators can now disclose how much AI they used.

  • On Tuesday, Substack launched an AI detection tool powered by Pangram, allowing readers to scan posts, notes, replies, and comments for AI-generated or AI-assisted text on web and iOS, with Android arriving soon.
  • Substack CEO Chris Best introduced the feature in a post titled 'Against Claudefishing,' his term for content leaning on AI while presenting itself as human, citing a fundamental mismatch between reader expectations and reality.
  • Readers select 'Scan for AI text' from the menu to see Pangram's percentage breakdown of AI-generated, AI-assisted, or human text, while writers can add 'How I make this' statements and scan drafts before publishing on content longer than 100 words published from July 21 onward.
  • Substack acknowledges Pangram cannot detect whether AI was used for research before writing, and The Atlantic found AI detection tools are far from perfect, with experts warning detection is a 'losing battle' as AI can be fine-tuned to evade it.
  • With 40% of some platforms' posts now fully AI-generated, Substack is exploring future AI preferences in Reply Rules and reader-side filtering options, positioning human authorship as potentially scarce and valuable. Business Insider's Peter Kafka noted that if AI wins, 'made by humans could be a very good business.
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mediagazer.com broke the news on Tuesday, July 21, 2026.
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