Branch² Intelligence

Substack’s new tool tells you who’s been writing their newsletters with AI

US · 2026-07-22

Key takeaway

Substack launches an AI-detection tool that estimates how much AI was used to write newsletters, aiming to increase transparency.

  1. Step 1 · The triggerSubstack launches AI-detection tool, revealing AI involvement in newsletters.
  2. Step 2 · Knock-onReaders adjust trust based on AI scores; high-AI newsletters face lower engagement and subscriber churn.
  3. Step 3 · Reaches youWriters reduce AI use to maintain trust, shifting the platform's content quality and competitive dynamics.

The trigger is reported by the source below. The steps that follow are Branch²’s traced reasoning — how the shock could reach a business like yours, not a prediction.

Source: TechCrunch

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