Ad spend optimization newsletters

NewsletterFIT tracks 3 newsletters that cover Ad spend optimization as a primary topic, all with posts in the last 90 days. By publicly shown subscriber count, the largest are Voltage Digital - Building Wealth through Amazon FBA (8K), Growth Field Notes (7K) and Marketing measurement and analytics | 021 Newsletter (2K).

Updated Oct 30, 2026 · sorted by publicly shown subscribers · methodology

  1. 1
    Voltage Digital - Building Wealth through Amazon FBA 8K subscribers

    Substack Several times a week · last post 17 days ago

    Likely audience: Amazon FBA sellers

  2. 2
    Growth Field Notes 7K subscribers

    Substack Monthly or less · last post 17 days ago

    Likely audience: Growth Marketers

  3. 3
    Marketing measurement and analytics | 021 Newsletter 2K subscribers

    Substack Monthly or less · last post 56 days ago

    Likely audience: Data analysts

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