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Best ChatGPT Plugins Newsletters in 2026

NewsletterFIT tracks 3 newsletters that cover ChatGPT plugins as a primary topic, all with posts in the last 90 days. By publicly shown subscriber count, the largest are #MartesCoach de Oscar Schmitz 🚀 (22K).

Updated Nov 11, 2026 · sorted by publicly shown subscribers · methodology

  1. 1
    #MartesCoach de Oscar Schmitz 🚀22K subscribers

    SubstackSeveral times a week · last post 8 days ago

    Transformando lo imposible en posible (coaching transformacional, ejecutivo, innovación tecnológica y negocios disruptivos)

    Likely audience: Profesionales de operaciones

  2. 2
    iadopters—

    SubstackEvery two weeks · last post 27 days ago

    From recent posts: The article provides a step-by-step guide on migrating custom GPTs to ChatGPT's new plugin system before the December 2026 sunset date, emphasizing the importance of backing up instructions and testing functionality. It…

    Likely audience: AI developers

  3. 3
    ChatGPT4 as a CEO by J.—

    SubstackEvery two weeks · last post 11 days ago

    This is where I document my work - from a journey building ChatGPT4's best company to start with 1,000 USD to Crafted, a company that combines tech and coaching for busy senior leaders looking to grow their thought…

    Likely audience: founders

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