Best Open Source Intelligence Newsletters in 2026

NewsletterFIT tracks 3 newsletters that cover Open source intelligence as a primary topic, 1 of them with posts in the last 90 days. By publicly shown subscriber count, the largest are The OSINT Insider Newsletter (8K) and CDS’s Substack (2K).

Updated Nov 8, 2026 · sorted by publicly shown subscribers · methodology

  1. 1
    The OSINT Insider Newsletter8K subscribers

    SubstackMonthly or less · last post Aug 11, 2026

    From recent posts: The OSINT Insider Newsletter publishes weekly technical analyses of open-source intelligence tools, legal developments, and career trends for investigators and data professionals. It covers specific topics such as AI in…

    Likely audience: Cybersecurity professionals

  2. 2
    CDS’s Substack2K subscribers

    Substacklast post Apr 1, 2026

    From recent posts: CDS's Substack publishes daily military reports on the Ukraine-Russia conflict, detailing frontline movements, unit dispositions, and specific combat engagements. The publication is a daily digest focused on open-source…

    Likely audience: Military analysts

  3. 3
    MAGA Underground —

    Substacklast post Mar 6, 2026

    Unfiltered America First: Crushing Distractions, Draining the Swamp, and advancing the MAGA Agenda - No Apologies, No Compromise.

    Likely audience: Geopolitical analysts

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