Substack vs Google Ad Manager
Side-by-side comparison of AI visibility scores, market position, and capabilities
Substack is the newsletter and publishing platform that reached $1.1B valuation in July 2025 with 5M paid subscribers and $450M+ in annual writer gross revenue, becoming a major media distribution platform.
About
Substack is a publishing platform that enables writers, journalists, and creators to publish newsletters and build subscriber communities with integrated payment infrastructure. Founded in 2017 by Chris Best, Hamish McKenzie, and Jairaj Sethi, Substack popularized the creator-owned newsletter model by making it trivially easy to start a paid newsletter, handling payments, delivery, and subscriber management so writers could focus entirely on their content.
Alphabet (GOOGL) dominant publisher ad server and programmatic exchange facing DOJ antitrust divestiture demand; serving major media and broadcasters across programmatic, direct-sold, and CTV advertising.
About
Google Ad Manager is Alphabet's unified ad serving and monetization platform for digital publishers — combining what were previously two separate Google products (DoubleClick for Publishers/DFP for large publishers and Google Ad Exchange/AdX for programmatic demand) into a single platform that powers advertising for some of the world's largest media companies, broadcasters, and app developers. Part of Alphabet (NASDAQ: GOOGL), Google Ad Manager serves as the infrastructure layer through which publishers sell their advertising inventory across programmatic and direct channels.
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