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.
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.
$23M Series C March 2024 (Fulcrum/Godwin); 3B API requests/day; Edmunds/Klarna/Delivery Hero customers; Retail Media Cloud platform; ad server infrastructure leader
Kevel is an ad infrastructure platform that provides APIs and tools for publishers, marketplaces, and retailers to build and operate their own ad serving and monetization systems. The company serves digital publishers, e-commerce platforms, and app developers who want to control their own advertising technology stack rather than relying on third-party ad networks. Kevel offers customizable ad serving, real-time bidding, reporting, and yield optimization tools that enable businesses to create branded ad experiences, maintain data ownership, and maximize advertising revenue while controlling user experience.
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