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AI reading partner that observes how you read, then opens a conversation with an observation, an insight, and one question. Marginalia is an AI reading companion. It observes how the user reads the current page (dwell time, scroll speed, engagement) and, on request, opens a sidebar conversation that returns an observation, an insight, and one question about what they were reading — using the user's own Anthropic API key.
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Listing exposes a developer website URL.
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Listing exposes a contact email.
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Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
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Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
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