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Afterglyph

Retention cohorts, explained simply

October 5, 2026 1 min read

A cohort is a group of users who signed up in the same week. Retention shows how many of them are still active later. If week-4 retention climbs after a release, the release helped.

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The Afterglyph studio

Designers, engineers and creative technologists writing about the craft of building for the web.

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