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Start for freeD1 Retention, in the context of growth hacking, refers to the percentage of users who return to use a product or service on the day immediately following their first use. It's a crucial metric for measuring initial user engagement and the immediate value proposition of a product.
Synonyms: Day 1 Retention, Next Day Retention, Initial Retention, First Day Return Rate

D1 Retention is a critical metric in growth hacking because it provides immediate feedback on a product's ability to engage users. A high D1 Retention rate indicates that users found enough value in their first experience to return quickly, which is essential for sustainable growth.
To measure D1 Retention, track the number of users who return on day 1 after their initial use, divided by the total number of new users. Improving D1 Retention often involves: