Glossary term Retention
Commitment Device
A voluntary arrangement that binds your future self, chosen now because you expect to be tempted later. Locking savings away, or letting an app forfeit your money if you skip the gym, are commitment devices.
Where you see this in practice
The mechanics that lean on it
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Streak / Streak Bonus
A counter that increments each time a user completes a defined action within a set time window, typically once per day.
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Challenges
Structured, completable objectives with a visible endpoint that users opt into, typically with social or competitive dimensions.