Like the option to follow friends (CD5: Social Influence), a free ‘Double EXP Potion’ that will sometimes, at random, appear in the shop (CD 7: Unpredictability) and the option to customise the experience by buying different outfits for Duo (CD4: Ownership).
More good features, that leverage some of the other Motivational Core Drives, have been added through the years. Having a Streak Freeze equipped allows for missing one day without breaking the streak, creating some much-needed breathing space. More recently this option was replaced with one free ‘Streak Repair’ per month for premium members, as well as a ‘ Streak Freeze’ item that can be bought in the in-app shop with Gems. Giving users this option to save the streak can help a little, but having to spend real money also further increases the perceived weight of the Sunk Cost effect.
When Duolingo reviewed the data, they also recognised there was a problem with the streak design being too Black Hat, so they tried different features to reduce the strain.Ī few years ago you could spend a few dollars to restore a broken streak.
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