Duolingo · Product sense · Mid · 45 to 60 minutes

Improve retention for returning learners

Duolingo is a mobile app that helps people learn languages through short, game-like lessons. Answer this product management case and get it graded line by line against a weighted rubric.

retention strategy
user segmentation
prioritization
experimentation
metric design

The situation

You are a PM on Duolingo's growth team. A meaningful share of inactive learners can still be brought back by email or push reminders, especially around moments like upcoming travel, but many of those users do one quick session and disappear again. Internal analysis shows that users returning after a pause are about 20 percent less likely to be retained than brand new learners. Leadership wants a plan for the first week after a lapsed user comes back. You can change lifecycle messaging, the lesson start experience, the home screen, and the end of session experience, but you are not redesigning the full curriculum. The team is split. One camp wants stronger motivational mechanics, like goals, visible progress, and commitment devices. Another worries that too many prompts, side activities, or guilt based nudges will feel manipulative and drain attention at the exact moment habit rebuilding is fragile. Your director asks you to recommend what product direction Duolingo should take for returning learners, and how you would test it.

What to produce

Write a 1 to 2 page product strategy memo.

Your answer must

State the target user segment you are focusing on and why this segment matters now.
Map the main drop off points in the returning user journey, from reminder to first session to the next day.
Propose 2 to 3 product changes for the first week back, and explain how each addresses motivation, friction, or confidence.
Define one primary success metric, two supporting metrics, and at least two guardrail metrics.
Recommend an experiment plan that includes your first test, the audience, and what result would change your mind.

Constraints

Use only existing Duolingo surfaces, email, push, lesson entry, lesson completion, and home screen.
Do not assume changes to the core teaching content, the subscription model, or brand marketing.
Your proposal should be realistic for one quarter with a small cross functional team.
Avoid solutions that depend on guilt, deception, or sending more notifications by default.

Format

Suggested sections: target user, journey diagnosis, product direction, metrics, experiment plan, risks.

How Duolingo actually played it

Starts from a guilt-inducing reminder email and unpacks eight retention mechanics Duolingo uses, including streaks, notifications and loss framing. Shows how small habit levers compound at large scale.

Streaks and reminders work because leaving feels like losing something
Retention tactics need a reason to return, not just a nudge

Built from Duolingo's User Retention: 8 Tactics Tested On 300 Million Users by Growth.Design.