Duolingo · Product sense · Entry · 45 to 60 minutes

How should Duolingo re-engage returning learners?

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

product sense
retention thinking
prioritization
ux judgment
experimentation

The situation

You are a PM on Duolingo's core learning experience. Many learners start strong, then skip the app for a few days, and when they return they often leave again before rebuilding a habit. The Head of Growth wants a focused proposal for improving retention among these returning users, especially in the first session after a short break. Why now, the team is planning the next quarter and can fund one meaningful change to the comeback experience. The hard part is that the problem spans several moments, getting the user back into the app, helping them choose what to do next, keeping them motivated during a lesson, and making the end of a lesson feel rewarding without becoming distracting. You cannot redesign everything at once. You need to decide where the biggest friction is, what product change Duolingo should ship first, and how to test whether it increases repeat usage while still feeling helpful and learning focused.

What to produce

Write a 1 page product memo, 500 to 700 words.

Your answer must

Define the target user segment precisely, and state the retention problem in one sentence.
Map the returning user journey from re-entry to post-lesson, and identify the single highest leverage moment to improve first.
Propose one primary product change and up to two supporting UX details, and explain why this approach should improve retention.
Name one primary success metric and two guardrail metrics.
Describe a simple experiment plan, including what you would compare and one major risk or tradeoff.

Constraints

Work within Duolingo's existing mobile app, email, and push notification channels.
Do not assume a pricing change, new content type, or major curriculum rewrite.
Prioritize one intervention that a small team could test in a single quarter.

Format

Use headings: user and problem, journey diagnosis, recommendation, metrics, experiment and risks.

How Duolingo actually played it

A screen by screen teardown of how Duolingo keeps people coming back, from the mascot and notifications to lessons, rewards and streaks. Each observation is paired with a lesson, which makes it a handy template for practising your own teardowns.

Tie every observation to a lesson a team could reuse
A mascot and well timed reminders can carry a lot of retention work
Rewards work best when the next step is always obvious

Built from Duolingo: Gamification for Retention (Product Teardown Case Study #2) by Tear Them Down.