Duolingo is a mobile-first language-learning platform founded in 2011. Lessons are organized into small “skills” aligned to CEFR-style abilities. The CEFR (Common European Framework of Reference for Languages) is a widely used six-level scale (A1–C2) that describes what learners can do in a language (e.g., introduce yourself, narrate past events). In practice, that means Duolingo maps present small, bite-size units to these established targets and adapts difficulty as you progress through its modules and lessons. While it includes a premium, paid, tier, much of the app is available for free and is built on mechanics discussed in the previous section like instant feedback, and gamified practice to keep study frequent and low-stakes.
Short bursts, everywhere: Duolingo replaces big tests with 1–3 minute check-ins you can do anytime, so progress accumulates without the pressure of 'the big test'.
Correct -> retry -> adapt: Each prompt gives instant correction, a quick retry, and then adjusts difficulty; spaced review resurfaces weak spots later.
Talk to the phone, not a person: Mic and dictation prompts reduce social pressure, encouraging more attempts and frequent practice.
Shows the fix, then tries again: You see exactly what was wrong and the correct wording, then get a quick retry to apply it immediately.
Adjusts what comes next: The app serves a similar item (or lowers/raises difficulty) to check if the change stuck, keeping practice targeted.
Builds a small next step: Hints and examples suggest one concrete tweak like an ending, a word order, a sound to ensure your very next attempt is specific, not vague.
Daily habit loop: Streaks, gentle reminders, and XP goals nudge you to show up every day without a timetable.
Small, doable sessions: 1–3 minute tasks with a clear next step lower the barrier to starting, so it’s easy to keep going.
Visible progress & light accountability: A clear path (skills/crowns), quick wins, and optional leagues/friends make progress tangible and sticking with it rewarding. At one point the app creators changed the icon so the mascot appeared sick while stating that "Duo is quite literally sick of reminding everyone to do their lessons!"