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The full Liu experience, no paywalls on learning.

HSK 1-6 content library
Spaced repetition with all question types
Streaks, achievements & leaderboards
Create and share sets with friends

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More control, flexibility, and insight for serious learners.

2 streak freezes every week
Custom daily goals and study pace
Focused review for weak or selected words
Detailed accuracy and retention insights

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Limited release

Founder's Edition

$99

one-time

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Lifetime Pro access as Liu evolves, plus permanent Founder recognition.

Lifetime Pro access as Liu evolves
Founder badge and app-credit recognition
No recurring subscription

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Founder access includes the Pro tier as Liu evolves and eligible future Pro capabilities as they launch. Recurring Pro subscriptions can be canceled or managed directly through Stripe Billing from Settings. Gifted Pro access remains fixed-duration and separate from recurring subscription management.