Hanzi Rush (汉字冲刺) is a free web and mobile application for learning Chinese characters (Hanzi). It uses Speed-FSRS, an adaptive spaced repetition algorithm that optimizes review intervals based on both accuracy and response speed. It supports HSK 2.0 (levels 1-6), HSK 3.0 2021 standard (levels 1-9), YCT (levels 1-4), and 214 Kangxi radicals with 16,560 vocabulary entries.

Yes. HSK levels 1-2 are free forever with all 5 training modes and unlimited sessions. Premium unlocks HSK levels 3-9, advanced analytics, and priority support.

What is Speed-FSRS and how is it different from regular spaced repetition?

Speed-FSRS is an enhanced version of the FSRS-5 spaced repetition algorithm. Unlike traditional SRS that only considers whether you got an answer right or wrong, Speed-FSRS also factors in how fast you responded. Faster correct answers indicate stronger memory, resulting in longer review intervals. This reduces unnecessary reviews while ensuring difficult characters are seen more often.

Which HSK levels does Hanzi Rush support?

Hanzi Rush supports both HSK standards: HSK 2.0 (levels 1-6, ~5,000 characters) and HSK 3.0 2021 (levels 1-9, 10,969 entries). It also includes YCT levels 1-4 (598 entries for younger learners) and all 214 Kangxi radicals with stroke order animations.

How is Hanzi Rush different from Duolingo or other Chinese learning apps?

Hanzi Rush focuses specifically on Chinese character mastery rather than general language courses. Key differences: (1) Speed-FSRS algorithm adapts to your response speed, not just accuracy; (2) 5 specialized training modes including stroke order animation and brush-style writing practice; (3) Full HSK 3.0 (2021) support with 10,969 entries; (4) Database-backed progress that persists across devices; (5) Offline-first mobile app with automatic sync.

Does Hanzi Rush work offline?

Yes. The web version works as a Progressive Web App (PWA) with offline support. The mobile app (iOS and Android) is fully offline-first — you can train without an internet connection, and your progress automatically syncs when you reconnect.

What training modes are available?

Hanzi Rush offers 5 training modes: (1) Learning — study new characters with pinyin and translations; (2) Test — recall characters under time pressure; (3) Quick Challenge — rapid-fire speed drills; (4) Voice Input — speak pinyin using speech recognition; (5) Writing Practice — draw characters with brush-style calligraphy and ink effects, including animated stroke-order sequences.

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