问老虎 (wèn lǎohǔ) · Ask the Tiger
Every copy of duiduidui! comes with 老虎 (lǎohǔ, "tiger"), an AI tutor that lives inside the app. Tap 问老虎 (wèn lǎohǔ, "ask the tiger") and start a conversation: about a character you can't crack, a grammar point that won't stick, or your own study habits.
A Tutor That Knows the Dictionary
老虎 has the entire 200,000-entry dictionary at its fingertips. Ask what a character means, how a word is used, or why two near-synonyms aren't interchangeable, and 老虎 looks up the real entries (characters, words, phrases, sample sentences, and the radicals inside them) instead of guessing. Because every entry is linked to its components and the expressions it appears in, 老虎 can explain not just what something means, but how it's built and where it fits.
It's just as comfortable with the bigger picture. Ask it to explain tone sandhi, the difference between 了 (le) and 过 (guò), or the logic behind a measure word, and you get a clear, contextual answer grounded in examples you can study right away.
A Tutor That Knows You
What makes 老虎 different from a generic chatbot is that it can see your learning. With your permission, it reads your skill level, your study-session history, the characters and words you've mastered, and the ones that keep tripping you up. So you can ask the questions that actually matter: "What should I review before my trip?", "Why do I keep forgetting this word?", or "Am I ready for HSK 4?", and get advice that's about your Chinese, not Chinese in the abstract.
老虎 can look at how often you study, where your progress has stalled, and which cognitive patterns are slowing you down, then suggest concrete next steps: a collection to focus on, a habit to adjust, a weak spot to shore up.
A Tutor That Can Act
老虎 doesn't just talk. It can reach into the app and do things for you. Run into a word that isn't in the dictionary yet? 老虎 can create a brand-new entry for it, complete with pinyin, translation, and example sentences. Ask it to star a phrase for later, group a set of characters under a custom tag, or add today's new vocabulary to your favorites, and it's done, with no menu-digging required.
It can also help you navigate your social circle: see who you're studying alongside, how your friends are progressing, and where you might learn from each other.
You Decide What 老虎 Can See
老虎's reach is yours to grant. Reading the dictionary, seeing your progress, looking at your study sessions, browsing your social graph, and creating or editing records are each a separate permission you control. Turn on only what you're comfortable with, and change your mind anytime. duiduidui! never shares your learning with anyone, human or AI, that you haven't explicitly allowed.
Prefer to bring your own assistant? The same toolset 老虎 uses is available to outside AI agents through our public MCP server, so Claude, ChatGPT, or Gemini can help with your Chinese too.