Vietnamese Vocab Test

越语词汇家 is a free, fully offline vocabulary size test for Vietnamese.\n\nFeatures:\n• Quick Test (30 words), Standard Test (50), Deep Test (100)\n• Challenge Mode — how many words can you answer correctly in a row?\n• Estimated vocabulary with confidence interval (IRT-based)\n• SM-2 spaced repetition for word review\n• Shareable result certificate\n• English & Chinese UI, follows your system language\n• No account, no ads, no data collection\n\nNote: vocabulary size is a statistical estimate for reference only.