English Grammar Radar

Grammar Radar is an AI-powered English grammar quiz platform that helps you master grammar through simple O/X (True/False)
questions.

Zero Friction Learning
Just tap O or X — no complex input needed. One question at a time, flashcard-style, with instant feedback and explanations.

13 Grammar Categories
Tense, Articles, Prepositions, Subject-Verb Agreement, Relatives, Conjunctions, Subjunctive, Comparatives, Verbals, Modals,
Passive Voice, Word Order, and Idioms.

Radar Chart Analysis
Visualize your strengths and weaknesses across all 13 grammar areas with an interactive radar chart. Track category trends over 7
to 90 days.

Adaptive Difficulty
Questions automatically adjust to your skill level (1-5). Score high and the challenge increases. Struggle and it eases up.

Spaced Repetition System (SRS)
Smart review scheduling for long-term retention. The system tracks your mistakes and schedules reviews at optimal intervals.

100+ Achievement Badges
Stay motivated with 11 badge categories and 4 rarity tiers. Earn XP bonuses and climb from Level 1 to 10.

Tier System
Compete with learners worldwide: Iron, Bronze, Silver, Gold, Platinum, Diamond. See your real-time percentile ranking.

Topic and Exam Modes
Practice with 4 topics: Business, Daily Life, Travel, Entertainment.
Prepare for 6 exams: TOEIC, TOEFL, IELTS, Cambridge, EIKEN, TEPS.

Activity Calendar
Track your study habits with a GitHub-style 90-day heatmap. Build streaks and maintain daily goals.

9 Languages Supported
UI available in English, Korean, Japanese, German, French, Chinese (Traditional), Portuguese (Brazil), Spanish, and Thai.

Free: 10 questions per day
Premium: Unlimited questions, exam packs, AI personalization, and advanced analytics.

Start scanning your grammar today!