GrammarBattle vs Quarry

Grammar Battle: Master English Through Epic RPG Fights Turn your grammar practice into an addictive RPG game. Grammar Battle makes learning English fun, effective, and action-packed. Gameplay Features - Battle enemies using grammar knowledge - Wrong answer? Lose HP — just like a real fight - Level up from 1 to 50 and collect rewards - Unlock grammar tenses as you progress - Four battle arenas: Training, Single Tense, Mixed Tenses, and elite Boss Battles - Daily Quest with 5x rewards, once per day - Boss fights with typing and speed challenges - Track progress, streaks, and grammar mastery Educational Content Grammar Battle covers 15 English grammar topics — all 12 tenses plus three advanced topics: - Present Simple, Present Continuous, Present Perfect, Present Perfect Continuous - Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous - Future Simple, Future Continuous, Future Perfect, Future Perfect Continuous - Conditionals - Passive Voice - Modal Verbs Who is it for? - English language learners (intermediate to advanced) - Students preparing for language exams - Anyone wanting to improve their grammar in an entertaining way No account. No ads. Just you vs grammar. Download Grammar Battle and start your journey to becoming a grammar master!

Quarry is a focused, offline gym for data and coding interviews. 108 hand-picked problems across SQL, pandas, and Python — write real code, run it on your device, and get graded instantly. Everything runs on-device. The SQL and Python engines are built into the app, so there's no sign-up, no internet requirement, and nothing you write ever leaves your phone or iPad. Practice on a plane, on the subway, or anywhere. WHAT'S INSIDE • 108 problems across three tracks: SQL queries, pandas data wrangling, and Python algorithms & data structures. • Real execution, real grading. Your output is checked against the expected result — no self-marking. • Company tags. Filter problems by the company you're interviewing at. • Hints and full solutions when you're stuck. • Difficulty levels from Easy to Hard, grouped by topic. • A free-form Playground for scratch SQL and Python. • Universal app — designed for both iPhone and iPad. PRIVATE BY DESIGN No accounts. No analytics. No ads. No tracking. Quarry collects nothing and works fully offline. Whether you're prepping for a data analyst, data engineer, data scientist, or software role, Quarry gives you a quiet, fast place to actually practice.