QZBrain vs LangKai

A calm daily practice for everyday sharpness. Five curated games, about five minutes, at the difficulty you choose. Fully offline. YOUR DAILY WORKOUT One tap starts a five-game session built for you — about five minutes, no repeated games, and it runs at the difficulty level you pick. When it ends, you are done. Nothing nags you to keep going. NINE ADAPTIVE GAMES, THREE AREAS • Memory — Matrix Recall, Pattern Focus, Path Memory, Number Flow, Emoji Match, Reverse Recall • Attention & Speed — Matrix Scan • Numbers — Rapid Math (with +, −, ×, and ÷ that unlock as you level up) and Set Shift Every game has its own adaptive staircase: succeed and it steps up, slip and it eases off. Four difficulty tiers, Novice to Expert, unlock as your performance earns them. CALM BY DESIGN Memory games are untimed. You complete each board at your own pace — no countdown ticking over your shoulder. Sessions are short and self-contained, so QZBrain fits into your day instead of taking it over. ONE HONEST SCORE NeuroIndex condenses each session into a single number from 100 to 999, built from your speed, accuracy, consistency, and the level you reached. It measures your progress in these games — it is not an IQ score and not a clinical measure, and we will never pretend otherwise. SEE YOUR PROGRESS The Insight tab keeps the picture simple: a 30-day average, your weekly trend, a per-game breakdown, and the Milestones you have earned. Personal bests are tracked for every game. ARCADE MODE When you want a looser run, Arcade is survival play: keep the clock alive as long as you can and chase your best run. It stays separate from your training history. YOURS, QUIETLY • Fully offline — train anywhere, no connection needed • Light, dark, or system appearance, plus three themes • Available in 11 languages FREE AND PLUS Free, always: the daily workout, four practice games, two arcade games, and the default theme. QZBrain Plus — monthly, yearly, or a one-time lifetime purchase — unlocks the full game library, every arcade game, advanced Insight analytics, targeted coaching tips, and extra themes. QZBrain is a general wellness product for everyday cognitive exercise and entertainment. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any condition. Scores are training feedback, not clinical or IQ assessments. QZBrain Plus is an auto-renewing subscription, available monthly or yearly (a one-time lifetime purchase is also offered). Payment is charged to your Apple ID at purchase confirmation. A subscription renews automatically for the same period and price unless it is cancelled at least 24 hours before the end of the current period; you can manage or cancel it anytime in your App Store account settings. Terms of Use (EULA): https://qzbrain.app/terms Privacy Policy: https://qzbrain.app/privacy

LangKai is a serious —and addictive— way to actually learn languages, from A1 to C2. SIX LANGUAGES, IN YOUR LANGUAGE • Learn English (Cambridge focus), French, Spanish, Chinese, Japanese and Russian. • Use the app in Spanish, English or French: explanations and hints appear in the language you pick. • A gamified CEFR path with XP, daily streaks, quests and a weekly league. SIMULATED OFFICIAL EXAMS • Two modes: a short version (quick review) and an official version (same length and number of questions as the real exam). • Cambridge, DELF/DALF, HSK, JLPT and TORFL. • In the official version, questions appear in the exam's language, just like the real test. • Mistake review: after each exam you go through every mistake with the correct answer, its explanation and the listening transcript. EVERYTHING TO MASTER THE LANGUAGE • Reading and listening comprehension, Use of English and grammar, vocabulary and writing systems (hanzi, kana, Cyrillic). • Daily practice and a mistakes bank so you never repeat the same errors. FREE AND PREMIUM • Start free with the language you pick and its full A1→C2 path. • LangKai Premium unlocks all languages, the official exam mode, long-form comprehension and removes daily limits. Monthly or annual subscription; cancel anytime. No ads. No third-party trackers. Your data is yours. A Comas Industries product. SUBSCRIPTION LangKai Premium is an auto-renewable subscription (monthly or annual). Payment is charged to your Apple account at confirmation of purchase and renews automatically unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://app.langkai.app/privacidad