Cereby vs (Open Source) Mental Math

Cereby is the AI study companion that knows your classes. Import your syllabus and Cereby tracks your performance, your schedule, your assignments, and your weak points — then turns any topic into the video, podcast, quiz, or flashcard deck you'll actually study from. AN AI THAT DOES THE WORK Ask Cereby for anything and it gets to work right in the conversation: it writes study notes, builds quizzes and flashcard decks, produces podcasts and video lectures, draws diagrams, illustrates concepts, and schedules your study sessions. One chat in, real study materials out. TURN ANY TOPIC INTO • Videos — short narrated, animated video lectures from any topic, PDF, or set of notes • Podcasts — two-host audio explainers you can play on the way to class • Quizzes — adaptive practice that focuses on what you keep getting wrong • Flashcards — spaced-repetition decks that resurface each card right before you'd forget it • Diagrams — flowcharts, timelines and mind maps drawn from an explanation WHAT CEREBY KNOWS • Your performance — what you're acing and what you're missing • Your class schedule — every lecture, lab, and section • Your next exam — when it is and exactly what's on it • Your assignments — what's due, in what order • Your weak points — and the fastest way to fix each one YOUR MATERIALS, ORGANIZED Everything you make or upload lives in one library: notes, quizzes, flashcards, videos, podcasts, images, and files. Write in a rich document editor with Cereby Mini, an AI that drafts, explains, and rewrites right beside your work — and have any note read aloud to you, with the words highlighted as they are spoken. YOUR SEMESTER, HANDLED Drop in a syllabus or connect Canvas. Cereby reads your assignments, exam dates, and reading load, then builds a week-by-week plan around your real schedule — so you always know what to study next. STUDY FROM YOUR OWN FILES Upload a PDF, a lecture recording, or a video and chat with it directly. Paste a YouTube link and study from the transcript. Scan a page from a textbook or a handout with your camera and Cereby reads the text off it. Cereby Focus answers with citations that jump straight to the page or timestamp, so you can check every claim against the source. FREE TO START Cereby is free to download and free to start — notes, basic quizzes, and flashcards included. Optional auto-renewing subscriptions (Lite, Pro, and Premium; monthly or annual, from $9.99/month) unlock higher monthly usage, more storage, and premium AI tools. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. Terms of Service: https://cereby.ai/terms Privacy Policy: https://cereby.ai/privacy AI-generated content can contain mistakes — always double-check important information before you rely on it. Bring your syllabus. Cereby takes it from there.

A free, open-source mental math trainer. No ads, no paywalls, no locked content — every exercise and difficulty is included. Sharpen your arithmetic with quick timed tests, custom drills, and a library of mental-math tricks. Everything runs offline and your progress stays on your device. FEATURES Timed Tests A daily 60-second challenge plus sprints, a two-minute marathon, per-operation tests, and a hard mixed test — at four difficulty levels, each with best scores. Custom Trainer Pick a number domain (Times tables, Natural, Decimal, Money, Huge), choose one or more exercises, and set per-exercise difficulty from Easy to Super hard. All the Operations Addition, subtraction, multiplication, division, squares, square roots, fractions, percentages, and modulo. Mental Math Tricks Dozens of step-by-step tricks for faster addition, subtraction, multiplication, division, and squares — with worked examples and favorites. Practice Any Trick Every trick comes with a 60-second drill built for it: × 11 drills, squares ending in 5, numbers near 100, and more. Magic Square A number puzzle: make every row, column, and diagonal add up to the same total. Four levels, from 1-9 up to bigger number sets. Progress Tracking Solved totals, accuracy, best run, daily streak, longest streak, and a weekly activity view. Fast Sessions An on-screen keypad with instant answer checking and haptics. No ads. No paywalls. No account required. 100% Open Source The complete source code is public - see it, audit it, or contribute at https://github.com/Open-Apps-Studio/mental-math