Anzan Expert vs Cerebri

Ever find that "6 + 9" is easy, but "7 + 9" feels tricky? Do you struggle with certain number combinations? I did! As the author of this app, I used to find combinations involving 8 or 9 particularly challenging. I also found it difficult to quickly calculate prices while shopping. That's why I created this flash calculation app – to improve my own mental math skills! And while developing and testing it, I've already noticed a real improvement in my addition skills. I'm confident you'll see a boost in your own mental math abilities too! I hope you have fun and enjoy your challenges! HOW TO US Numbers flash on the screen at a set interval. Add them up in your head! STAGES There are 20 stages, each combining one of 5 different digit lengths (1 to 5 digits) with one of 4 flash intervals (6, 3, 1, and 0.5 seconds). The most challenging stage is 5 digits with a 0.5-second interval – a true test of your skills! If you ever reach that level, you'll be a real "expert"! Each stage has a unique name. - 1 digit, 6-second interval: "Shell" stage - 1 digit, 3-second interval: "Prawn" stage - 1 digit, 1-second interval: "Turtle" stage and so on... EXPERT MEDALS AND LEVELS Earn an expert medal for each stage by answering correctly 5 times in a row at that stage. Your current level is determined by the highest-level stage where you've earned a medal. How far can you go? Find out now! PRACTICE Unlike the timed challenges, you can advance at your own pace by tapping the buttons. Easily switch between numbers, review previous values, and practice as much as you like until you feel confident and ready to ace the challenges! REVIEW After each challenge, review the numbers you just worked on. Practice the questions you missed until you can solve them correctly within the time limit. OTHER USEFUL FEATURES - Register multiple challengers so that the whole family can enjoy the app on a single device! - Customize the look with multiple colorful themes - great for distinguishing each challenger! - Share your success! Post your challenge results with a photo on social media.

Cerebri turns any study material into flashcards in seconds — entirely on your iPhone or iPad, with no uploads, no cloud AI, and no account required. Every PDF, photo of notes, and class recording is processed on-device by Apple Intelligence. Your material never leaves your hands. CAPTURE ANYTHING Import a PDF or Word doc, snap a photo of handwritten notes, or drop in a lecture recording. Audio and video are transcribed and converted to a flashcard deck automatically — all on-device. STUDY SMARTER WITH SPACED REPETITION The proven SM-2 algorithm schedules each card just before you'd forget it. Spend time on what you don't know, skip what you do. AN AI TUTOR WITH NO USAGE CAP Miss a card? Get a clear 2–3 sentence explanation instantly. Want to go deeper? Chat with a tutor that knows your entire deck — unlimited questions, on-device, no per-query fees. PRIVATE BY DESIGN There is no server. Nothing you import or study is ever uploaded. Cerebri works fully offline. $6.99 ONCE. YOURS FOREVER. One payment unlocks everything, permanently. No subscription, no per-scan fees, no AI usage limits. Free features: manual card creation, unlimited decks, card-flip study, PDF/DOCX flashcard extraction, export your decks to PDF/CSV and an inline tutor explanation for difficult cards. Premium ($6.99 one-time) unlocks: SM-2 spaced repetition, photo / audio / video flashcard creation, and the unlimited deck-scoped AI tutor chat. AI features require a device with Apple Intelligence.