Federgraph vs Lingo Books

Federgraph is a function plotter app to visualize a special built in function z = f(x, y) in 3D. The physical model behind the app is a system of springs. The built in function produces a variety of colorful pictures, some of which appear to have a face. Changing the parameters of the physical model will trigger a recalculation of the image.

Learn a language by actually enjoying it – read real stories, hear native narration, and remember what you learn through games. No boring drills. Lingo Books turns reading into the fastest, most natural way to learn English, Spanish, French, German, Italian, Portuguese, or Russian. WHY READERS LOVE LINGO BOOKS – Instant translations – tap a word or sentence for context-aware meaning while you read, with no flow broken – Bilingual stories – see your language and the one you're learning side by side, so you're never lost – Listen like a local – native-speaker narration with synced text to train your ear and pronunciation – Lessons for every level – guided courses from absolute beginner to advanced – Learn through play – crosswords, word-pairs, matching, and blitz games turn new words into long-term memory – Your own dictionary – every word you save is sorted and ready to review – Track your progress – streaks, daily goals, levels, and achievements keep you coming back – Works offline – download books and translation models, learn on the plane or the subway PERFECT FOR Beginners who want a gentler start than flashcard apps, travelers prepping for a trip, students building vocabulary, and anyone who's tried other apps and quit. Just 10 minutes of reading a day adds up fast. 7 LANGUAGES English – Spanish – French – German – Italian – Portuguese – Russian Download Lingo Books free and read your first story today. Notes: Lingo Books includes an optional premium subscription. This is offered on a monthly or annual basis. If you choose to purchase a subscription your payment will be charged to your iTunes account. Subscriptions will automatically renew unless canceled within 24-hours before the end of the current period. You can turn off auto-renewal at any time by going to your Account Settings on the App Store after purchase. Privacy Policy: https://telegra.ph/Privacy-Policy-02-22-35