Polyglot vs Relativity Simulator

Polyglot helps you learn several languages at the same time, all on your device and all private. Most apps make you pick one language and follow one rigid path. Polyglot is built for people who want more. Study Spanish, French, Japanese, Korean, English and more side by side, with tools that adapt to you. WHY POLYGLOT - Learn many languages at once, with a color for each one so they never blur together. - Smart flashcards use proven spaced repetition so you review at the right moment. - A private, on-device AI tutor builds lessons, quizzes and conversations for any topic you pick. - Fast, friendly games turn daily practice into a habit. - Speak out loud and get instant pronunciation feedback. - Translate in a tap and save anything as a flashcard. - Your data stays on your device. No account required. SMART FLASHCARDS Polyglot schedules every card with a modern spaced repetition engine, so you spend time on the words you are about to forget and breeze past the ones you know. Each card has an example sentence and pronunciation, with text to speech in a single tap. Add a word from Home and its meaning fills itself in on your device. AN AI TUTOR IN YOUR POCKET Type any topic, like ordering food or a job interview, and Polyglot writes a focused lesson with vocabulary, useful phrases, a short overview and a tip, at the level you choose. Add the new words to your flashcards in one tap. Chat freely and get gentle, in context corrections, or take a fresh AI quiz made just for you. It runs on device, with Apple Intelligence or a model you can download, so your practice stays private. GAMES THAT MAKE IT STICK - Polyglot Match: find one word in every language you are learning. - Match Pairs: link words with their meanings. - Fill the Blank: complete the missing word. - Build the Sentence: arrange word tiles into real sentences. - Listen and Choose: train your ear. - Say It: speak the phrase and get scored. - Handwriting: practice kana, hangul and characters. Mix all of your languages in one session to get sharp at telling them apart. TRANSLATE ANYWHERE Quick Translate remembers your language pair, keeps your recent translations and turns any result into a flashcard. Choose Apple Translation or a downloadable model that works fully offline. SEE YOUR PROGRESS Track reviews, sessions and streaks. A clean chart and calendar show your activity at a glance, a mastery bar shows how far you have come in each language, and achievements celebrate the milestones. WORKS WHERE YOU ARE - Widgets for your Home Screen and StandBy, plus a control to start a review from Control Center or the Lock Screen. - Siri and Shortcuts: add a word, translate or open a deck by voice. - Made for iPhone Duo: cards open like a textbook, tabletop mode gives hands-free speaking drills, and the cover screen keeps your streak alive. - Great on iPad too. PRIVATE BY DESIGN Polyglot works without an account and keeps your learning on your device. Optional iCloud sync keeps your cards in step across your iPhone and iPad. LANGUAGES Learn Spanish, French, German, Italian, Portuguese, Japanese, Chinese, Korean and English. The app itself is available in 16 languages, so lessons and meanings are explained in the language you already know. Start today. Pick your languages, set a daily goal, and build your streak.

Relativity Simulator is an interactive relativity toolkit built strictly on the axiomatic foundations of modern physics. There is no "hard sci-fi" here — every result traces back to the Lorentz transformation of special relativity or the Einstein field equations of general relativity, and is verified against numerical truth fixtures. 【Real physics, not imagination】 · 20 interactive modules covering core effects from special relativity to black holes, gravitational waves, and curved spacetime; · Each module ships with precise charts, adjustable parameters, and a "Theory Card" with a fully visible derivation chain; · All demo numbers are recomputed locally on your device from real CODATA constants — nothing is fabricated. 【Phenomena you can verify yourself】 · Gravitational time dilation: why clocks run faster up high — ~80 ns/day faster atop Everest, ~38 µs/day faster on GPS satellites; · Twin paradox: fly to 4.22 light-years at 0.8c and the Earth twin ages 10.5 years while the traveler ages only 6.3; · Tidal disruption: why you get stretched into "spaghetti" falling into a black hole — small holes tear you outside the horizon, supermassive ones only after you cross it; · Plus light bending, gravitational lensing, the Schwarzschild horizon, frame dragging, and mass–energy equivalence E=mc². 【Built for learning and teaching】 · Volume-based progression: kinematics → gravitational field → black holes → cosmology → applications; · Bilingual (zh/en) system notes ship with every effect: derivation, physical quantities, and references; · Chinese / English UI follows your system language. 【Privacy first】 The app collects, stores, and transmits no personal data, embeds no third-party SDKs, and runs every computation locally on your device. Whether you are studying, teaching, or simply curious, Relativity Simulator lets you actually run the "invisible spacetime" and watch it.