Drops vs Relativity Lab

Join over 50 million people who use Drops for free language lessons. It’s fast, fun, and easy! Practice vocabulary in Spanish, Japanese, French, Korean, Chinese, German, English. Discover 55+ different new languages with Drops! Learn new languages while playing games. You can become fluent, learn vocabulary and common phrases in Hebrew, Arabic, Russian, and Hindi. Set goals, unlock achievements, and get rewards! • Become fluent in a foreign language with this language learning app • Learn to read characters and scripts from different alphabets like Korean, Japanese, Chinese, Hebrew, Arabic, Russian, and Hindi • Custom illustrations for each vocabulary word makes it easy to remember • From beginner to expert levels, grow your foreign language vocabulary • A professionally curated vocabulary list with more than 3,000 words and phrases • Game-like language lessons that make language learning fun and effective • Level up! Track your progress and get rewards • Professional voice artists and sound design with correct dialect pronunciations • Learn to speak languages like Arabic, Chinese (Mandarin), English (British), English (American), French, German, Icelandic, Italian, Japanese, Korean, Portuguese (European), Russian, Spanish (Mexican), Spanish (European), Tagalog, Ainu, Arabic (Egyptian), American Sign Language (ASL), Basque, Bosnian, Cantonese, Catalan, Chti, Croatian, Danish, Dutch, Esperanto, Estonian, Finnish, Galician, Greek, Greenlandic, Hawaiian, Hebrew, Hindi, Hungarian, Igbo, Indonesian, Irish, Maori, Norwegian, Persian, Polish, Portuguese (Brazilian), Romanian, Samoan, Sanskrit, Serbian, Swahili, Swedish, Swiss German, Thai, Turkish, Ukrainian, Vietnamese, Welsh, and even Yoruba! "By focusing on visually appealing games and vocab, Drops aims to lower the barrier preventing users from exploring a new language and, ultimately, accessing the social and economic benefits knowing that language may provide." - TechCrunch We are featured by CNET, Forbes, VentureBeat and many other places too! Try Drops Premium with a 7 day free trial. Download the app to learn about different membership options, and register to learn all about exclusive discounts. Payment will be charged to your iTunes Account at confirmation of Drops premium. Afterwards your account will be charged for renewal within 24-hours prior to the end of the current period. Auto-renewal may be turned off at any time by going to your settings in the iTunes Store after purchase. You can cancel your subscription anytime, and you won't be charged in the next billing cycle. Privacy Policy and Terms of Use: http://languagedrops.com/privacypolicy.html

Relativity Lab is a professional educational app designed to help students, teachers and science enthusiasts explore the ideas of Einstein’s relativity and modern cosmology through structured learning, interactive simulations and visual explanations. The app covers special relativity, general relativity, GPS clock correction, gravitational waves, black holes, famous experiments, physics dictionary support, guided learning routes, classroom teaching tools and a full Cosmology Institute. FEATURES Einstein Academy Follow a structured learning pathway covering key concepts in relativity, spacetime, time dilation, gravity and modern physics. Interactive Relativity Lab Use visual simulations to explore abstract physics ideas in a clearer and more practical way. GPS Relativity Learn why satellite navigation needs relativistic correction and how tiny timing differences matter in real engineering. Solar System Relativity Compare relativistic effects across different objects and gravitational environments. Black Hole Explorer Explore event horizons, photon spheres, strong gravity and key black-hole concepts using educational visual tools. Gravitational Waves Understand inspiral, merger and ringdown stages, and learn how spacetime ripples connect to Einstein’s theory. Famous Experiments Review major experimental evidence including the 1919 eclipse test, Mercury’s perihelion, GPS verification and gravitational wave detection. Physics Dictionary Search and review important terms in English, Traditional Chinese and Simplified Chinese. Cosmology Institute Explore the Big Bang, Hubble’s Law, redshift, dark matter, dark energy, cosmic microwave background, observatory missions, research tools, visual simulations and guided learning paths. Teacher and Classroom Mode Use lesson planning tools, student activity sheets, discussion prompts and assessment rubrics for classroom-style learning. Portfolio and Mastery Tools Complete quizzes, revision cards, learning portfolios, milestone summaries, screenshot planners and certificate preparation tools. Relativity Lab is designed for educational use. It uses simplified models and visualisations to support understanding. It is not intended to replace formal scientific analysis, professional research software or official academic instruction.