Reader++ vs Space Atlas

Reader++ helps you understand books, papers, and manuals as you read. Select a word or passage for an AI explanation without leaving the page. Ask questions about a PDF or your whole library for free. Get answers with citations pointing to the exact lines in your documents. Explore related ideas, ask follow-up questions, or test yourself with quizzes. Save explanations and summaries to revisit later, and follow your trail back to where you started. Keep your PDFs organized with folders and bookmarks. Your files stay on your device, with only the text needed for AI features sent for processing. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Space Atlas: Cosmos Guide Explore the universe from your pocket. Space Atlas turns astronomy into an immersive experience with interactive 3D visuals, real-time space data, daily NASA imagery, educational articles, and challenging quizzes built for curious minds. EXPLORE THE SOLAR SYSTEM IN 3D Navigate a beautiful interactive solar system with animated orbits, smooth zoom controls, and detailed planet views. Rotate, pinch, and explore celestial bodies up close. LIVE SPACE DATA Stay connected to what is happening above Earth: Track the ISS in real time Follow upcoming rocket launches Check aurora activity with the Kp index Monitor near-Earth asteroids See how many astronauts are currently in space NASA IMAGE OF THE DAY Discover a new astronomy image every day with NASA’s Astronomy Picture of the Day, complete with clear explanations available in your language. DEEP SPACE LEARNING Read hundreds of educational articles across astronomy, cosmology, black holes, galaxies, exoplanets, nebulae, space exploration, astrobiology, observation techniques, and space technology. SMART SPACE QUIZZES Test your knowledge with a large quiz library across multiple difficulty levels. Build streaks, earn XP, unlock badges, and progress from beginner to expert. SKY OBSERVATION TOOLS Plan your stargazing sessions with moon phase details, viewing conditions, and helpful night-sky guidance. MADE FOR SPACE LOVERS Space Atlas is built for anyone who wants to understand the cosmos, from beginners discovering astronomy for the first time to enthusiasts looking for a richer daily space companion. Features include: Night mode for comfortable sky watching Offline access to articles and quizzes Daily challenges and streak tracking XP, badges, and progress stats English, French, Spanish, and Italian support Free to start, with Pro access for the full experience