Speed calculation vs Astralis

Speed Calc is a simple mental arithmetic trainer for building speed and accuracy. Choose addition, subtraction, multiplication, or division, set the number range and question count, then start practicing with a focused keypad interface. The app tracks your time, mistakes, daily best, and personal best so you can see your progress over time. Features: Addition, subtraction, multiplication, and division practice Adjustable number range, difficulty, and question count Timer with daily best and personal best records Calendar-based practice history Multiple theme colors Optional sound feedback Remove ads with a one-time purchase Speed Calc is designed for short daily practice sessions and focused arithmetic training.

Astralis turns your phone into a window on the night sky. Point your phone up and Look Up instantly reveals whatever bright object you're facing — planet, star, or the Moon — rendered as a real, lit 3D sphere with NASA-derived textures, at its true current phase. Save any of them as a full-screen wallpaper. TONIGHT A sunset-to-sunrise timeline of everything happening in the sky where you are: moonrise and moonset, planet rise/set times, a stargazing score based on real cloud cover and light pollution, upcoming rocket launches, and visible ISS passes computed with a real orbital propagator — not a canned schedule. COMPASS An AR-style compass that points you straight at any visible planet, star, or the ISS, live. SOLAR SYSTEM An animated 3D orrery — all eight planets, real relative orbital speeds, real NASA-derived surface textures, starting from today's actual planetary configuration. Tap any planet for its facts. Pinch to zoom, drag to orbit. EXPLORE A deep-sky catalog of 30 galaxies, nebulae, and star clusters — real astrophotography for every object, live altitude and rise/set times for your location. Built with real astronomy: positions are computed locally from NASA JPL orbital elements, not fetched from a third-party ephemeris service. No account required. No ads. No tracking.