Black Hole Sandbox

A realistic black hole, in the palm of your hand. Black Hole Sandbox gives you a scientifically accurate black hole, ray-traced live on your iPhone. It traces light through curved spacetime using the equations of general relativity: light that comes too close falls into the shadow, and light that passes nearby bends around it. The galaxy behind stretches into arcs, the far side of the disc lifts above and below the shadow, and a thin ring of photons wraps its edge. Orbit it, zoom in, and watch the light bend as you move. Two ways to see it - In 3D: set it against a whole galaxy or a field of stars, and watch the lensing bend everything behind it as you orbit. - In augmented reality: the star of the show. Put it in your living room, sit it on a table, and walk around it as it warps your room behind it. Design your own Real black holes are only the starting point. - Shape and light: the size of the shadow, how bright the photon ring burns and how far its glow reaches, the gap, width and tilt of the accretion disc. - Color: 37 palettes of single and dual colors, or pick your own inner and outer colors. - Texture: 14 dynamic textures, from smooth swirls and drifting wisps to bands, clumps and cells. Set their strength and detail, spin the disc faster or slower, and add wind to curl the swirls toward the center. - Facets: break the disc into 14 geometric patterns, like triangles, diamonds, scales, spirals and gems, and set how fast they turn to make it shimmer. - Emojis: feed it your favorite emojis and watch a swarm of them orbit the shadow, glowing as they go, bent by the same lensing as the stars. - Photos: make one of your own photos the accretion disc and watch it spin around the abyss. Your photo stays on your device. Twelve presets come built in, and you can save as many of your own as you like. Build a realistic black hole or one that could never exist, then set it on your coffee table. It's a small corner of a much bigger universe, from Altroad Studio. $0.99 on the App Store: https://apps.apple.com/app/id6810945165