Photonarium

A pocket physics observatory: illustrated lessons that reshape to your age, hands-on simulations, quizzes, and a discovery for every day of the year. Fully offline.

Photonarium is a little physics observatory that lives entirely on your phone. Open it and you'll find illustrated lessons, experiments you can actually play with, quizzes that explain themselves, and a new discovery waiting for every day of the year. No internet, no sign-up, no ads — and nothing ever leaves your device.

The best part: it meets you where you are. Tell it who's exploring today, and the whole app reshapes itself around that answer.

One app, every age Same topics, the right depth for the reader: • Little Explorer — big pictures, one idea at a time • Curious Mind — short stories and simple "why does that happen?" • Deep Diver — real definitions and formulas, shown so they make sense • Master — the full picture: derivations, vectors, and harder problems to chew on Switch levels whenever you like. It's just a reading preference — not a birthday, not an account, nothing personal is ever asked for or saved.

Ten corners of physics Light & Color, Motion & Forces, Sound & Waves, Heat & Cold, Electricity & Magnets, Water & Air, Space & Gravity, Energy, Matter & Materials, and Simple Machines. Every topic starts by pointing out where you already run into it in daily life, and ends with real-world uses and a nudge toward a related lesson — so a quick look tends to turn into a long, happy wander.

Things you can poke at These aren't videos — they're little machines you steer. Bend a beam of light through a prism, swing a pendulum, send ripples across a wave tank, fling a satellite into orbit, wire up a circuit, drop a magnet through a coil, or watch a double-slit pattern build itself one dot at a time. Drag the sliders and the physics answers you back, live.

On this day in physics A discovery, invention, or mission for all 366 days of the year, each told as a short illustrated story that links straight to the lesson behind it. Check back tomorrow for a new one — or look up what happened on your birthday.

A sky that fills in as you learn Every category is a constellation. Finish a lesson and a star lights up; finish the whole category and its figure is drawn across your night sky. Quizzes always tell you why an answer is right, not just whether it was, and small badges mark the moments worth remembering.

Private, the whole way through • Asks for zero permissions — no location, camera, or contacts • Makes zero network calls — it works in airplane mode, forever • No ads, no analytics, no trackers, no third-party code • Rated 4+, with every topic written gently and age-appropriately • Your progress stays on your device and only your device

Made by hand in SwiftUI for iPhone and iPad, iOS 17 and later, with a calm polar-observatory look — glacier blue, snow white, and a little aurora light.