Astrodemia is a free, Duolingo-style astronomy learning app that teaches you to recognize the night sky through daily practice. Our Bortle-adaptive curriculum starts with the stars visible from your city and progressively builds to the full dark-sky experience.
What you learn: 88 IAU constellations, 50 bright named stars (Sirius, Vega, Betelgeuse…), 7 key asterisms (Orion's Belt, Big Dipper, Pleiades…), and practical sky skills like star-hopping and magnitude reading.
How it works: 15 interactive quiz types (multiple choice, tap-on-sky, lasso, free-text, connect-the-stars, naked-eye timer) powered by the FSRS spaced repetition algorithm. Sessions take 3–5 minutes a day.
Available in English, Español, 中文, 日本語, 한국어, Français, Deutsch, and Português. Offline-first — all progress stored in your browser. Free, no account required.
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