iNaturalist vs Mathalon

Your photos of plants, animals, fungi, and more can help protect nature all around the world. iNaturalist is free, nonprofit, and community-powered. iNaturalist helps millions of people learn about and document the nature around them. Point your camera at plants, animals, and fungi to get instant identification suggestions, then share your photos or sound recordings as an "observation." Then, see your observation get reviewed by a global community of knowledgeable nature-lovers to turn it into a useful data point for science and conservation efforts. Your everyday moments of curiosity can directly contribute to protecting nature, and you don't need any previous experience or knowledge to get started. iNaturalist is a mission-driven nonprofit dedicated to connecting people to nature and advancing biodiversity science and conservation, and is freely available thanks to the generous support of our community. KEY FEATURES • Identify species from anywhere in the world • Contribute to science by sharing your observations • Keep a record of species you see • Explore and protect biodiversity • Connect with and learn from other nature enthusiasts

Mathalon turns math into a competitive arena. Daily challenge — one carefully-picked problem every day. Build a solve streak. Rush — 5-minute live climbing race. Solve fast, stay ahead, top the live leaderboard. Ranked 1v1 — Glicko-2 matchmaking against another player in your rating zone. Head-to-head, best of five. Practice — thousands of problems from arithmetic to olympiad. Filter by topic and difficulty. Escape rooms and mystery cases — narrative puzzle chains that reward mathematical reasoning. Every solve updates your rating. Every match sharpens it. Climb the global leaderboard.