PhysKey Custom vs Derivon

A custom keyboard built for science and math enthusiasts. Say goodbye to the hassle of symbol input and streamline your typing on mobile. Features Type Greek letters (α, β, γ...) directly from the key layout Access frequently used physical constants and units in one tap Full coverage of math symbols (∫, Σ, √...) Works in every app — notes, social media, and more Perfect for writing science reports, logging experimental data, or chatting while studying. No more typing out "alpha" and hunting through conversion suggestions. Give PhysKey a try — simple, intuitive, and built for the way you think.

Master calculus through daily practice. Solve derivatives and integrals by intuition — no overthinking, just repetition. • Swipe through problems and build your skills • Earn Star Sand with every correct answer • Spin the Gacha to collect planets in your Gallery • Build a daily streak — never break the chain • Take Rank-Up Challenges as you progress • Play Shooting mode for a quick break • Track your streak, level up, and earn rewards Whether you're preparing for AP Calculus, university exams, or just sharpening your math skills, Derivon makes practice feel like a space adventure. 3 minutes a day. That's all it takes. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/