Nuten is an iPhone app developed by Allen Katouli that allows users to quickly create and share equations using their favorite apps. This educational and fun app covers a wide range of math topics, including algebra, geometry, trigonometry, calculus, physics, and chemistry.

With Nuten, users can create and save equations for later reference. The app offers a variety of features to enhance equation creation, such as fractions (both simple and complex), equations with superscript and subscript, geometry symbols, trigonometric functions, algebraic expressions, differential and integral calculus, logic and set theory, square root and n-root calculations, limit functions, derivatives and differential equations, chemical equations, and equations from classical and quantum physics.

Nuten also allows users to save and name their favorite equations, providing easy access to frequently used formulas. The app keeps a history of all equations created, making it convenient to revisit and edit previous work.

Additionally, Nuten comes preloaded with a selection of hand-picked equations, providing users with a starting point for their math explorations. Users can also share high-resolution equation images through their favorite apps, such as Messages, Mail, Twitter, Facebook, Snapchat, and more.

Overall, Nuten: The Math Keyboard is a comprehensive and user-friendly app that offers a wide range of math tools and features for both educational and practical purposes.