This website features a web-based integral calculator that allows the computation of integrals in the user's browser. The integral calculator supports both indefinite integrals (antiderivatives) and definite integrals. If the user enters "cos(x)", the answer "sin(x)" will be given. The calculator also supports far more complex mathematical expressions including functions composed of trigonometric functions, hyperbolic functions and exponential functions (and their respective inverse functions). When computing definite integrals, improper integrals with limits such as (negative) infinity are supported as well. The integration variable can be selected by the user, and the integral calculator can optionally simplify all input and output expressions. Calculations are performed using the Computer Algebra System (CAS) "Maxima", which is one of the oldest and most robust CAS. Both the user's input and the answers are displayed as graphical formulas using MathJax. Calculations can be shared with other users.