Wolfram|Alpha is a general-purpose computational knowledge engine that can step you through solutions to a broad range of math problems. It can handle function plotting, statistical calculations and differential equation solving. It's good for students and professionals who need explanations and answers fast.
Another good option is AI Math Solver, a free online tool that uses large language GPT models like GPT-4o to solve math problems and word problems. It includes a conversational AI bot so you can interact with it to solve problems and accepts input in a variety of formats, including text, images, PDFs and CSV files, so it's a good option for those who like a little flexibility in their tools.
Symbolab is another option, with step-by-step calculations for algebra, trigonometry, calculus and other math subjects. It can solve word problems and graph functions, too, and offers interactive exercises and quizzes. The service is available in multiple languages and has strong privacy protections.