PhotoStudy is described as 'Stuck on a Math or Science Problem?' and is an app in the Education & Reference category. There are more than 10 alternatives to PhotoStudy for a variety of platforms, including Android, iPhone, iPad, Online / Web-based and Android Tablet. The best alternative is Wolfram Alpha, which is free. Other great apps like PhotoStudy are Mathematica (Paid), fxSolver (Free), Photomath (Freemium) and Cymath (Freemium).
Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.
Mathway provides students with the tools they need to solve their math problems. With tens of millions of problems already solved, Mathway is the #1 online problem solving resource available for students, parents, and teachers.