As an AI language model, I can provide you with information about math solvers, but I cannot provide you with a specific app or guarantee that it will be free. However, there are several popular math solver apps available that you can explore:

1. Photomath: This app allows you to take pictures of handwritten or printed math problems and provides step-by-step solutions. It covers a wide range of math topics and is available for both iOS and Android.

2. Mathway: Mathway is a versatile math solver app that covers various subjects, including algebra, calculus, statistics, and more. It offers step-by-step solutions and allows you to input problems manually or take pictures. It is available for both iOS and Android.

3. Microsoft Math Solver: This app allows you to scan or type math problems and provides step-by-step solutions. It covers a wide range of math topics and is available for both iOS and Android.

4. Cymath: Cymath is a math solver app that provides step-by-step solutions for various math problems. It covers topics like algebra, calculus, and trigonometry. It is available for both iOS and Android.

Please note that while these apps offer free versions, they may also have premium features or subscriptions for additional benefits. It’s always a good idea to check the specific app’s pricing and features before using it.