Free alternative to step-by-step-solution feature of Wolfram|Alpha Pro?
Another great alternative is: https://www.symbolab.com/
It has also got a premium area, but its step-by-step solutions are free.
Aditya at https://softwarerecs.stackexchange.com/questions/48818/free-alternative-to-step-by-step-solution-feature-of-wolfram-alpha-pro says it is not free anymore. @itaton can you confirm?
Still works for me on the website I linked. I don't know about (and haven't tested) any mobile app, which is what the question Nicolas Raoul referenced is asking.
After using symbolab for a while, very disappointed. It's not free (requires payment for many advanced features, pretty much like WolframAlpha), it's just horribly buggy, and the functionality is very limited. You can't even copy and paste the formula in the graphing area, for example.
Open Omnia is an alternative to Wolfram Alpha Pro and Symbolab. Disclaimer: I am the developer.
You can find the web application here: https://openomnia.com and the android app here: https://play.google.com/store/apps/details?id=com.openomnia.openomnia
Feel free to try it out.
I've just found fxSolver... It doesn't seem to show all the workings, but it does provide help and background on the inputs, and allows plotting.