You don't have to use the Socratic iOS app to get answers to your questions, you can post your questions on the Socratic website as well.
For every question that you ask on the Socratic app, you get four learning resources to choose from
- explainers (bite-size content created by members of the Socratic community)
- answers posted on the Socratic website
As you can see, the app allows users to access content posted on the Socratic website, so you can go ahead and use the website directly if you don't have an iPhone (or don't want to use the app).