The Mathist is a touch optimized application for writing math notes and expressions. It has strong social integration, and by connecting your friends through Google+ or Facebook, you can share your notes, ideas and solutions, comment on other peoples work…
The Mathist 
HI,How can we develop something similar for off line usage? Is it possible to purchase source code? can we screen record the math solution and sell it?
rahu
Hello Rahu,
Thank you for your interest in The Mathist. Please send us an email to contact@themathist.com, so that we can discuss all the options. Generally we are open to any suggestions 🙂
Best Regards,
The Mathist Team