The Startup Framework License is simple.
Use Startup Framework for multiple projects, both personal and commercial.
But there are some things you can't do:
Use Startup Framework or source files for website/app generators.
Redistribute or resell Startup Framework or source files.
Offer Startup Framework to users of your hosting or blogging service.
Create Templates, Themes and Plugins for sale or free distribution.
If you cannot find the answer to your question, we'll be happy to help.