DivShot is a great new tool for working with Twitter Bootstrap. Using it, creating prototypes of interfaces using a popular CSS framework has become disgraceful.

Log in using GitHub and Google accounts, all elements support drag-and-drop, custom CSS, export code, support for SASS, SCSS, LESS and more.
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When creating a new page, there are several ready-made page types:

There are a dozen different topics:

Switch between different types of devices:

Convenient Layout configurator:

The service is free in the public beta, tariff plans will appear next year.