What version of bootstrap does the HubSpot Template Builder use? Last updated: October 20, 2017 Available For: Marketing: Basic, Pro, Enterprise Sales: N/A Service: N/A The HubSpot Template Builder uses a 12 column grid system based on Bootstrap 2.x to allow template designers to quickly build fully responsive webpages within the HubSpot content platform. Read more here: Designers documentation - The COS responsive grid Designers documentation - Included COS files (layout.css)
