BookStack is used by small to mid-sized engineering teams, IT departments, educational institutions, and self-hosting hobbyists. Public examples on TheirStack include Dallas Theological Seminary, Canadian Bank Note Company, and various IT services firms across the US, France, Germany, and Canada.

BookStack is used to build internal wikis, knowledge bases, runbooks, SOPs, onboarding manuals, and reference documentation. Teams typically run it as a private internal tool for their engineering, operations, or support staff. It works for any structured documentation that fits the books-and-chapters model.

BookStack can be configured to be publicly viewable, but it is not designed for branded customer-facing product docs. The theming is basic and there is no native custom-domain plus SSL workflow that competes with hosted docs platforms. For public product documentation, a tool focused on that use case is a better fit.