Style Guide

A Style Guide is a document that outlines the visual and functional aspects of a brand, such as typography, color usage, logo placement, and tone of voice. It serves as a reference for maintaining consistency across different mediums and platforms, ensuring that all design elements align with the brand’s identity and goals.

A style guide is the document that makes brand consistency scalable — without it, every person who writes content, designs a slide, or builds a new feature makes slightly different decisions about colors, fonts, and tone. For SaaS companies growing their team, a style guide pays for itself the first time it prevents an off-brand design or misused logo from reaching a customer. It also dramatically accelerates onboarding for new designers and content creators.

Mailchimp's Content Style Guide is published openly and has become a reference for the industry — it covers not just grammar rules but voice, tone, and the principles behind their writing style. Their investment in documenting their style has made their brand voice unusually consistent across millions of touchpoints.