Brand voice has to come from a system, not just vibe
Before writing a single guideline, we pulled together how the product actually talked today across onboarding, paywall, and support copy, and sat down with stakeholders (such as retention, growth, and content teams) to find out what each of them actually needed. Alongside that, we looked at how established consumer apps handle their own tone of voice, including Duolingo, Headspace, and Revolut, to see how they structured and communicated guidelines that people across a company would actually use.