Content style guides

Government Digital Service (GDS) style guide
Covers style, spelling and grammar conventions for all content published on GOV.UK

Opattern: content style guide – oPower

Style.ONS – A guide to writing about statistics
Includes sections on data visualisation and writing statistical bulletins.

Design systems

Opattern – Opower’s design system

Polaris – Shopify’s design system

UX writing

Writing for user interfaces – GOV.UK

Planning and writing text messages and emails – GOV.UK