Notion is the productivity-and-knowledge-management app whose design language popularized warm-neutral backgrounds, serif display headings, and the "well-formatted Markdown document" aesthetic across modern SaaS. Founded by Ivan Zhao in San Francisco, its visual identity pairs deep navy accents with a warm off-white canvas that feels more like paper than screen.

The result is an interface that reads like a beautifully typeset book — generous line-heights, restrained color, and hand-drawn illustrations as decorative flourishes. Notion's design codified what "writing software" looks like in the 2020s, spawning an entire genre of warm-cream productivity tools from Coda to Reflect to Tana.