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Minimum Font Weight 400

NEVER

NEVER: Use font weights below 400 — thin and light weights (100–300) hurt readability on low-DPI screens and for low-vision users.

Font weights below 400 should not be used — they reduce readability

Bad

Good

Why it matters

Thin and light font weights (100-300) can be difficult to read, especially on low-resolution screens, small sizes, or for users with visual impairments. Stick to regular (400) and above for body text and UI elements.

References

Built by Gleb Stroganov, design engineer at Evil Martians.

The rules come from other people's skills and guidelines — Vercel, Rauno Freiberg, @Ibelick, impeccable, Emil Kowalski, Tailwind, RAMS — each one credited on the Sources page. The work here is extraction and wiring: every rule is pulled into one corpus, given a good and a bad example you can operate, a MUST/SHOULD/NEVER rule an agent can paste, and a link back to where it came from.