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contentVercel

Tabular Numbers

MUST

MUST: Tabular numbers for comparisons (`font-variant-numeric: tabular-nums` or a mono like Geist Mono)

Use tabular-nums for comparisons and tables

Bad

Good

Why it matters

Proportional numbers have varying widths (1 is narrower than 8), making columns misalign. Tabular numbers have uniform width, so digits stack vertically in tables and make comparisons easier. Essential for prices, metrics, and data tables. The same property carries a second switch worth reaching for on identifiers: `font-variant-numeric: slashed-zero` cuts a stroke through the zero so an order number, an API key, a serial, or a licence plate cannot be misread as an `O` by someone transcribing it.

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.