FontBlacklistApplied [rule] v1.0.0

The primary display and body typefaces in author CSS MUST NOT be drawn from @impeccable/constraint-font-blacklist (Inter, Roboto, Arial, Helvetica Neue, Space Grotesk, DM Sans, Nunito, Poppins, Open Sans, Lato). These fonts are the statistical mode of LLM-generated and shadcn/Tailwind-default output and produce a visually undifferentiated 'commodity' result.

Checks

• @community/check-font-blacklist-applied

Applies To

@community/type-html-artifact

Meta

• License: Apache-2.0
• License Provenance: package-authorship-claim

Severity

high

Severity Combination

primary display or body font is blacklisted, no exception cited → BLOCK
fallback-only blacklisted font (e.g. system stack)             → PASS
blacklisted font used for dense data (with exception)          → WARN

Failure Mode

Output looks identical to thousands of other shadcn-scaffolded apps; brand identity is invisible; reviewer's first impression is 'AI generated this'.

Remediation

• Pick from @impeccable/constraint-font-blacklist.approved-alternatives (Geist, Söhne, Canela, Freight, Tiempos, GT Super, Roc Grotesk, Berkeley Mono).
• If budget forbids licensed fonts, use Geist (free) or a free serif like Spectral / Source Serif 4 — anything outside the top-10 Google Fonts.
• Keep blacklisted fonts only as system-stack fallbacks, e.g. font-family: 'Söhne', 'Helvetica Neue', sans-serif.

Exceptions

• • Case: Dense data table UI
  • Allowed When: Inter is used in a @impeccable/persona-dense-pragmatist context where tabular figures and screen optimization dominate; document the choice.
• • Case: Inherited brand decision
  • Allowed When: The brand book mandates a blacklisted font; record the decision in BRAND.md and annotate the CSS with a comment.

FontBlacklistApplied [rule] v1.0.0

The primary display and body typefaces in author CSS MUST NOT be drawn from @impeccable/constraint-font-blacklist (Inter, Roboto, Arial, Helvetica Neue, Space Grotesk, DM Sans, Nunito, Poppins, Open Sans, Lato). These fonts are the statistical mode of LLM-generated and shadcn/Tailwind-default output and produce a visually undifferentiated 'commodity' result.

Checks

• @community/check-font-blacklist-applied

Applies To

@community/type-html-artifact

Meta

• License: Apache-2.0
• License Provenance: package-authorship-claim

Severity

high

Severity Combination

primary display or body font is blacklisted, no exception cited → BLOCK
fallback-only blacklisted font (e.g. system stack)             → PASS
blacklisted font used for dense data (with exception)          → WARN

Failure Mode

Output looks identical to thousands of other shadcn-scaffolded apps; brand identity is invisible; reviewer's first impression is 'AI generated this'.

Remediation

• Pick from @impeccable/constraint-font-blacklist.approved-alternatives (Geist, Söhne, Canela, Freight, Tiempos, GT Super, Roc Grotesk, Berkeley Mono).
• If budget forbids licensed fonts, use Geist (free) or a free serif like Spectral / Source Serif 4 — anything outside the top-10 Google Fonts.
• Keep blacklisted fonts only as system-stack fallbacks, e.g. font-family: 'Söhne', 'Helvetica Neue', sans-serif.

Exceptions

• • Case: Dense data table UI
  • Allowed When: Inter is used in a @impeccable/persona-dense-pragmatist context where tabular figures and screen optimization dominate; document the choice.
• • Case: Inherited brand decision
  • Allowed When: The brand book mandates a blacklisted font; record the decision in BRAND.md and annotate the CSS with a comment.

Relations

related: [@impeccable/constraint-font-blacklist, @impeccable/principle-distinctiveness, @impeccable/anti-pattern-ai-slop-palette, @community/rule-color-blacklist-brand] see-also: [@community/check-font-blacklist-applied] validates-with: [@impeccable/constraint-font-blacklist, @impeccable/principle-distinctiveness]

Applies To

@community/type-html-artifact

Meta

• License: Apache-2.0
• License Provenance: package-authorship-claim

Severity

high

Validates With

• @impeccable/constraint-font-blacklist
• @impeccable/principle-distinctiveness

Severity Combination

primary display or body font is blacklisted, no exception cited → BLOCK
fallback-only blacklisted font (e.g. system stack)             → PASS
blacklisted font used for dense data (with exception)          → WARN

Failure Mode

Output looks identical to thousands of other shadcn-scaffolded apps; brand identity is invisible; reviewer's first impression is 'AI generated this'.

Remediation

• Pick from @impeccable/constraint-font-blacklist.approved-alternatives (Geist, Söhne, Canela, Freight, Tiempos, GT Super, Roc Grotesk, Berkeley Mono).
• If budget forbids licensed fonts, use Geist (free) or a free serif like Spectral / Source Serif 4 — anything outside the top-10 Google Fonts.
• Keep blacklisted fonts only as system-stack fallbacks, e.g. font-family: 'Söhne', 'Helvetica Neue', sans-serif.

Exceptions

• • Case: Dense data table UI
  • Allowed When: Inter is used in a @impeccable/persona-dense-pragmatist context where tabular figures and screen optimization dominate; document the choice.
• • Case: Inherited brand decision
  • Allowed When: The brand book mandates a blacklisted font; record the decision in BRAND.md and annotate the CSS with a comment.

See Also

• @community/check-font-blacklist-applied