# #ef3a2a

A color — warm, vivid, playful, bold. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#ef3a2a`
- RGB: rgb(239, 58, 42)
- HSL: hsl(5, 86%, 55%)
- OKLCH: oklch(0.625 0.219 29.7)
- Relative luminance: 0.2154
- Nearest named color: Arcade Fire (#ee3311, Δ 1.403) — https://brandsweets.com/colors/arcade-fire
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/ef3a2a

## Tints & shades

- Tints (toward white): #f04c3d, #f26154, #f47367, #f5847a, #f79a92, #f8aca5, #fabdb8, #fbcfcb, #fde5e3, #fef6f6
- Shades (toward black): #ed2412, #d52110, #be1d0e, #a6190c, #8e160b, #721109, #5a0e07, #420a05, #2b0703, #130301

## Harmonies

- Complementary: #2adeef
- Analogous: #ef2a7c, #ef9d2a
- Triadic: #2aef3a, #3a2aef
- Split-complementary: #2aef9d, #2a7cef
- Tetradic: #7cef2a, #2adeef, #9d2aef

## Colors that go with #ef3a2a

Named partners (harmony on the OKLCH wheel, co-occurrence in curated palettes and brand systems, and the neutrals that carry it), best first:

- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #ef3a2a: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. Seen in: Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), Audi (https://brandsweets.com/colors/brands/audi-com), Logitech (https://brandsweets.com/colors/brands/logitech-com), Tumblr (https://brandsweets.com/colors/brands/tumblr-com). — https://brandsweets.com/colors/charcoal
- **Steel Blue** #4682b4 [harmony, pool: split] — Steel Blue is a split-complement of #ef3a2a: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Wired (https://brandsweets.com/colors/brands/wired-com), Launch Orange (https://brandsweets.com/palettes/bold#launch-orange), NASCAR (https://brandsweets.com/colors/brands/nascar-com). — https://brandsweets.com/colors/steelblue
- **Cadet Blue** #5f9ea0 [harmony, pool: complementary] — Cadet Blue sits directly opposite #ef3a2a on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Diner (https://brandsweets.com/palettes/vivid#diner), Alpine (https://brandsweets.com/palettes/cool#alpine), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty). — https://brandsweets.com/colors/cadetblue
- **Amber** #ffbf00 [pool] — Amber is paired with #ef3a2a in 7 real palettes, including Google's brand system and Wired's brand system, as the accent. Seen in: Google (https://brandsweets.com/colors/brands/google-com), Wired (https://brandsweets.com/colors/brands/wired-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 9 real palettes, including Doordash's brand system and Glossier's brand system put Blue beside #ef3a2a, as the accent. Seen in: Doordash (https://brandsweets.com/colors/brands/doordash-com), Glossier (https://brandsweets.com/colors/brands/glossier-com), native Cybersecurity (https://brandsweets.com/colors/brands/crowdstrike-com), Gap (https://brandsweets.com/colors/brands/gap-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #ef3a2a: 5 real palettes, including NASA's brand system and Walgreens's brand system, as the lead colour. Seen in: NASA (https://brandsweets.com/colors/brands/nasa-gov), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Tide (https://brandsweets.com/colors/brands/tide-com), Behance (https://brandsweets.com/colors/brands/behance-net). — https://brandsweets.com/colors/cobalt
- **Denim** #1560bd [pool] — Designers have shipped Denim with #ef3a2a: 18 real palettes, including ElevenLabs's brand system and L'Oréal's brand system, as the accent. Seen in: ElevenLabs (https://brandsweets.com/colors/brands/elevenlabs-io), L'Oréal (https://brandsweets.com/colors/brands/loreal-com), YouTube (https://brandsweets.com/colors/brands/youtube-com), Postman (https://brandsweets.com/colors/brands/postman-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #ef3a2a: 7 real palettes, including Google's brand system and Databricks's brand system, as the lead colour. Seen in: Google (https://brandsweets.com/colors/brands/google-com), Databricks (https://brandsweets.com/colors/brands/databricks-com), Figma (https://brandsweets.com/colors/brands/figma), Replit (https://brandsweets.com/colors/brands/replit). — https://brandsweets.com/colors/dodgerblue

## Contrast (WCAG 2.x, as text)

- On white (#ffffff): 3.96:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #e42311 (4.62:1); AA: background → #171717 (4.53:1); AAA: text → #af1b0d (7.03:1)
- On black (#000000): 5.31:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #f36a5e (7.03:1)

## Brands using this color

- **Pizza Hut** — primary #ee3124 (Δ 1.076) — https://brandsweets.com/colors/brands/pizzahut-com
- **Google** — secondary #ea4335 (Δ 1.331) — https://brandsweets.com/colors/brands/google-com
- **NASA** — accent #f64137 (Δ 1.985) — https://brandsweets.com/colors/brands/nasa-gov

## Fonts for this mood

- warm: https://brandsweets.com/fonts/mood/warm
- playful: https://brandsweets.com/fonts/mood/playful
- bold: https://brandsweets.com/fonts/mood/bold

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/ef3a2a-c4a49c-62cba1-2d261f-f1e9ec?lock=0&style=vibrant
(Humans lock/regenerate in the tool; the URL is the state — read `lock=` back to see what they kept.)

## Connect an agent

Point any MCP client at the BrandSweets colors endpoint for the same engine:

- Endpoint: https://mcp.brandsweets.com/colors/mcp
- Tools: `analyze_color` (e.g. `analyze_color({ color: "#ef3a2a" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.