# #ef4839

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

## Values

- Hex: `#ef4839`
- RGB: rgb(239, 72, 57)
- HSL: hsl(5, 85%, 58%)
- OKLCH: oklch(0.639 0.206 29.2)
- Relative luminance: 0.2328
- Nearest named color: Angry Flamingo (#f04e45, Δ 1.281) — https://brandsweets.com/colors/angry-flamingo
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/ef4839

## Tints & shades

- Tints (toward white): #f0594c, #f26b5f, #f47c71, #f58e84, #f79f97, #f8b1aa, #fac2bd, #fbd3d0, #fde5e3, #fef6f6
- Shades (toward black): #ed3221, #de2312, #c61f10, #aa1b0e, #92170c, #7b130a, #5e0f08, #470b06, #2a0703, #130302

## Harmonies

- Complementary: #39e0ef
- Analogous: #ef3985, #efa339
- Triadic: #39ef48, #4839ef
- Split-complementary: #39efa3, #3985ef
- Tetradic: #85ef39, #39e0ef, #a339ef

## Colors that go with #ef4839

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

- **Cadet Blue** #5f9ea0 [harmony, pool: complementary] — Cadet Blue sits directly opposite #ef4839 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), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/cadetblue
- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #ef4839: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. Seen in: Tumblr (https://brandsweets.com/colors/brands/tumblr-com), Audi (https://brandsweets.com/colors/brands/audi-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), HubSpot (https://brandsweets.com/colors/brands/hubspot-com). — https://brandsweets.com/colors/charcoal
- **Steel Blue** #4682b4 [harmony, pool: split] — Steel Blue is a split-complement of #ef4839: 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), Launch Orange (https://brandsweets.com/palettes/bold#launch-orange), Substack (https://brandsweets.com/colors/brands/substack-com), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #ef4839 in 8 real palettes, including Google's brand system and Heatwave, as the accent. Seen in: Google (https://brandsweets.com/colors/brands/google-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave), Ember (https://brandsweets.com/palettes/bold#ember), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 9 real palettes, including Glossier's brand system and Monzo's brand system put Blue beside #ef4839, as the accent. Seen in: Glossier (https://brandsweets.com/colors/brands/glossier-com), Monzo (https://brandsweets.com/colors/brands/monzo-com), Doordash (https://brandsweets.com/colors/brands/doordash-com), Readymag (https://brandsweets.com/colors/brands/readymag-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #ef4839: 5 real palettes, including NASA's brand system and Tide's brand system, as the lead colour. Seen in: NASA (https://brandsweets.com/colors/brands/nasa-gov), Tide (https://brandsweets.com/colors/brands/tide-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Behance (https://brandsweets.com/colors/brands/behance-net). — https://brandsweets.com/colors/cobalt
- **Denim** #1560bd [pool] — Designers have shipped Denim with #ef4839: 16 real palettes, including Postman's brand system and PlanetScale's brand system, as the accent. Seen in: Postman (https://brandsweets.com/colors/brands/postman-com), PlanetScale (https://brandsweets.com/colors/brands/planetscale-com), ElevenLabs (https://brandsweets.com/colors/brands/elevenlabs-io), Strava (https://brandsweets.com/colors/brands/strava-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #ef4839: 7 real palettes, including Google's brand system and Figma's brand system, as the lead colour. Seen in: Google (https://brandsweets.com/colors/brands/google-com), Figma (https://brandsweets.com/colors/brands/figma), Databricks (https://brandsweets.com/colors/brands/databricks-com), Replit (https://brandsweets.com/colors/brands/replit). — https://brandsweets.com/colors/dodgerblue

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

- On white (#ffffff): 3.71:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #e72413 (4.51:1); AA: background → #1c1c1c (4.59:1); AAA: text → #af1c0e (7.01:1)
- On black (#000000): 5.66:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #f26b5f (7.04:1)

## Brands using this color

- **Google** — secondary #ea4335 (Δ 1.361) — https://brandsweets.com/colors/brands/google-com
- **NASA** — accent #f64137 (Δ 1.41) — https://brandsweets.com/colors/brands/nasa-gov
- **Clerk** — secondary #ef4444 (Δ 1.422) — https://brandsweets.com/colors/brands/clerk-com

## 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/ef4839-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: "#ef4839" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.