# #ef5739

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

## Values

- Hex: `#ef5739`
- RGB: rgb(239, 87, 57)
- HSL: hsl(10, 85%, 58%)
- OKLCH: oklch(0.656 0.193 33.1)
- Relative luminance: 0.2546
- Nearest named color: Angry Flamingo (#f04e45, Δ 2.213) — https://brandsweets.com/colors/angry-flamingo
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/ef5739

## Tints & shades

- Tints (toward white): #f0674c, #f2775f, #f48771, #f59784, #f7a797, #f8b7aa, #fac7bd, #fbd7d0, #fde7e3, #fef7f6
- Shades (toward black): #ed4321, #de3412, #c62e10, #aa280e, #92220c, #7b1d0a, #5e1608, #471106, #2a0a03, #130402

## Harmonies

- Complementary: #39d1ef
- Analogous: #ef3976, #efb239
- Triadic: #39ef57, #5739ef
- Split-complementary: #39efb2, #3976ef
- Tetradic: #76ef39, #39d1ef, #b239ef

## Colors that go with #ef5739

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 #ef5739 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Alpine (https://brandsweets.com/palettes/cool#alpine), Diner (https://brandsweets.com/palettes/vivid#diner), Dusk (https://brandsweets.com/palettes/cool#dusk), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty). — https://brandsweets.com/colors/cadetblue
- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #ef5739: 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), HubSpot (https://brandsweets.com/colors/brands/hubspot-com), Harbour (https://brandsweets.com/palettes/cool#harbour), Audi (https://brandsweets.com/colors/brands/audi-com). — https://brandsweets.com/colors/charcoal
- **Amber** #ffbf00 [pool] — Amber is paired with #ef5739 in 8 real palettes, including Ember and Google's brand system, as the accent. Seen in: Ember (https://brandsweets.com/palettes/bold#ember), Google (https://brandsweets.com/colors/brands/google-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave), Maple (https://brandsweets.com/palettes/warm#maple). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 8 real palettes, including Monzo's brand system and Glossier's brand system put Blue beside #ef5739, as the accent. Seen in: Monzo (https://brandsweets.com/colors/brands/monzo-com), Glossier (https://brandsweets.com/colors/brands/glossier-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Doordash (https://brandsweets.com/colors/brands/doordash-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #ef5739: 5 real palettes, including Tide's brand system and NASA's brand system, as the lead colour. Seen in: Tide (https://brandsweets.com/colors/brands/tide-com), NASA (https://brandsweets.com/colors/brands/nasa-gov), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Cobalt Pop (https://brandsweets.com/palettes/bold#cobalt-pop). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #ef5739 in 8 real palettes, including Pizza Hut's brand system and Redfin's brand system, as the supporting colour. Seen in: Pizza Hut (https://brandsweets.com/colors/brands/pizzahut-com), Redfin (https://brandsweets.com/colors/brands/redfin-com), Snyk (https://brandsweets.com/colors/brands/snyk-io), Wise (https://brandsweets.com/colors/brands/wise-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #ef5739: 15 real palettes, including PlanetScale's brand system and Strava's brand system, as the accent. Seen in: PlanetScale (https://brandsweets.com/colors/brands/planetscale-com), Strava (https://brandsweets.com/colors/brands/strava-com), Etsy (https://brandsweets.com/colors/brands/etsy-com), Postman (https://brandsweets.com/colors/brands/postman-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #ef5739: 8 real palettes, including Figma's brand system and Replit's brand system, as the accent. Seen in: Figma (https://brandsweets.com/colors/brands/figma), Replit (https://brandsweets.com/colors/brands/replit), Google (https://brandsweets.com/colors/brands/google-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave). — https://brandsweets.com/colors/dodgerblue

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

- On white (#ffffff): 3.45:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #de3412 (4.56:1); AA: background → #242424 (4.5:1); AAA: text → #a5270d (7.25:1)
- On black (#000000): 6.09:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #f16f55 (7.15:1)

## Brands using this color

- **Figma** — primary #f24e1e (Δ 1.918) — https://brandsweets.com/colors/brands/figma
- **Figma** — logoRed #f24e1e (Δ 1.918) — https://brandsweets.com/colors/brands/figma

## 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/ef5739-c4a79c-62cbaa-2d281f-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: "#ef5739" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.