# #ef0109

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

## Values

- Hex: `#ef0109`
- RGB: rgb(239, 1, 9)
- HSL: hsl(358, 99%, 47%)
- OKLCH: oklch(0.598 0.245 28.7)
- Relative luminance: 0.1839
- Nearest named color: Alarm (#ec0003, Δ 0.649) — https://brandsweets.com/colors/alarm
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/ef0109

## Tints & shades

- Tints (toward white): #fe0b14, #fe252c, #fe3e45, #fe585d, #fe767b, #fe8f93, #ffa9ac, #ffc2c4, #ffdbdd, #fff5f5
- Shades (toward black): #da0108, #c10107, #ad0107, #980106, #840105, #6b0104, #560003, #420003, #290002, #140001

## Harmonies

- Complementary: #01efe7
- Analogous: #ef0180, #ef7001
- Triadic: #09ef01, #0109ef
- Split-complementary: #01ef70, #0180ef
- Tetradic: #80ef01, #01efe7, #7001ef

## Colors that go with #ef0109

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 #ef0109: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. Seen in: Logitech (https://brandsweets.com/colors/brands/logitech-com), Codecademy (https://brandsweets.com/colors/brands/codecademy-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), Audi (https://brandsweets.com/colors/brands/audi-com). — https://brandsweets.com/colors/charcoal
- **Royal Blue** #4169e1 [harmony, pool: triadic] — Royal Blue completes a triad with #ef0109 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Vercel (https://brandsweets.com/colors/brands/vercel), Pizza Hut (https://brandsweets.com/colors/brands/pizzahut-com), WWE (https://brandsweets.com/colors/brands/wwe-com), Toyota (https://brandsweets.com/colors/brands/toyota-com). — https://brandsweets.com/colors/royalblue
- **Steel Blue** #4682b4 [harmony, pool: split] — Steel Blue is a split-complement of #ef0109: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Wired (https://brandsweets.com/colors/brands/wired-com), NASCAR (https://brandsweets.com/colors/brands/nascar-com), Wendy's (https://brandsweets.com/colors/brands/wendys-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #ef0109 in 7 real palettes, including Wired's brand system and McDonald's's brand system, as the accent. Seen in: Wired (https://brandsweets.com/colors/brands/wired-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com), Google (https://brandsweets.com/colors/brands/google-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 8 real palettes, including native Cybersecurity's brand system and Doordash's brand system put Blue beside #ef0109, as the accent. Seen in: native Cybersecurity (https://brandsweets.com/colors/brands/crowdstrike-com), Doordash (https://brandsweets.com/colors/brands/doordash-com), Gap (https://brandsweets.com/colors/brands/gap-com), Glossier (https://brandsweets.com/colors/brands/glossier-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #ef0109: 5 real palettes, including Walgreens's brand system and NASA's brand system, as the accent. Seen in: Walgreens (https://brandsweets.com/colors/brands/walgreens-com), NASA (https://brandsweets.com/colors/brands/nasa-gov), Behance (https://brandsweets.com/colors/brands/behance-net), Tide (https://brandsweets.com/colors/brands/tide-com). — https://brandsweets.com/colors/cobalt
- **Denim** #1560bd [pool] — Designers have shipped Denim with #ef0109: 18 real palettes, including Netflix's brand system and ElevenLabs's brand system, as the accent. Seen in: Netflix (https://brandsweets.com/colors/brands/netflix), 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). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #ef0109: 6 real palettes, including Databricks's brand system and Google's brand system, as the accent. Seen in: Databricks (https://brandsweets.com/colors/brands/databricks-com), Google (https://brandsweets.com/colors/brands/google-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): 4.49:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #e90109 (4.69:1); AA: background → #050505 (4.54:1); AAA: text → #b20107 (7.24:1)
- On black (#000000): 4.68:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #fe6267 (7.16:1)

## Brands using this color

- **Vercel** — danger #ee0000 (Δ 0.328) — https://brandsweets.com/colors/brands/vercel
- **native Cybersecurity** — secondary #ec0000 (Δ 0.677) — https://brandsweets.com/colors/brands/crowdstrike-com
- **Tinder** — secondary #ec180e (Δ 0.843) — https://brandsweets.com/colors/brands/tinder-com
- **Twitch** — accent #eb0400 (Δ 0.847) — https://brandsweets.com/colors/brands/twitch-tv
- **Wired** — secondary #eb0000 (Δ 0.872) — https://brandsweets.com/colors/brands/wired-com
- **Databricks** — secondary #eb1600 (Δ 1.019) — https://brandsweets.com/colors/brands/databricks-com
- **Doordash** — secondary #eb1700 (Δ 1.051) — https://brandsweets.com/colors/brands/doordash-com
- **Gatorade** — secondary #ea0000 (Δ 1.071) — https://brandsweets.com/colors/brands/gatorade-com
- **LG** — secondary #ea1917 (Δ 1.084) — https://brandsweets.com/colors/brands/lg-com
- **Mattel** — secondary #ee0024 (Δ 1.321) — https://brandsweets.com/colors/brands/mattel-com
- **Pizza Hut** — secondary #e91c24 (Δ 1.559) — https://brandsweets.com/colors/brands/pizzahut-com
- **Nintendo** — secondary #e60012 (Δ 1.876) — https://brandsweets.com/colors/brands/nintendo-com
- **Vodafone** — primary #e60000 (Δ 1.881) — https://brandsweets.com/colors/brands/vodafone-com
- **Vodafone** — accent #e60000 (Δ 1.881) — https://brandsweets.com/colors/brands/vodafone-com
- **Netflix** — primary #e50914 (Δ 1.984) — https://brandsweets.com/colors/brands/netflix

## 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/ef0109-c49f9c-62cb95-2d251f-f1e9ed?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: "#ef0109" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.