# #ef2101

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

## Values

- Hex: `#ef2101`
- RGB: rgb(239, 33, 1)
- HSL: hsl(8, 99%, 47%)
- OKLCH: oklch(0.607 0.236 31)
- Relative luminance: 0.1944
- Nearest named color: Arcade Fire (#ee3311, Δ 1.528) — https://brandsweets.com/colors/arcade-fire
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/ef2101

## Tints & shades

- Tints (toward white): #fe2c0b, #fe4225, #fe583e, #fe6e58, #fe8876, #fe9e8f, #ffb4a9, #ffcac2, #ffe0db, #fff6f5
- Shades (toward black): #da1e01, #c11b01, #ad1801, #981501, #841201, #6b0f01, #560c00, #420900, #290600, #140300

## Harmonies

- Complementary: #01cfef
- Analogous: #ef0158, #ef9701
- Triadic: #01ef21, #2101ef
- Split-complementary: #01ef97, #0158ef
- Tetradic: #58ef01, #01cfef, #9701ef

## Colors that go with #ef2101

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 #ef2101: 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
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #ef2101 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Netflix (https://brandsweets.com/colors/brands/netflix), Coinbase (https://brandsweets.com/colors/brands/coinbase), Five Guys (https://brandsweets.com/colors/brands/fiveguys-com), Wellness (https://brandsweets.com/palettes/warm#wellness). — https://brandsweets.com/colors/seagreen
- **Steel Blue** #4682b4 [harmony, pool: split] — Steel Blue is a split-complement of #ef2101: 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), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Wendy's (https://brandsweets.com/colors/brands/wendys-com). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #ef2101 in 7 real palettes, including Wired's brand system and Google's brand system, as the accent. Seen in: Wired (https://brandsweets.com/colors/brands/wired-com), Google (https://brandsweets.com/colors/brands/google-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] — 8 real palettes, including Doordash's brand system and native Cybersecurity's brand system put Blue beside #ef2101, as the accent. Seen in: Doordash (https://brandsweets.com/colors/brands/doordash-com), native Cybersecurity (https://brandsweets.com/colors/brands/crowdstrike-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 #ef2101: 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), 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 #ef2101: 18 real palettes, including ElevenLabs's brand system and Netflix's brand system, as the accent. Seen in: ElevenLabs (https://brandsweets.com/colors/brands/elevenlabs-io), Netflix (https://brandsweets.com/colors/brands/netflix), 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 #ef2101: 7 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), Replit (https://brandsweets.com/colors/brands/replit), Figma (https://brandsweets.com/colors/brands/figma). — https://brandsweets.com/colors/dodgerblue

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

- On white (#ffffff): 4.3:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #e41f01 (4.67:1); AA: background → #0d0d0d (4.52:1); AAA: text → #ad1801 (7.22:1)
- On black (#000000): 4.89:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #fe6148 (7.02:1)

## Brands using this color

- **Tinder** — secondary #ec180e (Δ 1.103) — https://brandsweets.com/colors/brands/tinder-com
- **Doordash** — secondary #eb1700 (Δ 1.19) — https://brandsweets.com/colors/brands/doordash-com
- **Databricks** — secondary #eb1600 (Δ 1.232) — https://brandsweets.com/colors/brands/databricks-com
- **LG** — secondary #ea1917 (Δ 1.555) — https://brandsweets.com/colors/brands/lg-com
- **Vercel** — danger #ee0000 (Δ 1.57) — https://brandsweets.com/colors/brands/vercel
- **Pizza Hut** — primary #ee3124 (Δ 1.618) — https://brandsweets.com/colors/brands/pizzahut-com
- **Walgreens** — secondary #e62600 (Δ 1.73) — https://brandsweets.com/colors/brands/walgreens-com
- **native Cybersecurity** — secondary #ec0000 (Δ 1.8) — https://brandsweets.com/colors/brands/crowdstrike-com
- **Twitch** — accent #eb0400 (Δ 1.823) — https://brandsweets.com/colors/brands/twitch-tv
- **Wired** — secondary #eb0000 (Δ 1.937) — https://brandsweets.com/colors/brands/wired-com
- **Hyundai** — secondary #e63312 (Δ 1.964) — https://brandsweets.com/colors/brands/hyundaiusa-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/ef2101-c4a69c-62cba6-2d271f-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: "#ef2101" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.