# #f31621

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

## Values

- Hex: `#f31621`
- RGB: rgb(243, 22, 33)
- HSL: hsl(357, 90%, 52%)
- OKLCH: oklch(0.612 0.242 27.2)
- Relative luminance: 0.1974
- Nearest named color: Assassin’s Red (#f60206, Δ 1.123) — https://brandsweets.com/colors/assassins-red
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/f31621

## Tints & shades

- Tints (toward white): #f42f39, #f5424b, #f65a62, #f76e75, #f9868c, #fa9ea3, #fbb1b5, #fccacc, #fddddf, #fef5f6
- Shades (toward black): #e40c17, #cb0b14, #b80a12, #a00810, #88070e, #6f060b, #570509, #440407, #2c0204, #130102

## Harmonies

- Complementary: #16f3e8
- Analogous: #f31690, #f37a16
- Triadic: #21f316, #1621f3
- Split-complementary: #16f37a, #1690f3
- Tetradic: #90f316, #16f3e8, #7a16f3

## Colors that go with #f31621

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 #f31621: 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), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), Codecademy (https://brandsweets.com/colors/brands/codecademy-com), 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 #f31621 — 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), Rotten Tomatoes (https://brandsweets.com/colors/brands/rottentomatoes-com), WWE (https://brandsweets.com/colors/brands/wwe-com). — https://brandsweets.com/colors/royalblue
- **Steel Blue** #4682b4 [harmony, pool: split] — Steel Blue is a split-complement of #f31621: 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 #f31621 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 native Cybersecurity's brand system and Doordash's brand system put Blue beside #f31621, 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 #f31621: 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 #f31621: 19 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), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #f31621: 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), 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): 4.24:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #e90c17 (4.64:1); AA: background → #0f0f0f (4.52:1); AAA: text → #b30912 (7.08:1)
- On black (#000000): 4.95:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #f76970 (7.21:1)

## Brands using this color

- **ElevenLabs** — primary #f41a2f (Δ 1.01) — https://brandsweets.com/colors/brands/elevenlabs-io
- **ElevenLabs** — secondary #f41a2f (Δ 1.01) — https://brandsweets.com/colors/brands/elevenlabs-io
- **Mattel** — secondary #ee0024 (Δ 1.546) — https://brandsweets.com/colors/brands/mattel-com
- **Tinder** — secondary #ec180e (Δ 1.698) — https://brandsweets.com/colors/brands/tinder-com
- **Vercel** — danger #ee0000 (Δ 1.816) — https://brandsweets.com/colors/brands/vercel
- **LG** — secondary #ea1917 (Δ 1.884) — https://brandsweets.com/colors/brands/lg-com
- **native Cybersecurity** — primary #fc0404 (Δ 1.906) — https://brandsweets.com/colors/brands/crowdstrike-com
- **Pizza Hut** — secondary #e91c24 (Δ 1.924) — https://brandsweets.com/colors/brands/pizzahut-com
- **Pizza Hut** — primary #ee3124 (Δ 1.99) — https://brandsweets.com/colors/brands/pizzahut-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/f31621-c49f9c-62cb93-2d251f-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: "#f31621" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.