# #fb4b37

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

## Values

- Hex: `#fb4b37`
- RGB: rgb(251, 75, 55)
- HSL: hsl(6, 96%, 60%)
- OKLCH: oklch(0.662 0.215 30.2)
- Relative luminance: 0.2582
- Nearest named color: Angry Flamingo (#f04e45, Δ 2.294) — https://brandsweets.com/colors/angry-flamingo
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/fb4b37

## Tints & shades

- Tints (toward white): #fb5d4b, #fc6f5f, #fc7c6e, #fc8e82, #fda096, #fdb2aa, #fec4be, #fed2cd, #fee4e1, #fff6f5
- Shades (toward black): #fa3019, #f51d05, #d71904, #be1604, #a01303, #820f03, #690c02, #4b0902, #320601, #140200

## Harmonies

- Complementary: #37e7fb
- Analogous: #fb3785, #fbad37
- Triadic: #37fb4b, #4b37fb
- Split-complementary: #37fbad, #3785fb
- Tetradic: #85fb37, #37e7fb, #ad37fb

## Colors that go with #fb4b37

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 #fb4b37: 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), HubSpot (https://brandsweets.com/colors/brands/hubspot-com), dbt Labs (https://brandsweets.com/colors/brands/getdbt-com). — https://brandsweets.com/colors/charcoal
- **Cadet Blue** #5f9ea0 [harmony, pool: complementary] — Cadet Blue sits directly opposite #fb4b37 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). — https://brandsweets.com/colors/cadetblue
- **Amber** #ffbf00 [pool] — Amber is paired with #fb4b37 in 8 real palettes, including Heatwave and Google's brand system, as the supporting colour. Seen in: Heatwave (https://brandsweets.com/palettes/warm#heatwave), Google (https://brandsweets.com/colors/brands/google-com), Ember (https://brandsweets.com/palettes/bold#ember), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 8 real palettes, including Monzo's brand system and Glossier's brand system put Blue beside #fb4b37, 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 #fb4b37: 4 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), Cobalt Pop (https://brandsweets.com/palettes/bold#cobalt-pop). — https://brandsweets.com/colors/cobalt
- **Denim** #1560bd [pool] — Designers have shipped Denim with #fb4b37: 14 real palettes, including Strava's brand system and Soundcloud's brand system, as the accent. Seen in: Strava (https://brandsweets.com/colors/brands/strava-com), Soundcloud (https://brandsweets.com/colors/brands/soundcloud-com), PlanetScale (https://brandsweets.com/colors/brands/planetscale-com), Etsy (https://brandsweets.com/colors/brands/etsy-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #fb4b37: 7 real palettes, including Figma's brand system and Heatwave, as the accent. Seen in: Figma (https://brandsweets.com/colors/brands/figma), Heatwave (https://brandsweets.com/palettes/warm#heatwave), Databricks (https://brandsweets.com/colors/brands/databricks-com), Readymag (https://brandsweets.com/colors/brands/readymag-com). — https://brandsweets.com/colors/dodgerblue
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #fb4b37: 7 real palettes, including Ember and 3M's brand system, as the supporting colour. Seen in: Ember (https://brandsweets.com/palettes/bold#ember), 3M (https://brandsweets.com/colors/brands/3m-com), Nintendo (https://brandsweets.com/colors/brands/nintendo-com), Vodafone (https://brandsweets.com/colors/brands/vodafone-com). — https://brandsweets.com/colors/firebrick

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

- On white (#ffffff): 3.41:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #e61b05 (4.64:1); AA: background → #242424 (4.56:1); AAA: text → #af1504 (7.16:1)
- On black (#000000): 6.16:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #fc6655 (7.17:1)

## Brands using this color

- **Tumblr** — accent #ff4930 (Δ 0.843) — https://brandsweets.com/colors/brands/tumblr-com
- **Monzo** — secondary #ff4f40 (Δ 1.238) — https://brandsweets.com/colors/brands/monzo-com
- **NASA** — accent #f64137 (Δ 1.931) — https://brandsweets.com/colors/brands/nasa-gov
- **NASA** — secondary #fc3d21 (Δ 1.955) — https://brandsweets.com/colors/brands/nasa-gov

## Curated palettes containing it

- **Streetwear** (bold, vivid, dark) — #ff3b30, #ffffff, #ffe600, #0a0a0a — Black, white, red, yellow — drop-culture signal colors, unmissable at thumbnail size. — tool: https://brandsweets.com/palettes/new/ff3b30-ffffff-ffe600-0a0a0a — collection: https://brandsweets.com/palettes/bold

## 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/fb4b37-c4a59c-62cba3-2d271f-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: "#fb4b37" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.