# #f51000

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

## Values

- Hex: `#f51000`
- RGB: rgb(245, 16, 0)
- HSL: hsl(4, 100%, 48%)
- OKLCH: oklch(0.612 0.247 29.8)
- Relative luminance: 0.1978
- Nearest named color: Assassin’s Red (#f60206, Δ 0.496) — https://brandsweets.com/colors/assassins-red
- Moods: warm, vivid, playful, bold
- Page: https://brandsweets.com/colors/f51000

## Tints & shades

- Tints (toward white): #ff1f0f, #ff3729, #ff4f42, #ff675c, #ff7e75, #ff968f, #ffaea8, #ffc6c2, #ffdedb, #fff5f5
- Shades (toward black): #e00f00, #c70d00, #b30c00, #990a00, #850900, #700700, #570600, #420400, #290300, #140100

## Harmonies

- Complementary: #00e4f5
- Analogous: #f5006a, #f58b00
- Triadic: #00f510, #1000f5
- Split-complementary: #00f58b, #006af5
- Tetradic: #6af500, #00e4f5, #8b00f5

## Colors that go with #f51000

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 #f51000: 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 #f51000 — 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), Five Guys (https://brandsweets.com/colors/brands/fiveguys-com), Coinbase (https://brandsweets.com/colors/brands/coinbase), 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 #f51000: 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 #f51000 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 Gap's brand system put Blue beside #f51000, as the accent. Seen in: native Cybersecurity (https://brandsweets.com/colors/brands/crowdstrike-com), Gap (https://brandsweets.com/colors/brands/gap-com), Doordash (https://brandsweets.com/colors/brands/doordash-com), Glossier (https://brandsweets.com/colors/brands/glossier-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #f51000: 4 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 #f51000: 18 real palettes, including L'Oréal's brand system and YouTube's brand system, as the accent. Seen in: L'Oréal (https://brandsweets.com/colors/brands/loreal-com), YouTube (https://brandsweets.com/colors/brands/youtube-com), ElevenLabs (https://brandsweets.com/colors/brands/elevenlabs-io), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #f51000: 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 → #eb1000 (4.56:1); AA: background → #0f0f0f (4.52:1); AAA: text → #b30c00 (7.07:1)
- On black (#000000): 4.96:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #ff6257 (7.14:1)

## Brands using this color

- **native Cybersecurity** — primary #fc0404 (Δ 1.35) — https://brandsweets.com/colors/brands/crowdstrike-com
- **Vercel** — danger #ee0000 (Δ 1.67) — https://brandsweets.com/colors/brands/vercel
- **Tinder** — secondary #ec180e (Δ 1.729) — https://brandsweets.com/colors/brands/tinder-com
- **3M** — primary #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/3m-com
- **Gap** — secondary #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/gap-com
- **Heineken** — accent #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/heineken-com
- **L'Oréal** — secondary #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/loreal-com
- **Logitech** — secondary #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/logitech-com
- **Paddle** — secondary #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/paddle-com
- **YouTube** — primary #ff0000 (Δ 1.907) — https://brandsweets.com/colors/brands/youtube-com
- **Doordash** — secondary #eb1700 (Δ 1.94) — https://brandsweets.com/colors/brands/doordash-com
- **Databricks** — secondary #eb1600 (Δ 1.951) — https://brandsweets.com/colors/brands/databricks-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/f51000-c4a39c-62cb9f-2d261f-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: "#f51000" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.