# #51fbfb

A color — cool, vivid, technical, modern. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#51fbfb`
- RGB: rgb(81, 251, 251)
- HSL: hsl(180, 96%, 65%)
- OKLCH: oklch(0.904 0.136 195)
- Relative luminance: 0.7771
- Nearest named color: Arctic Water (#00fcfc, Δ 1.834) — https://brandsweets.com/colors/arctic-water
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/51fbfb

## Tints & shades

- Tints (toward white): #5ffcfc, #73fcfc, #82fcfc, #91fdfd, #a5fdfd, #b4fdfd, #c3fefe, #d2fefe, #e6fefe, #f5ffff
- Shades (toward black): #32fbfb, #14fafa, #05ebeb, #04cdcd, #04afaf, #038c8c, #026e6e, #025050, #013232, #001414

## Harmonies

- Complementary: #fb5050
- Analogous: #50fba6, #50a6fb
- Triadic: #fb50fb, #fbfb50
- Split-complementary: #fb50a6, #fba650
- Tetradic: #a650fb, #fb5050, #a6fb50

## Colors that go with #51fbfb

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 text near-black for #51fbfb: softer than #000 and cool enough to feel like part of the same palette. Seen in: Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), UEFA (https://brandsweets.com/colors/brands/uefa-com), Boeing (https://brandsweets.com/colors/brands/boeing-com), Vimeo (https://brandsweets.com/colors/brands/vimeo-com). — https://brandsweets.com/colors/charcoal
- **Deep Sky Blue** #00bfff [harmony, pool: analogous] — Deep Sky Blue is #51fbfb's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Astro (https://brandsweets.com/colors/brands/astro-build), Salesforce (https://brandsweets.com/colors/brands/salesforce-com), Deep Water (https://brandsweets.com/palettes/dark#deep-water), Calendly (https://brandsweets.com/colors/brands/calendly-com). — https://brandsweets.com/colors/deepskyblue
- **Taupe** #483c32 [pool] — Taupe is paired with #51fbfb in 6 real palettes, including Astro's brand system and Mint Chip, as the text colour against it. Seen in: Astro (https://brandsweets.com/colors/brands/astro-build), Mint Chip (https://brandsweets.com/palettes/light#mint-chip), Macaron (https://brandsweets.com/palettes/light#macaron), Nursery (https://brandsweets.com/palettes/light#nursery). — https://brandsweets.com/colors/taupe
- **Light Coral** #f08080 [harmony: complementary] — Light Coral sits directly opposite #51fbfb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. — https://brandsweets.com/colors/lightcoral
- **Crimson** #dc143c [pool] — Crimson is paired with #51fbfb in 3 real palettes, including Formula 1's brand system and Tiffany & Co.'s brand system, as the supporting colour. Seen in: Formula 1 (https://brandsweets.com/colors/brands/formula1-com), Tiffany & Co. (https://brandsweets.com/colors/brands/tiffany-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember). — https://brandsweets.com/colors/crimson
- **Light Pink** #ffb6c1 [pool] — Light Pink shows up next to #51fbfb in 3 real palettes, including Macaron and Sorbet, as the lead colour. Seen in: Macaron (https://brandsweets.com/palettes/light#macaron), Sorbet (https://brandsweets.com/palettes/light#sorbet), Pastel Pop (https://brandsweets.com/palettes/playful#pastel-pop). — https://brandsweets.com/colors/lightpink
- **Steel Blue** #4682b4 [pool] — Designers have shipped Steel Blue with #51fbfb: 3 real palettes, including Astro's brand system and Glacier, as the lead colour. Seen in: Astro (https://brandsweets.com/colors/brands/astro-build), Glacier (https://brandsweets.com/palettes/cool#glacier), Deep Water (https://brandsweets.com/palettes/dark#deep-water). — https://brandsweets.com/colors/steelblue
- **Coral** #ff7f50 [harmony: split] — Coral is a split-complement of #51fbfb: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/coral

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

- On white (#ffffff): 1.27:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #038282 (4.65:1); AA: background → #666666 (4.52:1); AAA: text → #025f5f (7.49:1); AAA: background → #474747 (7.32:1)
- On black (#000000): 16.54:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **Bluesky Social** — accent #00ffff (Δ 1.873) — https://brandsweets.com/colors/brands/bsky-app

## Fonts for this mood

- technical: https://brandsweets.com/fonts/mood/technical
- modern: https://brandsweets.com/fonts/mood/modern

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/51fbfb-a2bbbe-d45994-1f272d-e9f1ed?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: "#51fbfb" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.