# #51a5cd

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

## Values

- Hex: `#51a5cd`
- RGB: rgb(81, 165, 205)
- HSL: hsl(199, 55%, 56%)
- OKLCH: oklch(0.686 0.1 231.4)
- Relative luminance: 0.3307
- Nearest named color: Cousteau (#55a9d6, Δ 1.636) — https://brandsweets.com/colors/cousteau
- Moods: cool, modern
- Page: https://brandsweets.com/colors/51a5cd

## Tints & shades

- Tints (toward white): #61aed1, #71b6d6, #84c0db, #94c8e0, #a4d0e5, #b4d8e9, #c4e0ee, #d7ebf4, #e7f3f8, #f7fbfd
- Shades (toward black): #3d9bc7, #358db6, #2e7b9e, #286b8a, #225c77, #1d4d63, #173d4f, #102b37, #0a1c24, #050c10

## Harmonies

- Complementary: #cd7851
- Analogous: #51cdb6, #5168cd
- Triadic: #cd51a5, #a5cd51
- Split-complementary: #cd5168, #cdb651
- Tetradic: #b651cd, #cd7851, #68cd51

## Colors that go with #51a5cd

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 #51a5cd: softer than #000 and cool enough to feel like part of the same palette. Seen in: Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), Lido (https://brandsweets.com/palettes/vivid#lido), Lagoon (https://brandsweets.com/palettes/vivid#lagoon), Dusty Blue (https://brandsweets.com/palettes/cool#dusty-blue). — https://brandsweets.com/colors/charcoal
- **Peru** #cd853f [harmony, pool: complementary] — Peru sits directly opposite #51a5cd on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Estate (https://brandsweets.com/palettes/luxury#estate), Paper & Pine (https://brandsweets.com/palettes/minimal#paper-and-pine). — https://brandsweets.com/colors/peru
- **Amber** #ffbf00 [pool] — Amber is paired with #51a5cd in 7 real palettes, including Salesforce's brand system and NBA's brand system, as the accent. Seen in: Salesforce (https://brandsweets.com/colors/brands/salesforce-com), NBA (https://brandsweets.com/colors/brands/nba-com), Blueprint (https://brandsweets.com/palettes/technical#blueprint), Beach Hut (https://brandsweets.com/palettes/light#beach-hut). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 5 real palettes, including Canva's brand system and Warp's brand system put Blue beside #51a5cd, as the accent. Seen in: Canva (https://brandsweets.com/colors/brands/canva-com), Warp (https://brandsweets.com/colors/brands/warp-dev), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Unity (https://brandsweets.com/colors/brands/unity-com). — https://brandsweets.com/colors/blue
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #51a5cd in 4 real palettes, including Elastic's brand system and Learning App, as the lead colour. Seen in: Elastic (https://brandsweets.com/colors/brands/elastic-co), Learning App (https://brandsweets.com/palettes/playful#learning-app), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com), PayPal (https://brandsweets.com/colors/brands/paypal-com). — https://brandsweets.com/colors/darkorange
- **Denim** #1560bd [pool] — Designers have shipped Denim with #51a5cd: 7 real palettes, including Coca-Cola's brand system and Gopro's brand system, as the accent. Seen in: Coca-Cola (https://brandsweets.com/colors/brands/coca-cola-com), Gopro (https://brandsweets.com/colors/brands/gopro-com), Open House (https://brandsweets.com/palettes/clean#open-house), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #51a5cd: 5 real palettes, including Venmo's brand system and Figma's brand system, as the lead colour. Seen in: Venmo (https://brandsweets.com/colors/brands/venmo-com), Figma (https://brandsweets.com/colors/brands/figma), Patreon (https://brandsweets.com/colors/brands/patreon-com), Studio Grey (https://brandsweets.com/palettes/minimal#studio-grey). — https://brandsweets.com/colors/dodgerblue
- **Midnight Blue** #191970 [pool] — 9 real palettes, including Confluent's brand system and SoFi's brand system put Midnight Blue beside #51a5cd, as the lead colour. Seen in: Confluent (https://brandsweets.com/colors/brands/confluent-io), SoFi (https://brandsweets.com/colors/brands/sofi-com), Ford (https://brandsweets.com/colors/brands/ford-com), First Snow (https://brandsweets.com/palettes/cool#first-snow). — https://brandsweets.com/colors/midnightblue

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

- On white (#ffffff): 2.76:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #2f7ea2 (4.54:1); AA: background → #333333 (4.58:1); AAA: text → #245f7b (7:1); AAA: background → #0d0d0d (7.05:1)
- On black (#000000): 7.61:1 — AA pass, AA-large pass, AAA pass

## Fonts for this mood

- 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/51a5cd-9cb3c4-df4e66-1f232d-e9f1f0?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: "#51a5cd" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.