# #278bd3

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

## Values

- Hex: `#278bd3`
- RGB: rgb(39, 139, 211)
- HSL: hsl(205, 69%, 49%)
- OKLCH: oklch(0.616 0.14 245.4)
- Relative luminance: 0.236
- Nearest named color: Blue Jay (#5588dd, Δ 3.876) — https://brandsweets.com/colors/blue-jay
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/278bd3

## Tints & shades

- Tints (toward white): #3997db, #4ea2df, #64aee3, #79b9e6, #8fc4ea, #a0cdee, #b6d9f2, #cbe4f6, #e1eff9, #f6fafd
- Shades (toward black): #2480c2, #2072ac, #1c669b, #195886, #154d74, #113f5f, #0e334e, #0a2538, #071a27, #030b11

## Harmonies

- Complementary: #d36f27
- Analogous: #27d3c5, #2735d3
- Triadic: #d3278b, #8bd327
- Split-complementary: #d32735, #d3c527
- Tetradic: #c527d3, #d36f27, #35d327

## Colors that go with #278bd3

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 #278bd3: softer than #000 and cool enough to feel like part of the same palette. Seen in: Auth0 (https://brandsweets.com/colors/brands/auth0-com), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Disney (https://brandsweets.com/colors/brands/disney-com), Plaid (https://brandsweets.com/colors/brands/plaid-com). — https://brandsweets.com/colors/charcoal
- **Orange Red** #ff4500 [harmony, pool: split] — Orange Red is a split-complement of #278bd3: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Substack (https://brandsweets.com/colors/brands/substack-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Google (https://brandsweets.com/colors/brands/google-com), Launch Orange (https://brandsweets.com/palettes/bold#launch-orange). — https://brandsweets.com/colors/orangered
- **Copper** #b87333 [harmony, pool: complementary] — Copper sits directly opposite #278bd3 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Notion (https://brandsweets.com/colors/brands/notion), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/copper
- **Amber** #ffbf00 [pool] — Amber is paired with #278bd3 in 13 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), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Heatwave (https://brandsweets.com/palettes/warm#heatwave). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 11 real palettes, including Readymag's brand system and Qualcomm's brand system put Blue beside #278bd3, as the supporting colour. Seen in: Readymag (https://brandsweets.com/colors/brands/readymag-com), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Unity (https://brandsweets.com/colors/brands/unity-com), Cargo (https://brandsweets.com/colors/brands/cargo-site). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #278bd3: 10 real palettes, including Hershey's's brand system and Glacier, as the supporting colour. Seen in: Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Glacier (https://brandsweets.com/palettes/cool#glacier), General Mills (https://brandsweets.com/colors/brands/generalmills-com), Intel (https://brandsweets.com/colors/brands/intel-com). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #278bd3 in 12 real palettes, including NASCAR's brand system and State Farm's brand system, as the supporting colour. Seen in: NASCAR (https://brandsweets.com/colors/brands/nascar-com), State Farm (https://brandsweets.com/colors/brands/statefarm-com), Pizza Hut (https://brandsweets.com/colors/brands/pizzahut-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop). — https://brandsweets.com/colors/crimson
- **Deep Pink** #ff1493 [harmony, pool: triadic] — Deep Pink completes a triad with #278bd3 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: JetBrains (https://brandsweets.com/colors/brands/jetbrains-com), Ubisoft (https://brandsweets.com/colors/brands/ubisoft-com), Maybelline (https://brandsweets.com/colors/brands/maybelline-com). — https://brandsweets.com/colors/deeppink

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

- On white (#ffffff): 3.67:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #227ab9 (4.61:1); AA: background → #1c1c1c (4.64:1); AAA: text → #195b8a (7.23:1)
- On black (#000000): 5.72:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #419cdc (7.01:1)

## Brands using this color

- **Telegram** — secondary #318fd3 (Δ 1.339) — https://brandsweets.com/colors/brands/telegram-org
- **Telegram** — accent #0088cc (Δ 1.846) — https://brandsweets.com/colors/brands/telegram-org

## 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/278bd3-9cafc4-df4e58-1f212d-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: "#278bd3" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.