# #273f77

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

## Values

- Hex: `#273f77`
- RGB: rgb(39, 63, 119)
- HSL: hsl(222, 51%, 31%)
- OKLCH: oklch(0.38 0.1 264.6)
- Relative luminance: 0.0532
- Nearest named color: Aegean Blue (#1b416f, Δ 2.01) — https://brandsweets.com/colors/aegean-blue
- Moods: cool, modern
- Page: https://brandsweets.com/colors/273f77

## Tints & shades

- Tints (toward white): #2f4d92, #3759a9, #4269c2, #5d7ecb, #7894d3, #8fa6db, #aabbe4, #c5d1ec, #dce3f4, #f7f9fd
- Shades (toward black): #23396c, #203564, #1d2f59, #19294d, #162545, #131e3a, #0f182e, #0b1223, #090e1b, #05080f

## Harmonies

- Complementary: #775f27
- Analogous: #276777, #372777
- Triadic: #77273f, #3f7727
- Split-complementary: #773727, #677727
- Tetradic: #772767, #775f27, #277737

## Colors that go with #273f77

Named partners (harmony on the OKLCH wheel, co-occurrence in curated palettes and brand systems, and the neutrals that carry it), best first:

- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #273f77's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Glacier (https://brandsweets.com/palettes/cool#glacier), Plaid (https://brandsweets.com/colors/brands/plaid-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Auth0 (https://brandsweets.com/colors/brands/auth0-com). — https://brandsweets.com/colors/steelblue
- **Blue** #0000ff [pool] — 5 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #273f77, as the accent. Seen in: Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Procter & Gamble (https://brandsweets.com/colors/brands/pg-com), Tesco (https://brandsweets.com/colors/brands/tesco-com). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #273f77 in 9 real palettes, including Marvel's brand system and Casper Sleep's brand system, as the accent. Seen in: Marvel (https://brandsweets.com/colors/brands/marvel-com), Casper Sleep (https://brandsweets.com/colors/brands/casper-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), Walgreens (https://brandsweets.com/colors/brands/walgreens-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #273f77: 20 real palettes, including Hasbro's brand system and Hinge's brand system, as the supporting colour. Seen in: Hasbro (https://brandsweets.com/colors/brands/hasbro-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Starlink (https://brandsweets.com/colors/brands/starlink-com). — https://brandsweets.com/colors/denim
- **Light Sea Green** #20b2aa [pool] — Light Sea Green shows up next to #273f77 in 5 real palettes, including Confluent's brand system and Lagoon, as the accent. Seen in: Confluent (https://brandsweets.com/colors/brands/confluent-io), Lagoon (https://brandsweets.com/palettes/vivid#lagoon), Lido (https://brandsweets.com/palettes/vivid#lido), N26 (https://brandsweets.com/colors/brands/n26-com). — https://brandsweets.com/colors/lightseagreen
- **Midnight Blue** #191970 [pool] — 14 real palettes, including Microsoft's brand system and First Snow put Midnight Blue beside #273f77, as the accent. Seen in: Microsoft (https://brandsweets.com/colors/brands/microsoft-com), First Snow (https://brandsweets.com/palettes/cool#first-snow), Plaid (https://brandsweets.com/colors/brands/plaid-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/midnightblue
- **Orange Red** #ff4500 [pool] — Orange Red is paired with #273f77 in 5 real palettes, including NASA's brand system and Tumblr's brand system, as the supporting colour. Seen in: NASA (https://brandsweets.com/colors/brands/nasa-gov), Tumblr (https://brandsweets.com/colors/brands/tumblr-com), Tide (https://brandsweets.com/colors/brands/tide-com), HubSpot (https://brandsweets.com/colors/brands/hubspot-com). — https://brandsweets.com/colors/orangered
- **White Smoke** #f5f5f5 [role] — White Smoke is the surface for #273f77: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy. — https://brandsweets.com/colors/whitesmoke

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

- On white (#ffffff): 10.18:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.06:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #4e72c6 (4.55:1); AA: background → #adadad (4.53:1); AAA: text → #7c97d5 (7.24:1); AAA: background → #d6d6d6 (7:1)

## 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/273f77-9ca3c4-df6e4e-211f2d-e9eff1?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: "#273f77" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.