# #1b28bb

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

## Values

- Hex: `#1b28bb`
- RGB: rgb(27, 40, 187)
- HSL: hsl(235, 75%, 42%)
- OKLCH: oklch(0.397 0.222 267.7)
- Relative luminance: 0.0534
- Nearest named color: Blue Hour (#0034ab, Δ 3.255) — https://brandsweets.com/colors/blue-hour
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/1b28bb

## Tints & shades

- Tints (toward white): #1f2ed6, #2d3ce1, #4855e5, #5e6ae8, #7983ec, #949cf0, #aab0f3, #c5c9f7, #dbdefa, #f6f7fe
- Shades (toward black): #1824aa, #162198, #141e8a, #111a78, #0f1667, #0c1255, #0a0e43, #080b36, #050824, #030412

## Harmonies

- Complementary: #bbae1b
- Analogous: #1b78bb, #5e1bbb
- Triadic: #bb1b28, #28bb1b
- Split-complementary: #bb5e1b, #78bb1b
- Tetradic: #bb1b78, #bbae1b, #1bbb5e

## Colors that go with #1b28bb

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 #1b28bb: softer than #000 and cool enough to feel like part of the same palette. Seen in: dbt Labs (https://brandsweets.com/colors/brands/getdbt-com), HP (https://brandsweets.com/colors/brands/hp-com), Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), Jeep (https://brandsweets.com/colors/brands/jeep-com). — https://brandsweets.com/colors/charcoal
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #1b28bb's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Glacier (https://brandsweets.com/palettes/cool#glacier), FedEx (https://brandsweets.com/colors/brands/fedex-com). — https://brandsweets.com/colors/steelblue
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #1b28bb: 6 real palettes, including Blue Mono and Qualcomm's brand system, as the supporting colour. Seen in: Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Canva (https://brandsweets.com/colors/brands/canva-com), Spotify (https://brandsweets.com/colors/brands/spotify). — https://brandsweets.com/colors/cornflowerblue
- **Crimson** #dc143c [pool] — Crimson is paired with #1b28bb in 6 real palettes, including Behance's brand system and Pepsi's brand system, as the accent. Seen in: Behance (https://brandsweets.com/colors/brands/behance-net), Pepsi (https://brandsweets.com/colors/brands/pepsi-com), Dunkin' (https://brandsweets.com/colors/brands/dunkindonuts-com), Tim Hortons (https://brandsweets.com/colors/brands/timhortons-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #1b28bb: 8 real palettes, including Unilever's brand system and Warbyparker's brand system, as the accent. Seen in: Unilever (https://brandsweets.com/colors/brands/unilever-com), Warbyparker (https://brandsweets.com/colors/brands/warbyparker-com), Intel (https://brandsweets.com/colors/brands/intel-com), Pixar (https://brandsweets.com/colors/brands/pixar-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #1b28bb: 6 real palettes, including Absolut's brand system and Cargo's brand system, as the supporting colour. Seen in: Absolut (https://brandsweets.com/colors/brands/absolut-com), Cargo (https://brandsweets.com/colors/brands/cargo-site), Readymag (https://brandsweets.com/colors/brands/readymag-com), Samsung (https://brandsweets.com/colors/brands/samsung-com). — https://brandsweets.com/colors/dodgerblue
- **Medium Sea Green** #3cb371 [pool] — Medium Sea Green is paired with #1b28bb in 4 real palettes, including Fintech Trust and Spotify's brand system, as the accent. Seen in: Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Spotify (https://brandsweets.com/colors/brands/spotify), Unity (https://brandsweets.com/colors/brands/unity-com), Indigo SaaS (https://brandsweets.com/palettes/modern#indigo-saas). — https://brandsweets.com/colors/mediumseagreen
- **Midnight Blue** #191970 [pool] — 10 real palettes, including Blue Mono and Air France's brand system put Midnight Blue beside #1b28bb, as that palette's text colour. Seen in: Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Air France (https://brandsweets.com/colors/brands/airfrance-com), MLB (https://brandsweets.com/colors/brands/mlb-com), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com). — https://brandsweets.com/colors/midnightblue

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

- On white (#ffffff): 10.16:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.07:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #5e6ae8 (4.7:1); AA: background → #adadad (4.53:1); AAA: text → #878fee (7.19:1); AAA: background → #d9d9d9 (7.2:1)

## 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/1b28bb-9e9cc4-df8d4e-241f2d-e9eef1?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: "#1b28bb" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.