# #311a99

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

## Values

- Hex: `#311a99`
- RGB: rgb(49, 26, 153)
- HSL: hsl(251, 71%, 35%)
- OKLCH: oklch(0.354 0.188 279.1)
- Relative luminance: 0.0369
- Nearest named color: Depths of Night (#2c319b, Δ 4.065) — https://brandsweets.com/colors/depths-of-night
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/311a99

## Tints & shades

- Tints (toward white): #3a1eb3, #4323d1, #5536dd, #6b51e1, #856fe7, #9b89eb, #b1a3ef, #c8bef4, #e1dcf9, #f8f6fe
- Shades (toward black): #2d188c, #29157e, #241371, #201164, #1c0f57, #160c46, #120a39, #0e072c, #0a051f, #060311

## Harmonies

- Complementary: #81991a
- Analogous: #1a4299, #701a99
- Triadic: #99311a, #1a9931
- Split-complementary: #99701a, #42991a
- Tetradic: #991a42, #81991a, #1a9970

## Colors that go with #311a99

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 #311a99'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), FedEx (https://brandsweets.com/colors/brands/fedex-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Glacier (https://brandsweets.com/palettes/cool#glacier). — https://brandsweets.com/colors/steelblue
- **Blue** #0000ff [pool] — 4 real palettes, including Procter & Gamble's brand system and Pfizer's brand system put Blue beside #311a99, as the supporting colour. Seen in: Procter & Gamble (https://brandsweets.com/colors/brands/pg-com), Pfizer (https://brandsweets.com/colors/brands/pfizer-com), Zillow (https://brandsweets.com/colors/brands/zillow-com), CVS (https://brandsweets.com/colors/brands/cvs-com). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #311a99 in 6 real palettes, including Pepsi's brand system and Casper Sleep's brand system, as the supporting colour. Seen in: Pepsi (https://brandsweets.com/colors/brands/pepsi-com), Casper Sleep (https://brandsweets.com/colors/brands/casper-com), Nintendo (https://brandsweets.com/colors/brands/nintendo-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #311a99: 6 real palettes, including Warbyparker's brand system and Unilever's brand system, as the accent. Seen in: Warbyparker (https://brandsweets.com/colors/brands/warbyparker-com), Unilever (https://brandsweets.com/colors/brands/unilever-com), Bank of America (https://brandsweets.com/colors/brands/bankofamerica-com), Panasonic (https://brandsweets.com/colors/brands/panasonic-com). — https://brandsweets.com/colors/denim
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #311a99: 4 real palettes, including Nintendo's brand system and 3M's brand system, as the accent. Seen in: Nintendo (https://brandsweets.com/colors/brands/nintendo-com), 3M (https://brandsweets.com/colors/brands/3m-com), Datadog (https://brandsweets.com/colors/brands/datadoghq-com), MLB (https://brandsweets.com/colors/brands/mlb-com). — https://brandsweets.com/colors/firebrick
- **Red** #ff0000 [pool] — Red is paired with #311a99 in 4 real palettes, including 3M's brand system and Walgreens's brand system, as the lead colour. Seen in: 3M (https://brandsweets.com/colors/brands/3m-com), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Twitch (https://brandsweets.com/colors/brands/twitch-tv), Hyundai (https://brandsweets.com/colors/brands/hyundaiusa-com). — https://brandsweets.com/colors/red
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #311a99 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/olive
- **Charcoal** #36454f [role, pool] — Charcoal is the text near-black for #311a99: 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), Boeing (https://brandsweets.com/colors/brands/boeing-com). — https://brandsweets.com/colors/charcoal

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

- On white (#ffffff): 12.08:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.74:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #7a62e4 (4.69:1); AA: background → #9e9e9e (4.51:1); AAA: text → #9b89eb (7.17:1); AAA: background → #c7c7c7 (7.15:1)

## 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/311a99-a89cc4-dfb34e-281f2d-e9ecf1?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: "#311a99" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.