# darkblue (#00008b)

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

## Values

- Hex: `#00008b`
- RGB: rgb(0, 0, 139)
- HSL: hsl(240, 100%, 27%)
- OKLCH: oklch(0.288 0.199 264.1)
- Relative luminance: 0.0186
- Name: darkblue (`darkblue`, source: css)
- Moods: cool, vivid, dark, technical, modern, luxury, bold
- Page: https://brandsweets.com/colors/darkblue

## Tints & shades

- Tints (toward white): #0000ad, #0000d1, #0000f5, #1a1aff, #4242ff, #6666ff, #8a8aff, #adadff, #d1d1ff, #f5f5ff
- Shades (toward black): #000080, #000070, #000066, #00005c, #000052, #000042, #000038, #00002e, #00001f, #000014

## Harmonies

- Complementary: #8a8a00
- Analogous: #00458a, #45008a
- Triadic: #8a0000, #008a00
- Split-complementary: #8a4500, #458a00
- Tetradic: #8a0045, #8a8a00, #008a45

## Colors that go with darkblue

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 darkblue's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Deep Water (https://brandsweets.com/palettes/dark#deep-water), Glacier (https://brandsweets.com/palettes/cool#glacier), Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/steelblue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with darkblue: 4 real palettes, including Purina Pro Plan's brand system and Tide's brand system, as the accent. Seen in: Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com), Tide (https://brandsweets.com/colors/brands/tide-com), Glacier (https://brandsweets.com/palettes/cool#glacier), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [harmony, pool: triadic] — Crimson completes a triad with darkblue — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Pepsi (https://brandsweets.com/colors/brands/pepsi-com), Nintendo (https://brandsweets.com/colors/brands/nintendo-com), Casper Sleep (https://brandsweets.com/colors/brands/casper-com). — https://brandsweets.com/colors/crimson
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with darkblue in 4 real palettes, including Discord's brand system and Nivea's brand system, as the lead colour. Seen in: Discord (https://brandsweets.com/colors/brands/discord), Nivea (https://brandsweets.com/colors/brands/nivea-com), Confluent (https://brandsweets.com/colors/brands/confluent-io), Spectrum (https://brandsweets.com/colors/brands/spectrum-com). — https://brandsweets.com/colors/royalblue
- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite darkblue 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 darkblue: softer than #000 and cool enough to feel like part of the same palette. Seen in: Boeing (https://brandsweets.com/colors/brands/boeing-com), dbt Labs (https://brandsweets.com/colors/brands/getdbt-com). — https://brandsweets.com/colors/charcoal
- **Orange Red** #ff4500 [pool] — Orange Red is paired with darkblue in 3 real palettes, including Tide's brand system and NASA's brand system, as the accent. Seen in: Tide (https://brandsweets.com/colors/brands/tide-com), NASA (https://brandsweets.com/colors/brands/nasa-gov), Intercom (https://brandsweets.com/colors/brands/intercom-com). — https://brandsweets.com/colors/orangered
- **Sienna** #a0522d [harmony: split] — Sienna is a split-complement of darkblue: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/sienna

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

- On white (#ffffff): 15.3:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.37:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #6161ff (4.66:1); AA: background → #8c8c8c (4.55:1); AAA: text → #8a8aff (7.16:1); AAA: background → #b0b0b0 (7.05:1)

## Brands using this color

- **Boeing** — accent #08088c (Δ 1.332) — https://brandsweets.com/colors/brands/boeing-com

## Fonts for this mood

- technical: https://brandsweets.com/fonts/mood/technical
- modern: https://brandsweets.com/fonts/mood/modern
- luxury: https://brandsweets.com/fonts/mood/luxury
- bold: https://brandsweets.com/fonts/mood/bold

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/00008b-a19cc4-df994e-251f2d-e9edf1?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: "#00008b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.