# #101d5c

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

## Values

- Hex: `#101d5c`
- RGB: rgb(16, 29, 92)
- HSL: hsl(230, 70%, 21%)
- OKLCH: oklch(0.268 0.113 268.3)
- Relative luminance: 0.0176
- Nearest named color: Dark Soul (#112255, Δ 1.892) — https://brandsweets.com/colors/dark-soul
- Moods: cool, vivid, dark, technical, modern, luxury, bold
- Page: https://brandsweets.com/colors/101d5c

## Tints & shades

- Tints (toward white): #16277e, #1c319c, #223cbf, #2f4bda, #5269e0, #7084e6, #93a1ec, #b5bff2, #d4daf7, #f6f8fd
- Shades (toward black): #0f1a52, #0e184e, #0c1645, #0b133d, #0a1238, #080f30, #070c27, #050a1e, #05081a, #030511

## Harmonies

- Complementary: #5b4f10
- Analogous: #10425b, #29105b
- Triadic: #5b101d, #1d5b10
- Split-complementary: #5b2910, #425b10
- Tetradic: #5b1042, #5b4f10, #105b29

## Colors that go with #101d5c

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 #101d5c: softer than #000 and cool enough to feel like part of the same palette. Seen in: Plaid (https://brandsweets.com/colors/brands/plaid-com), CeraVe (https://brandsweets.com/colors/brands/cerave-com), Microsoft (https://brandsweets.com/colors/brands/microsoft-com), Volkswagen (https://brandsweets.com/colors/brands/vw-com). — https://brandsweets.com/colors/charcoal
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #101d5c — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com), Asana (https://brandsweets.com/colors/brands/asana-com), Subaru (https://brandsweets.com/colors/brands/subaru-com), Intel (https://brandsweets.com/colors/brands/intel-com). — https://brandsweets.com/colors/seagreen
- **Slate Blue** #6a5acd [harmony, pool: analogous] — Slate Blue is #101d5c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Marvel (https://brandsweets.com/colors/brands/marvel-com), Indigo SaaS (https://brandsweets.com/palettes/modern#indigo-saas), Sentry (https://brandsweets.com/colors/brands/sentry-io), Superhuman (https://brandsweets.com/colors/brands/superhuman-com). — https://brandsweets.com/colors/slateblue
- **Steel Blue** #4682b4 [harmony, pool: analogous] — Steel Blue is #101d5c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Plaid (https://brandsweets.com/colors/brands/plaid-com), Deep Water (https://brandsweets.com/palettes/dark#deep-water), Glacier (https://brandsweets.com/palettes/cool#glacier), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/steelblue
- **Amber** #ffbf00 [pool] — Amber is paired with #101d5c in 6 real palettes, including Southwest Airlines's brand system and Beach Hut, as the accent. Seen in: Southwest Airlines (https://brandsweets.com/colors/brands/southwest-com), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Blueprint (https://brandsweets.com/palettes/technical#blueprint), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 11 real palettes, including Monzo's brand system and Penpot's brand system put Blue beside #101d5c, as the accent. Seen in: Monzo (https://brandsweets.com/colors/brands/monzo-com), Penpot (https://brandsweets.com/colors/brands/penpot-app), Sketch (https://brandsweets.com/colors/brands/sketch-com), League of Legends (https://brandsweets.com/colors/brands/leagueoflegends-com). — https://brandsweets.com/colors/blue
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #101d5c: 7 real palettes, including SoFi's brand system and Open House, as the supporting colour. Seen in: SoFi (https://brandsweets.com/colors/brands/sofi-com), Open House (https://brandsweets.com/palettes/clean#open-house), Coastal (https://brandsweets.com/palettes/cool#coastal), Arctic (https://brandsweets.com/palettes/clean#arctic). — https://brandsweets.com/colors/cadetblue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #101d5c: 10 real palettes, including Blue Mono and MLB's brand system, as the lead colour. Seen in: Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), MLB (https://brandsweets.com/colors/brands/mlb-com), Glacier (https://brandsweets.com/palettes/cool#glacier), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com). — https://brandsweets.com/colors/cobalt

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

- On white (#ffffff): 15.53:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.35:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #566de1 (4.67:1); AA: background → #8c8c8c (4.62:1); AAA: text → #8193e9 (7.28:1); AAA: background → #b0b0b0 (7.16:1)

## Brands using this color

- **Crest** — accent #0e1c63 (Δ 1.293) — https://brandsweets.com/colors/brands/crest-com
- **Airbus** — secondary #00205b (Δ 1.532) — https://brandsweets.com/colors/brands/airbus-com
- **Gillette** — secondary #001e60 (Δ 1.61) — https://brandsweets.com/colors/brands/gillette-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/101d5c-9c9ec4-df814e-231f2d-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: "#101d5c" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.