# #3b105b

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

## Values

- Hex: `#3b105b`
- RGB: rgb(59, 16, 91)
- HSL: hsl(274, 70%, 21%)
- OKLCH: oklch(0.29 0.125 305.8)
- Relative luminance: 0.0206
- Nearest named color: Fabric of Space (#341758, Δ 1.924) — https://brandsweets.com/colors/fabric-of-space
- Moods: cool, vivid, dark, technical, modern, luxury, bold
- Page: https://brandsweets.com/colors/3b105b

## Tints & shades

- Tints (toward white): #51167e, #641c9c, #7b22bf, #902fda, #a352e0, #b370e6, #c593ec, #d8b5f2, #e8d4f7, #faf6fd
- Shades (toward black): #350f52, #320e4e, #2d0c45, #270b3d, #240a38, #1f0830, #190727, #14051e, #11051a, #0b0311

## Harmonies

- Complementary: #315b10
- Analogous: #15105b, #5b1056
- Triadic: #5b3b10, #105b3b
- Split-complementary: #565b10, #105b15
- Tetradic: #5b1510, #315b10, #10565b

## Colors that go with #3b105b

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 #3b105b: softer than #000 and cool enough to feel like part of the same palette. Seen in: Microsoft (https://brandsweets.com/colors/brands/microsoft-com), Plaid (https://brandsweets.com/colors/brands/plaid-com), CeraVe (https://brandsweets.com/colors/brands/cerave-com), Hinge (https://brandsweets.com/colors/brands/hinge-co). — https://brandsweets.com/colors/charcoal
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #3b105b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Discord (https://brandsweets.com/colors/brands/discord), Telehealth (https://brandsweets.com/palettes/modern#telehealth), Confluent (https://brandsweets.com/colors/brands/confluent-io), GEICO (https://brandsweets.com/colors/brands/geico-com). — https://brandsweets.com/colors/royalblue
- **Cadet Blue** #5f9ea0 [pool] — Designers have shipped Cadet Blue with #3b105b: 4 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), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/cadetblue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #3b105b: 5 real palettes, including Blue Mono and Purina Pro Plan's brand system, as the lead colour. Seen in: Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com), MLB (https://brandsweets.com/colors/brands/mlb-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #3b105b in 4 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour. Seen in: Casper Sleep (https://brandsweets.com/colors/brands/casper-com), Marvel (https://brandsweets.com/colors/brands/marvel-com), Nintendo (https://brandsweets.com/colors/brands/nintendo-com), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #3b105b: 13 real palettes, including Discover's brand system and Bank of America's brand system, as the supporting colour. Seen in: Discover (https://brandsweets.com/colors/brands/discover-com), Bank of America (https://brandsweets.com/colors/brands/bankofamerica-com), Panasonic (https://brandsweets.com/colors/brands/panasonic-com), Open House (https://brandsweets.com/palettes/clean#open-house). — https://brandsweets.com/colors/denim
- **Light Pink** #ffb6c1 [pool] — Light Pink shows up next to #3b105b in 4 real palettes, including Railway's brand system and Sorbet, as the supporting colour. Seen in: Railway (https://brandsweets.com/colors/brands/railway-app), Sorbet (https://brandsweets.com/palettes/light#sorbet), Pastel Pop (https://brandsweets.com/palettes/playful#pastel-pop), Macaron (https://brandsweets.com/palettes/light#macaron). — https://brandsweets.com/colors/lightpink
- **Powder Blue** #b0e0e6 [pool] — Designers have shipped Powder Blue with #3b105b: 6 real palettes, including First Snow and Frost & Ember, as the accent. Seen in: First Snow (https://brandsweets.com/palettes/cool#first-snow), Frost & Ember (https://brandsweets.com/palettes/bold#frost-and-ember), Opera (https://brandsweets.com/colors/brands/opera-com), Sorbet (https://brandsweets.com/palettes/light#sorbet). — https://brandsweets.com/colors/powderblue

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

- On white (#ffffff): 14.88:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 1.41:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #a04de0 (4.63:1); AA: background → #8f8f8f (4.6:1); AAA: text → #ba7de8 (7.19:1); AAA: background → #b3b3b3 (7.1:1)

## Brands using this color

- **MetaMask** — secondary #3d065f (Δ 1.456) — https://brandsweets.com/colors/brands/metamask-io

## 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/3b105b-b79cc4-c2cb62-2d1f2d-eae9f1?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: "#3b105b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.