# #3901df

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

## Values

- Hex: `#3901df`
- RGB: rgb(57, 1, 223)
- HSL: hsl(255, 99%, 44%)
- OKLCH: oklch(0.43 0.271 274.5)
- Relative luminance: 0.0622
- Nearest named color: Busty Blue (#3300cc, Δ 3.316) — https://brandsweets.com/colors/busty-blue
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/3901df

## Tints & shades

- Tints (toward white): #3f01f9, #531bfe, #6734fe, #7d52fe, #906cfe, #a485fe, #baa4ff, #cdbdff, #e4dbff, #f7f5ff
- Shades (toward black): #3401cb, #2e01b7, #2901a2, #24018e, #1f017a, #1a0165, #150051, #0f003d, #0a0029, #050014

## Harmonies

- Complementary: #a8df01
- Analogous: #0139df, #a801df
- Triadic: #df3901, #01df39
- Split-complementary: #dfa801, #39df01
- Tetradic: #df0139, #a8df01, #01dfa8

## Colors that go with #3901df

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 #3901df: softer than #000 and cool enough to feel like part of the same palette. Seen in: Alaska Airlines (https://brandsweets.com/colors/brands/alaskaair-com), Jeep (https://brandsweets.com/colors/brands/jeep-com), HP (https://brandsweets.com/colors/brands/hp-com), Campus (https://brandsweets.com/palettes/friendly#campus). — https://brandsweets.com/colors/charcoal
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #3901df: 8 real palettes, including Unilever's brand system and CVS's brand system, as the supporting colour. Seen in: Unilever (https://brandsweets.com/colors/brands/unilever-com), CVS (https://brandsweets.com/colors/brands/cvs-com), Procter & Gamble (https://brandsweets.com/colors/brands/pg-com), Tesco (https://brandsweets.com/colors/brands/tesco-com). — https://brandsweets.com/colors/cobalt
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #3901df: 4 real palettes, including Qualcomm's brand system and Canva's brand system, as the supporting colour. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Canva (https://brandsweets.com/colors/brands/canva-com), Spotify (https://brandsweets.com/colors/brands/spotify), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono). — https://brandsweets.com/colors/cornflowerblue
- **Crimson** #dc143c [pool] — Crimson is paired with #3901df in 4 real palettes, including Dunkin''s brand system and Tim Hortons's brand system, as the accent. Seen in: Dunkin' (https://brandsweets.com/colors/brands/dunkindonuts-com), Tim Hortons (https://brandsweets.com/colors/brands/timhortons-com), Behance (https://brandsweets.com/colors/brands/behance-net), Coinbase (https://brandsweets.com/colors/brands/coinbase). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #3901df: 5 real palettes, including Unilever's brand system and Activision's brand system, as the accent. Seen in: Unilever (https://brandsweets.com/colors/brands/unilever-com), Activision (https://brandsweets.com/colors/brands/activision-com), Pixar (https://brandsweets.com/colors/brands/pixar-com), Intel (https://brandsweets.com/colors/brands/intel-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #3901df: 6 real palettes, including Cargo's brand system and Readymag's brand system, as the lead colour. Seen in: Cargo (https://brandsweets.com/colors/brands/cargo-site), Readymag (https://brandsweets.com/colors/brands/readymag-com), Samsung (https://brandsweets.com/colors/brands/samsung-com), Unity (https://brandsweets.com/colors/brands/unity-com). — https://brandsweets.com/colors/dodgerblue
- **Midnight Blue** #191970 [pool] — 9 real palettes, including Monzo's brand system and Sketch's brand system put Midnight Blue beside #3901df, as the lead colour. Seen in: Monzo (https://brandsweets.com/colors/brands/monzo-com), Sketch (https://brandsweets.com/colors/brands/sketch-com), MLB (https://brandsweets.com/colors/brands/mlb-com), Purina Pro Plan (https://brandsweets.com/colors/brands/chewy-com). — https://brandsweets.com/colors/midnightblue
- **Sea Green** #2e8b57 [harmony, pool: triadic] — Sea Green completes a triad with #3901df — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Kia (https://brandsweets.com/colors/brands/kia-com), Intel (https://brandsweets.com/colors/brands/intel-com), Coinbase (https://brandsweets.com/colors/brands/coinbase). — https://brandsweets.com/colors/seagreen

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

- On white (#ffffff): 9.36:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.24:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #7d52fe (4.51:1); AA: background → #b5b5b5 (4.56:1); AAA: text → #a080fe (7.01:1); AAA: background → #e0e0e0 (7.09:1)

## 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/3901df-ab9cc4-dfbd4e-291f2d-e9ebf1?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: "#3901df" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.