# #3757f6

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

## Values

- Hex: `#3757f6`
- RGB: rgb(55, 87, 246)
- HSL: hsl(230, 91%, 59%)
- OKLCH: oklch(0.54 0.238 268)
- Relative luminance: 0.1428
- Nearest named color: Bluerocratic (#1f66ff, Δ 3.511) — https://brandsweets.com/colors/bluerocratic
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/3757f6

## Tints & shades

- Tints (toward white): #4b67f7, #5e78f7, #7288f8, #8599f9, #99a9fa, #a7b5fb, #bbc6fc, #ced6fd, #e2e6fe, #f5f7ff
- Shades (toward black): #1f43f4, #0b30ea, #0a2bd1, #0825b4, #07209c, #061a7f, #051566, #030f49, #020a31, #010413

## Harmonies

- Complementary: #f6d637
- Analogous: #37b6f6, #7737f6
- Triadic: #f63757, #57f637
- Split-complementary: #f67737, #b6f637
- Tetradic: #f637b6, #f6d637, #37f677

## Colors that go with #3757f6

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 #3757f6: softer than #000 and cool enough to feel like part of the same palette. Seen in: Docker (https://brandsweets.com/colors/brands/docker-com), Zoom (https://brandsweets.com/colors/brands/zoom-us), Campus (https://brandsweets.com/palettes/friendly#campus), UEFA (https://brandsweets.com/colors/brands/uefa-com). — https://brandsweets.com/colors/charcoal
- **Crimson** #dc143c [harmony, pool: triadic] — Crimson completes a triad with #3757f6 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Toyota (https://brandsweets.com/colors/brands/toyota-com), Chase (https://brandsweets.com/colors/brands/chase-com), Coinbase (https://brandsweets.com/colors/brands/coinbase), WWE (https://brandsweets.com/colors/brands/wwe-com). — https://brandsweets.com/colors/crimson
- **Amber** #ffbf00 [pool] — Amber is paired with #3757f6 in 6 real palettes, including Walmart's brand system and Mastodon hosted on mastodon.social's brand system, as the accent. Seen in: Walmart (https://brandsweets.com/colors/brands/walmart-com), Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social), NBA (https://brandsweets.com/colors/brands/nba-com), Wikipedia (https://brandsweets.com/colors/brands/wikipedia-org). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 9 real palettes, including Signal's brand system and Dropbox's brand system put Blue beside #3757f6, as the supporting colour. Seen in: Signal (https://brandsweets.com/colors/brands/signal-org), Dropbox (https://brandsweets.com/colors/brands/dropbox-com), Headspace (https://brandsweets.com/colors/brands/headspace-com), MongoDB (https://brandsweets.com/colors/brands/mongodb-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #3757f6: 10 real palettes, including Nivea's brand system and Nokia's brand system, as the lead colour. Seen in: Nivea (https://brandsweets.com/colors/brands/nivea-com), Nokia (https://brandsweets.com/colors/brands/nokia-com), NHL (https://brandsweets.com/colors/brands/nhl-com), Behance (https://brandsweets.com/colors/brands/behance-net). — https://brandsweets.com/colors/cobalt
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #3757f6: 7 real palettes, including Roblox's brand system and Webflow's brand system, as the supporting colour. Seen in: Roblox (https://brandsweets.com/colors/brands/roblox-com), Webflow (https://brandsweets.com/colors/brands/webflow-com), Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social), NBA (https://brandsweets.com/colors/brands/nba-com). — https://brandsweets.com/colors/cornflowerblue
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #3757f6: 6 real palettes, including Elastic's brand system and Calm's brand system, as the supporting colour. Seen in: Elastic (https://brandsweets.com/colors/brands/elastic-co), Calm (https://brandsweets.com/colors/brands/calm-com), Warp (https://brandsweets.com/colors/brands/warp-dev), Astro (https://brandsweets.com/colors/brands/astro-build). — https://brandsweets.com/colors/deepskyblue
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #3757f6: 9 real palettes, including OnePlus's brand system and HashiCorp's brand system, as the supporting colour. Seen in: OnePlus (https://brandsweets.com/colors/brands/oneplus-com), HashiCorp (https://brandsweets.com/colors/brands/hashicorp-com), ASUS (https://brandsweets.com/colors/brands/asus-com), Coursera (https://brandsweets.com/colors/brands/coursera-org). — https://brandsweets.com/colors/dodgerblue

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

- On white (#ffffff): 5.45:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #153af4 (7.13:1)
- On black (#000000): 3.86:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #4b67f7 (4.58:1); AA: background → #ebebeb (4.57:1); AAA: text → #7b90f9 (7.2:1)

## Brands using this color

- **Roblox** — primary #345cfc (Δ 1.388) — https://brandsweets.com/colors/brands/roblox-com
- **Signal** — accent #4258ff (Δ 1.84) — https://brandsweets.com/colors/brands/signal-org

## 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/3757f6-9c9ec4-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: "#3757f6" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.