# #537ef3

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

## Values

- Hex: `#537ef3`
- RGB: rgb(83, 126, 243)
- HSL: hsl(224, 87%, 64%)
- OKLCH: oklch(0.623 0.182 266.1)
- Relative luminance: 0.2323
- Nearest named color: Blue Öyster Cult (#5577ee, Δ 1.796) — https://brandsweets.com/colors/blue-oyster-cult
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/537ef3

## Tints & shades

- Tints (toward white): #6289f4, #7597f5, #83a2f6, #96b0f8, #a4bbf9, #b3c6fa, #c6d4fb, #d4dffc, #e7edfd, #f5f8fe
- Shades (toward black): #3768f1, #1a53ef, #0f46db, #0d3dbf, #0b33a2, #092a86, #072169, #05184c, #030f30, #010613

## Harmonies

- Complementary: #f3c853
- Analogous: #53cef3, #7953f3
- Triadic: #f3537e, #7ef353
- Split-complementary: #f37953, #cef353
- Tetradic: #f353ce, #f3c853, #53f379

## Colors that go with #537ef3

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 #537ef3: softer than #000 and cool enough to feel like part of the same palette. Seen in: Disney (https://brandsweets.com/colors/brands/disney-com), Docker (https://brandsweets.com/colors/brands/docker-com), Zoom (https://brandsweets.com/colors/brands/zoom-us), Plaid (https://brandsweets.com/colors/brands/plaid-com). — https://brandsweets.com/colors/charcoal
- **Red** #ff0000 [harmony, pool: triadic] — Red completes a triad with #537ef3 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Databricks (https://brandsweets.com/colors/brands/databricks-com), Rotten Tomatoes (https://brandsweets.com/colors/brands/rottentomatoes-com), Vercel (https://brandsweets.com/colors/brands/vercel), Pizza Hut (https://brandsweets.com/colors/brands/pizzahut-com). — https://brandsweets.com/colors/red
- **Amber** #ffbf00 [pool] — Amber is paired with #537ef3 in 10 real palettes, including Google's brand system and Heatwave, as the accent. Seen in: Google (https://brandsweets.com/colors/brands/google-com), Heatwave (https://brandsweets.com/palettes/warm#heatwave), Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social), Blueprint (https://brandsweets.com/palettes/technical#blueprint). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 13 real palettes, including Qualcomm's brand system and Readymag's brand system put Blue beside #537ef3, as the accent. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Cargo (https://brandsweets.com/colors/brands/cargo-site), Penpot (https://brandsweets.com/colors/brands/penpot-app). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #537ef3: 10 real palettes, including Carrefour's brand system and Behance's brand system, as the accent. Seen in: Carrefour (https://brandsweets.com/colors/brands/carrefour-com), Behance (https://brandsweets.com/colors/brands/behance-net), Nokia (https://brandsweets.com/colors/brands/nokia-com), Nivea (https://brandsweets.com/colors/brands/nivea-com). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #537ef3 in 11 real palettes, including Behance's brand system and Pizza Hut's brand system, as the accent. Seen in: Behance (https://brandsweets.com/colors/brands/behance-net), Pizza Hut (https://brandsweets.com/colors/brands/pizzahut-com), WWE (https://brandsweets.com/colors/brands/wwe-com), Foot Locker (https://brandsweets.com/colors/brands/footlocker-com). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #537ef3: 10 real palettes, including Patreon's brand system and Venmo's brand system, as the supporting colour. Seen in: Patreon (https://brandsweets.com/colors/brands/patreon-com), Venmo (https://brandsweets.com/colors/brands/venmo-com), Elastic (https://brandsweets.com/colors/brands/elastic-co), Blueprint (https://brandsweets.com/palettes/technical#blueprint). — https://brandsweets.com/colors/deepskyblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #537ef3: 17 real palettes, including Coursera's brand system and Venmo's brand system, as the accent. Seen in: Coursera (https://brandsweets.com/colors/brands/coursera-org), Venmo (https://brandsweets.com/colors/brands/venmo-com), Guinness (https://brandsweets.com/colors/brands/guinness-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com). — https://brandsweets.com/colors/denim

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

- On white (#ffffff): 3.72:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #3b6cf1 (4.56:1); AA: background → #1c1c1c (4.58:1); AAA: text → #1047e0 (7:1)
- On black (#000000): 5.65:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #7093f5 (7.18:1)

## Brands using this color

- **Spline** — primary #4482fc (Δ 1.9) — https://brandsweets.com/colors/brands/spline-design

## 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/537ef3-9ca2c4-df724e-221f2d-e9eff1?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: "#537ef3" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.