Color
#537ee9
#537ee9rgb(83, 126, 233)hsl(223, 77%, 62%)oklch(0.616 0.168 265.3)Colors that go with #537ee9
Charcoal, Crimson and Amber lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #537ee9: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #537ee9 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #537ee9 in 11 real palettes, including Heatwave and Walmart's brand system, as the supporting colour.
Blue #0000ff
shipped13 real palettes, including Qualcomm's brand system and Readymag's brand system put Blue beside #537ee9, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #537ee9: 8 real palettes, including Carrefour's brand system and Behance's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #537ee9: 8 real palettes, including Patreon's brand system and Astro's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #537ee9: 15 real palettes, including Coursera's brand system and Guinness's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #537ee9: 4 real palettes, including Campbell's's brand system and AT&T's brand system, as the supporting colour.
Real palettes that use #537ee9
Tints & shades
Harmonies
Contrast
| #537ee9 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.8:1 | fail | pass | fail | |
Aaon black | 5.53:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #537ee9 as the background.
Brands using this color
Fonts for this mood
#537ee9 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #537ee9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/537ee9-9ca3c4-df704e-211f2d-e9eff1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md