Color
#0b43bc
#0b43bcrgb(11, 67, 188)hsl(221, 89%, 39%)oklch(0.438 0.198 262.8)Colors that go with #0b43bc
Charcoal, Crimson and Steel Blue 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 #0b43bc: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #0b43bc — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
analogousshippedSteel Blue is #0b43bc's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #0b43bc in 6 real palettes, including Walmart's brand system and Warner Bros.'s brand system, as the accent.
Blue #0000ff
shipped6 real palettes, including Zillow's brand system and Procter & Gamble's brand system put Blue beside #0b43bc, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #0b43bc: 7 real palettes, including Blue Mono and Gopro's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #0b43bc: 11 real palettes, including Coursera's brand system and Apple's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #0b43bc: 6 real palettes, including MLB's brand system and 3M's brand system, as the supporting colour.
Real palettes that use #0b43bc
Tints & shades
Harmonies
Contrast
| #0b43bc as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.26:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.54:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #0b43bc as the background.
Brands using this color
Fonts for this mood
#0b43bc 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 #0b43bc and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0b43bc-9ca4c4-df6b4e-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