Color
#0b3bcb
#0b3bcbrgb(11, 59, 203)hsl(225, 90%, 42%)oklch(0.439 0.225 264.1)Colors that go with #0b3bcb
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 #0b3bcb: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #0b3bcb — 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 #0b3bcb'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 #0b3bcb in 5 real palettes, including Walmart's brand system and Binance's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #0b3bcb: 8 real palettes, including Blue Mono and Qualcomm's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #0b3bcb: 10 real palettes, including Coursera's brand system and Cargo's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #0b3bcb: 5 real palettes, including 3M's brand system and MLB's brand system, as the supporting colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #0b3bcb in 7 real palettes, including Spotify's brand system and Indigo SaaS, as the lead colour.
Real palettes that use #0b3bcb
Tints & shades
Harmonies
Contrast
| #0b3bcb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.39:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.5:1 | 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 #0b3bcb as the background.
Brands using this color
Fonts for this mood
#0b3bcb 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 #0b3bcb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0b3bcb-9ca1c4-df754e-221f2d-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