Cobalt Blue hex code
Cobalt Blue
#0047abrgb(0, 71, 171)hsl(215, 100%, 34%)oklch(0.428 0.172 259.7)Cobalt Blue is a deep, highly saturated blue — #0047ab, rgb(0, 71, 171), hue 215° at 100% saturation. The colours that go with cobalt blue are Charcoal, Crimson and Steel Blue — each with the reason below, and the real palettes that pair them. As text it passes WCAG AA on white at 8.44:1, so it can be a body colour, not just a fill. 2 public brands use it in a role token.
Colors that go with Cobalt Blue
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 Cobalt Blue: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with Cobalt Blue — 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 Cobalt Blue'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 Cobalt Blue in 5 real palettes, including Warner Bros.'s brand system and Walmart's brand system, as the accent.
Blue #0000ff
shipped8 real palettes, including Procter & Gamble's brand system and CVS's brand system put Blue beside Cobalt Blue, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with Cobalt Blue: 5 real palettes, including Blue Mono and Gopro's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with Cobalt Blue: 5 real palettes, including Coursera's brand system and Apple's brand system, as the supporting colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with Cobalt Blue: 5 real palettes, including MLB's brand system and 3M's brand system, as the supporting colour.
Real palettes that use Cobalt Blue
Tints & shades
Harmonies
Contrast
| Cobalt Blue as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 8.44:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.49:1 | 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 Cobalt Blue as the background.
Brands using this color
Fonts for this mood
Cobalt Blue 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 #0047ab and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/0047ab-9ca8c4-df5d4e-201f2d-e9f0f1?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