Glacier
Open in tool →Three blues from ice to deep water on a pale surface — a monochromatic winter set with real depth.
Color
#040b58
#040b58
hex
#040b58rgb
rgb(4, 11, 88)hsl
hsl(235, 91%, 18%)oklch
oklch(0.226 0.132 266.3)Closest name: Interstellar Blue (#001155)Relative luminance 0.0097
Colors that go with #040b58
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 #040b58: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #040b58 — 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 #040b58's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped7 real palettes, including Penpot's brand system and Monzo's brand system put Blue beside #040b58, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #040b58: 6 real palettes, including SoFi's brand system and Arctic, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #040b58: 9 real palettes, including Glacier and Air France's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #040b58: 6 real palettes, including Deep Water and Blueprint, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #040b58: 15 real palettes, including British Airways's brand system and Paramount+'s brand system, as the supporting colour.
Real palettes that use #040b58
Tints & shades
Harmonies
Contrast
| #040b58 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 17.59:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.19:1 | 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 #040b58 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#040b58 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #040b58
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #040b58 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/040b58-9e9cc4-df8d4e-241f2d-e9eef1?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