Glacier
Open in tool →Three blues from ice to deep water on a pale surface — a monochromatic winter set with real depth.
Color
#040f58
#040f58
hex
#040f58rgb
rgb(4, 15, 88)hsl
hsl(232, 91%, 18%)oklch
oklch(0.232 0.128 266)Closest name: Interstellar Blue (#001155)Relative luminance 0.0107
Colors that go with #040f58
Charcoal, Sea Green 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 #040f58: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #040f58 — 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 #040f58'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 #040f58, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #040f58: 6 real palettes, including SoFi's brand system and Arctic, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #040f58: 9 real palettes, including Glacier and MLB's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #040f58 in 8 real palettes, including Nintendo's brand system and Casper Sleep's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #040f58: 6 real palettes, including Deep Water and Kraken's brand system, as the lead colour.
Real palettes that use #040f58
Tints & shades
Harmonies
Contrast
| #040f58 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 17.29:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.21:1 | 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 #040f58 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#040f58 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #040f58
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 #040f58 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/040f58-9c9dc4-df864e-231f2d-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