Frost & Ember
Open in tool →Navy and frost with one ember red — the classic cold-with-a-warm-accent structure, borrowed from a thousand ski posters.
Color
#103451
#103451
hex
#103451rgb
rgb(16, 52, 81)hsl
hsl(207, 67%, 19%)oklch
oklch(0.315 0.066 246.5)Closest name: Beyond the Stars (#0a3251)Relative luminance 0.0316
Colors that go with #103451
Crimson, Royal Blue and Sienna 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.
Crimson #dc143c
triadicshippedCrimson completes a triad with #103451 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Royal Blue #4169e1
analogousshippedRoyal Blue is #103451's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #103451 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Teal #008080
analogousshippedTeal is #103451'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 #103451 in 7 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped14 real palettes, including Alaska Airlines's brand system and Monzo's brand system put Blue beside #103451, as the accent.
Blush Pink #e8b4b8
shipped5 real palettes, including Rain Garden and Garden Wedding put Blush Pink beside #103451, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #103451: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #103451
Tints & shades
Harmonies
Contrast
| #103451 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 12.87:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.63:1 | 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 #103451 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#103451 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #103451
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 #103451 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/103451-9cadc4-df4e53-1f212d-e9f1f1?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