Color
#243a66
#243a66rgb(36, 58, 102)hsl(220, 48%, 27%)oklch(0.354 0.082 262.9)Colors that go with #243a66
Sea Green, Steel 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.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #243a66 — 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 #243a66'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 #243a66 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped12 real palettes, including Alaska Airlines's brand system and Jeep's brand system put Blue beside #243a66, as the accent.
Blush Pink #e8b4b8
shipped4 real palettes, including Garden Wedding and Rain Garden put Blush Pink beside #243a66, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #243a66: 6 real palettes, including Open House and Coastal, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #243a66: 4 real palettes, including Blue Mono and Purina Pro Plan's brand system, as the lead colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #243a66: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #243a66
Tints & shades
Harmonies
Contrast
| #243a66 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.22:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.87:1 | 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 #243a66 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#243a66 reads as cool, dark, luxury. 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 #243a66 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/243a66-9ca5c4-df694e-211f2d-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