Sapphire & Gold
Open in tool →Deep sapphire and gold with a teal — old-money jewel tones on an ivory ground; heraldic without a crest.
Color
#243a8a
#243a8a
hex
#243a8argb
rgb(36, 58, 138)hsl
hsl(227, 59%, 34%)oklch
oklch(0.382 0.136 267.7)Closest name: Deep Space Royal (#223382)Relative luminance 0.0524
Colors that go with #243a8a
Charcoal, Steel Blue and 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 #243a8a: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #243a8a's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shippedBlue is paired with #243a8a in 4 real palettes, including Procter & Gamble's brand system and CVS's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Cornflower Blue #6495ed
shippedCornflower Blue is paired with #243a8a in 4 real palettes, including Blue Mono and Peacock's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Crimson #dc143c
shippedCrimson is paired with #243a8a in 9 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Denim #1560bd
shippedDenim is paired with #243a8a in 11 real palettes, including Hasbro's brand system and General Mills's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Royal Blue #4169e1
shippedRoyal Blue is paired with #243a8a in 10 real palettes, including Nivea's brand system and Carrefour's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Taupe #483c32
shippedTaupe is paired with #243a8a in 5 real palettes, including Gillette's brand system and Boeing's brand system, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #243a8a
Tints & shades
Harmonies
Contrast
| #243a8a as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.26:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.05:1 | 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 #243a8a as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#243a8a reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #243a8a
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 #243a8a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/243a8a-9ca0c4-df7a4e-221f2d-e9eff1?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