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
#243f84
#243f84
hex
#243f84rgb
rgb(36, 63, 132)hsl
hsl(223, 57%, 33%)oklch
oklch(0.388 0.121 265.1)Closest name: Evening Magic (#363e7d)Relative luminance 0.056
Colors that go with #243f84
Steel Blue, Blue and Cornflower 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #243f84's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped5 real palettes, including CVS's brand system and Alaska Airlines's brand system put Blue beside #243f84, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #243f84: 4 real palettes, including Blue Mono and Blizzard's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #243f84 in 12 real palettes, including Pepsi's brand system and Walgreens's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #243f84: 15 real palettes, including Unilever's brand system and Hasbro's brand system, as the accent.
Midnight Blue #191970
shipped16 real palettes, including Fintech Trust and Microsoft's brand system put Midnight Blue beside #243f84, as that palette's text colour.
Orange Red #ff4500
shippedOrange Red is paired with #243f84 in 5 real palettes, including NASA's brand system and Tide's brand system, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #243f84: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #243f84
Tints & shades
Harmonies
Contrast
| #243f84 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.91:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.12:1 | 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 #243f84 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
#243f84 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #243f84
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 #243f84 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/243f84-9ca3c4-df704e-211f2d-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