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
#21358c
#21358c
hex
#21358crgb
rgb(33, 53, 140)hsl
hsl(229, 62%, 34%)oklch
oklch(0.372 0.146 268.3)Closest name: Deep Space Royal (#223382)Relative luminance 0.0476
Colors that go with #21358c
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 #21358c: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #21358c'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 Procter & Gamble's brand system and CVS's brand system put Blue beside #21358c, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #21358c in 10 real palettes, including Casper Sleep's brand system and Walgreens's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21358c: 14 real palettes, including Warbyparker's brand system and Unilever's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #21358c: 4 real palettes, including Nintendo's brand system and 3M's brand system, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #21358c in 4 real palettes, including Tide's brand system and NASA's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21358c in 11 real palettes, including Nokia's brand system and Nivea's brand system, as the supporting colour.
Real palettes that use #21358c
Tints & shades
Harmonies
Contrast
| #21358c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.75:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.95:1 | 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 #21358c as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#21358c reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21358c
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 #21358c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21358c-9c9fc4-df7e4e-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