Color
#21458c
#21458crgb(33, 69, 140)hsl(220, 62%, 34%)oklch(0.406 0.125 262.2)Colors that go with #21458c
Charcoal, Sea Green and Steel 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 #21458c: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #21458c — 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 #21458c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped6 real palettes, including CVS's brand system and Procter & Gamble's brand system put Blue beside #21458c, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #21458c: 5 real palettes, including Blue Mono and Gopro's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #21458c in 11 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #21458c: 14 real palettes, including Warbyparker's brand system and General Mills's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #21458c: 4 real palettes, including Nintendo's brand system and Campbell's's brand system, as the accent.
Real palettes that use #21458c
Tints & shades
Harmonies
Contrast
| #21458c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.15:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.29:1 | 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 #21458c as the background.
Brands using this color
Fonts for this mood
#21458c reads as cool, vivid, technical. 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 #21458c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21458c-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