Color
#231b5f
#231b5frgb(35, 27, 95)hsl(247, 56%, 24%)oklch(0.281 0.115 281.3)Colors that go with #231b5f
Charcoal, Steel Blue and Amber 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 #231b5f: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #231b5f's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #231b5f in 5 real palettes, including Southwest Airlines's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped10 real palettes, including Sketch's brand system and Monzo's brand system put Blue beside #231b5f, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #231b5f: 6 real palettes, including SoFi's brand system and Open House, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #231b5f: 8 real palettes, including Blue Mono and Purina Pro Plan's brand system, as the lead colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #231b5f: 6 real palettes, including Blue Mono and Arctic, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #231b5f in 11 real palettes, including Nintendo's brand system and Casper Sleep's brand system, as the supporting colour.
Real palettes that use #231b5f
Tints & shades
Harmonies
Contrast
| #231b5f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 15.07:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.39:1 | 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 #231b5f 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
#231b5f 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 #231b5f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/231b5f-a59cc4-dfaa4e-271f2d-e9ecf1?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