Color
#233f71
#233f71rgb(35, 63, 113)hsl(218, 53%, 29%)oklch(0.373 0.093 261.1)Colors that go with #233f71
Blue, Cadet Blue and Crimson 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.
Blue #0000ff
shipped4 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #233f71, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #233f71: 4 real palettes, including Open House and Coastal, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #233f71 in 7 real palettes, including Marvel's brand system and Casper Sleep's brand system, as the accent.
Denim #1560bd
shippedDesigners have shipped Denim with #233f71: 12 real palettes, including Hasbro's brand system and Hinge's brand system, as the supporting colour.
Light Sea Green #20b2aa
shippedLight Sea Green shows up next to #233f71 in 4 real palettes, including Confluent's brand system and Lagoon, as the accent.
Midnight Blue #191970
shipped11 real palettes, including Microsoft's brand system and Plaid's brand system put Midnight Blue beside #233f71, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #233f71: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Teal #008080
analogousshippedTeal is #233f71's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Real palettes that use #233f71
Tints & shades
Harmonies
Contrast
| #233f71 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.39:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.02:1 | 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 #233f71 as the background.
Brands using this color
Fonts for this mood
#233f71 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 #233f71 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/233f71-9ca6c4-df644e-201f2d-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