Color
#00366b
#00366brgb(0, 54, 107)hsl(210, 100%, 21%)oklch(0.335 0.106 253.8)Colors that go with #00366b
Crimson, Teal 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.
Crimson #dc143c
triadicshippedCrimson completes a triad with #00366b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Teal #008080
analogousshippedTeal is #00366b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped9 real palettes, including Alaska Airlines's brand system and Monzo's brand system put Blue beside #00366b, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #00366b: 6 real palettes, including Open House and Coastal, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #00366b: 4 real palettes, including Purina Pro Plan's brand system and Blue Mono, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #00366b: 5 real palettes, including Lamborghini's brand system and Vimeo's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #00366b: 19 real palettes, including Hasbro's brand system and Panasonic's brand system, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #00366b: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #00366b
Tints & shades
Harmonies
Contrast
| #00366b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 12.07:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.74:1 | 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 #00366b as the background.
Brands using this color
Fonts for this mood
#00366b reads as cool, vivid, dark. 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 #00366b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/00366b-9cabc4-df514e-1f202d-e9f1f1?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