Color
#00308f
#00308frgb(0, 48, 143)hsl(220, 100%, 28%)oklch(0.355 0.164 262)Colors that go with #00308f
Charcoal, Crimson 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 #00308f: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #00308f — 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 #00308f'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 #00308f, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #00308f: 10 real palettes, including Warbyparker's brand system and Hasbro's brand system, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #00308f 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 #00308f in 8 real palettes, including Nivea's brand system and Discord's brand system, as the supporting colour.
Tomato #ff6347
shipped4 real palettes, including dbt Labs's brand system and FedEx's brand system put Tomato beside #00308f, as the lead colour.
Real palettes that use #00308f
Tints & shades
Harmonies
Contrast
| #00308f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 11.54:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.82:1 | 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 #00308f as the background.
Brands using this color
Fonts for this mood
#00308f 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 #00308f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/00308f-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