Color
#301b83
#301b83rgb(48, 27, 131)hsl(252, 66%, 31%)oklch(0.33 0.161 282.3)Colors that go with #301b83
Steel Blue, Charcoal 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #301b83's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #301b83: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with #301b83 in 6 real palettes, including Casper Sleep's brand system and Pepsi's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #301b83: 5 real palettes, including Bank of America's brand system and Panasonic's brand system, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #301b83 in 4 real palettes, including Discord's brand system and Nivea's brand system, as the lead colour.
Olive Green #808000
complementaryOlive Green sits directly opposite #301b83 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Light Sea Green #20b2aa
shippedLight Sea Green shows up next to #301b83 in 3 real palettes, including Taco Bell's brand system and Confluent's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #301b83 in 3 real palettes, including Gillette's brand system and Boeing's brand system, as the lead colour.
Real palettes that use #301b83
Tints & shades
Harmonies
Contrast
| #301b83 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.04:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.61:1 | 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 #301b83 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
#301b83 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 #301b83 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/301b83-a99cc4-dfb64e-281f2d-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