Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#4381a3
#4381a3
hex
#4381a3rgb
rgb(67, 129, 163)hsl
hsl(201, 42%, 45%)oklch
oklch(0.576 0.083 234.7)Closest name: steelblue (#4682b4)Relative luminance 0.1954
Colors that go with #4381a3
Charcoal, Copper and Royal 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 #4381a3: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
complementaryshippedCopper sits directly opposite #4381a3 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Royal Blue #4169e1
analogousshippedRoyal Blue is #4381a3'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 #4381a3 in 7 real palettes, including Beach Hut and Wired's brand system, as the supporting colour.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Qualcomm's brand system put Blue beside #4381a3, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #4381a3: 7 real palettes, including Hershey's's brand system and Glacier, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #4381a3 in 12 real palettes, including Retro Pop and Wendy's's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #4381a3: 5 real palettes, including Deep Water and Telegram's brand system, as the lead colour.
Real palettes that use #4381a3
Tints & shades
Harmonies
Contrast
| #4381a3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.28:1 | fail | pass | fail | |
Aaon black | 4.91:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #4381a3 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#4381a3 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #4381a3
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #4381a3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/4381a3-9cb1c4-df4e62-1f222d-e9f1f0?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