Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#337aa3
#337aa3
hex
#337aa3rgb
rgb(51, 122, 163)hsl
hsl(202, 52%, 42%)oklch
oklch(0.553 0.095 237.4)Closest name: Cry Me a River (#427898)Relative luminance 0.1727
Colors that go with #337aa3
Charcoal, Royal Blue and Sienna 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 #337aa3: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #337aa3's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #337aa3 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #337aa3 in 8 real palettes, including Lemon Squeezy's brand system and Beach Hut, as the lead colour.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #337aa3, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #337aa3: 8 real palettes, including Glacier and Hershey's's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #337aa3 in 16 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 #337aa3: 5 real palettes, including Deep Water and Venmo's brand system, as the lead colour.
Real palettes that use #337aa3
Tints & shades
Harmonies
Contrast
| #337aa3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.72:1 | pass | pass | fail |
|
Aaon black | 4.45:1 | fail | 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 #337aa3 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#337aa3 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #337aa3
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 #337aa3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/337aa3-9cb1c4-df4e5f-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