Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#3777a0
#3777a0
hex
#3777a0rgb
rgb(55, 119, 160)hsl
hsl(203, 49%, 42%)oklch
oklch(0.546 0.092 239.6)Closest name: Cry Me a River (#427898)Relative luminance 0.1654
Colors that go with #3777a0
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 #3777a0: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #3777a0'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 #3777a0 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 #3777a0 in 8 real palettes, including Lemon Squeezy's brand system and Beach Hut, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #3777a0, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3777a0: 8 real palettes, including Fintech Trust and Glacier, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #3777a0: 4 real palettes, including Dusk and Riverbed, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3777a0 in 15 real palettes, including Retro Pop and Wendy's's brand system, as the lead colour.
Real palettes that use #3777a0
Tints & shades
Harmonies
Contrast
| #3777a0 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.87:1 | pass | pass | fail |
|
Aaon black | 4.31:1 | 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 #3777a0 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
#3777a0 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3777a0
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 #3777a0 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3777a0-9cb0c4-df4e5d-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