Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#3978a2
#3978a2
hex
#3978a2rgb
rgb(57, 120, 162)hsl
hsl(204, 48%, 43%)oklch
oklch(0.55 0.092 240.5)Closest name: Cry Me a River (#427898)Relative luminance 0.1691
Colors that go with #3978a2
Charcoal, Royal Blue and Amber 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 #3978a2: softer than #000 and cool enough to feel like part of the same palette.
Royal Blue #4169e1
analogousshippedRoyal Blue is #3978a2'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 #3978a2 in 7 real palettes, including Lemon Squeezy's brand system and Beach Hut, as the lead colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3978a2: 7 real palettes, including Glacier and Fintech Trust, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #3978a2: 4 real palettes, including Dusk and Riverbed, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3978a2 in 11 real palettes, including Retro Pop and State Farm's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #3978a2: 5 real palettes, including Wendy's's brand system and AT&T's brand system, as the supporting colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #3978a2 in 4 real palettes, including Sapphire & Gold and Open House, as the supporting colour.
Real palettes that use #3978a2
Tints & shades
Harmonies
Contrast
| #3978a2 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.79:1 | pass | pass | fail |
|
Aaon black | 4.38:1 | 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 #3978a2 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
#3978a2 reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #3978a2
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 #3978a2 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/3978a2-9cafc4-df4e5a-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