Color
#377eb3
#377eb3rgb(55, 126, 179)hsl(206, 53%, 46%)oklch(0.572 0.108 244)Colors that go with #377eb3
Charcoal, Copper 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 #377eb3: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
complementaryshippedCopper sits directly opposite #377eb3 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 #377eb3 in 10 real palettes, including Wired's brand system and Beach Hut, as the accent.
Blue #0000ff
shipped9 real palettes, including Activision's brand system and Qualcomm's brand system put Blue beside #377eb3, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #377eb3: 8 real palettes, including Hershey's's brand system and Glacier, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #377eb3: 4 real palettes, including Coca-Cola's brand system and NBA's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #377eb3 in 15 real palettes, including Retro Pop and NASCAR's brand system, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #377eb3: 6 real palettes, including Deep Water and Astro's brand system, as the lead colour.
Real palettes that use #377eb3
Tints & shades
Harmonies
Contrast
| #377eb3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.38:1 | fail | pass | fail | |
Aaon black | 4.8:1 | 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 #377eb3 as the background.
Brands using this color
Fonts for this mood
#377eb3 reads as cool, modern. 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 #377eb3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/377eb3-9caec4-df4e56-1f212d-e9f1f1?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