Color
#3f377b
#3f377brgb(63, 55, 123)hsl(247, 38%, 35%)oklch(0.383 0.111 285.2)Colors that go with #3f377b
Steel Blue, Blue and Crimson 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.
Steel Blue #4682b4
analogousshippedSteel Blue is #3f377b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped4 real palettes, including Alaska Airlines's brand system and CVS's brand system put Blue beside #3f377b, as the accent.
Crimson #dc143c
shippedCrimson is paired with #3f377b in 7 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #3f377b: 13 real palettes, including Hasbro's brand system and Hinge's brand system, as the supporting colour.
Midnight Blue #191970
shipped13 real palettes, including Microsoft's brand system and First Snow put Midnight Blue beside #3f377b, as the accent.
Orange Red #ff4500
shippedOrange Red is paired with #3f377b in 4 real palettes, including Tide's brand system and NASA's brand system, as the accent.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #3f377b: 5 real palettes, including First Snow and Glacier, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #3f377b: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #3f377b
Tints & shades
Harmonies
Contrast
| #3f377b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.27:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.04:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #3f377b as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#3f377b 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 #3f377b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f377b-a59cc4-dfaa4e-271f2d-e9ecf1?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