Color
#3f6597
#3f6597rgb(63, 101, 151)hsl(214, 41%, 42%)oklch(0.502 0.091 255.8)Colors that go with #3f6597
Charcoal, Sea Green 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 #3f6597: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #3f6597 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #3f6597 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 #3f6597 in 8 real palettes, including McDonald's's brand system and Lemon Squeezy's brand system, as the lead colour.
Blue #0000ff
shipped4 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #3f6597, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3f6597: 7 real palettes, including Fintech Trust and Glacier, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #3f6597 in 18 real palettes, including McDonald's's brand system and Wendy's's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #3f6597: 4 real palettes, including Venmo's brand system and Deep Water, as the supporting colour.
Real palettes that use #3f6597
Tints & shades
Harmonies
Contrast
| #3f6597 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.97:1 | pass | pass | fail |
|
Aaon black | 3.52:1 | 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 #3f6597 as the background.
Brands using this color
Fonts for this mood
#3f6597 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 #3f6597 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f6597-9ca9c4-df5a4e-1f1f2d-e9f0f1?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