Color
#3f3489
#3f3489rgb(63, 52, 137)hsl(248, 45%, 37%)oklch(0.388 0.136 284)Colors that go with #3f3489
Charcoal, Steel Blue and Blue 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 #3f3489: softer than #000 and cool enough to feel like part of the same palette.
Steel Blue #4682b4
analogousshippedSteel Blue is #3f3489's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped5 real palettes, including Procter & Gamble's brand system and CVS's brand system put Blue beside #3f3489, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #3f3489 in 9 real palettes, including Walgreens's brand system and Casper Sleep's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #3f3489: 16 real palettes, including Warbyparker's brand system and Unilever's brand system, as the accent.
Midnight Blue #191970
shipped13 real palettes, including Fintech Trust and Microsoft's brand system put Midnight Blue beside #3f3489, as that palette's text colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #3f3489 in 9 real palettes, including Nokia's brand system and Nivea's brand system, as the supporting colour.
Taupe #483c32
shippedTaupe is paired with #3f3489 in 5 real palettes, including Gillette's brand system and Datadog's brand system, as the lead colour.
Real palettes that use #3f3489
Tints & shades
Harmonies
Contrast
| #3f3489 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 10.18:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.06:1 | 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 #3f3489 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
#3f3489 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 #3f3489 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f3489-a69cc4-dfac4e-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