Color
#3f115a
#3f115argb(63, 17, 90)hsl(278, 68%, 21%)oklch(0.296 0.124 309.4)Colors that go with #3f115a
Charcoal, Blue and Cadet 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 #3f115a: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped4 real palettes, including Sketch's brand system and Monzo's brand system put Blue beside #3f115a, as the accent.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with #3f115a: 4 real palettes, including SoFi's brand system and Open House, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #3f115a: 4 real palettes, including Blue Mono and Purina Pro Plan's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #3f115a in 5 real palettes, including Casper Sleep's brand system and Marvel's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #3f115a: 13 real palettes, including Discover's brand system and Panasonic's brand system, as the supporting colour.
Light Pink #ffb6c1
shippedLight Pink shows up next to #3f115a in 4 real palettes, including Sorbet and Macaron, as the lead colour.
Olive Drab #6b8e23
complementaryOlive Drab sits directly opposite #3f115a on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Real palettes that use #3f115a
Tints & shades
Harmonies
Contrast
| #3f115a as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 14.59:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.44:1 | 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 #3f115a as the background.
Brands using this color
Fonts for this mood
#3f115a reads as cool, vivid, dark. 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 #3f115a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/3f115a-ba9cc4-bbcb62-2d1f2c-ebe9f1?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