Color
#684fb5
#684fb5rgb(104, 79, 181)hsl(255, 41%, 51%)oklch(0.506 0.155 291.1)Colors that go with #684fb5
Charcoal, Sea Green 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 #684fb5: softer than #000 and cool enough to feel like part of the same palette.
Sea Green #2e8b57
split-complementshippedSea Green is a split-complement of #684fb5: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Amber #ffbf00
shippedAmber is paired with #684fb5 in 4 real palettes, including Warner Bros.'s brand system and Wikipedia's brand system, as the accent.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #684fb5: 5 real palettes, including Coca-Cola's brand system and Gopro's brand system, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #684fb5 in 9 real palettes, including Marvel's brand system and Netflix's brand system, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #684fb5: 4 real palettes, including Campbell's's brand system and Datadog's brand system, as the supporting colour.
Light Sky Blue #87cefa
shippedLight Sky Blue is paired with #684fb5 in 4 real palettes, including Sentry's brand system and Calm's brand system, as the accent.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #684fb5 in 5 real palettes, including Indigo SaaS and Fintech Trust, as the accent.
Real palettes that use #684fb5
Tints & shades
Harmonies
Contrast
| #684fb5 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 6.22:1 | pass | pass | fail |
|
Aaon black | 3.37:1 | 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 #684fb5 as the background.
Brands using this color
Fonts for this mood
#684fb5 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 #684fb5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/684fb5-ab9cc4-dfbd4e-291f2d-e9ebf1?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