Dusk
Open in tool →Slate blue with a copper accent — calm, professional, slightly editorial; suits consultancies and journals.
Color
#909cbb
#909cbb
hex
#909cbbrgb
rgb(144, 156, 187)hsl
hsl(223, 24%, 65%)oklch
oklch(0.694 0.048 268.5)Closest name: Blank Stare (#8b9cac)Relative luminance 0.3329
Colors that go with #909cbb
Charcoal, Peru and Copper 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 #909cbb: softer than #000 and cool enough to feel like part of the same palette.
Peru #cd853f
complementaryshippedPeru sits directly opposite #909cbb on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Copper #b87333
shippedDesigners have shipped Copper with #909cbb: 4 real palettes, including Dusk and Riverbed, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #909cbb: 4 real palettes, including Calm's brand system and Snowflake AI Data Cloud's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #909cbb: 5 real palettes, including Dusk and Open House, as the lead colour.
Midnight Blue #191970
shipped8 real palettes, including Open House and First Snow put Midnight Blue beside #909cbb, as the text colour against it.
Periwinkle #ccccff
shippedPeriwinkle shows up next to #909cbb in 4 real palettes, including Calendly's brand system and Blue Mono, as the supporting colour.
Powder Blue #b0e0e6
shippedDesigners have shipped Powder Blue with #909cbb: 5 real palettes, including First Snow and Crypto.com's brand system, as the accent.
Real palettes that use #909cbb
Tints & shades
Harmonies
Contrast
| #909cbb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.74:1 | fail | fail | fail | |
Aaon black | 7.66:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #909cbb as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
mcpConnect your agent — build around #909cbb
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #909cbb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/909cbb-9ca3c4-df704e-211f2d-e9eff1?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