Still Water
Open in tool →Dusty teal and mist with a sand accent — low chroma, low contrast between colours, high contrast for text: the recipe for calm.
Color
#638fa1
#638fa1
hex
#638fa1rgb
rgb(99, 143, 161)hsl
hsl(197, 25%, 51%)oklch
oklch(0.625 0.055 225.4)Closest name: Cavolo Nero (#72939e)Relative luminance 0.2487
Colors that go with #638fa1
Charcoal, Copper and Cobalt 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 #638fa1: softer than #000 and cool enough to feel like part of the same palette.
Copper #b87333
complementaryshippedCopper sits directly opposite #638fa1 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #638fa1: 4 real palettes, including Ink & Paper and Hershey's's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #638fa1 in 5 real palettes, including Retro Pop and Diner, as the lead colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #638fa1: 4 real palettes, including Telegram's brand system and Astro's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #638fa1: 9 real palettes, including Dusk and Peacock, as the lead colour.
Goldenrod #daa520
shippedGoldenrod shows up next to #638fa1 in 4 real palettes, including Ledger Dark and Noir Beauty, as the lead colour.
Midnight Blue #191970
shipped9 real palettes, including Plaid's brand system and Ford's brand system put Midnight Blue beside #638fa1, as the supporting colour.
Real palettes that use #638fa1
Tints & shades
Harmonies
Contrast
| #638fa1 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.52:1 | fail | pass | fail | |
Aaon black | 5.97:1 | pass | 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 #638fa1 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 #638fa1
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 #638fa1 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/638fa1-9cb4c4-df4e6b-1f232d-e9f1ef?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