Mid-Century
Open in tool →Tangerine, teal and mustard on cream — the 1960s lounge trio, one of the few retro palettes with real hue contrast.
Color
#21717d
#21717d
hex
#21717drgb
rgb(33, 113, 125)hsl
hsl(188, 58%, 31%)oklch
oklch(0.507 0.077 209.5)Closest name: Astral (#376f89)Relative luminance 0.1361
Colors that go with #21717d
Charcoal, Rust 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 #21717d: softer than #000 and cool enough to feel like part of the same palette.
Rust #b7410e
complementaryshippedRust sits directly opposite #21717d on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #21717d in 4 real palettes, including Lemon Squeezy's brand system and McDonald's's brand system, as the lead colour.
Blue #0000ff
shipped5 real palettes, including Warp's brand system and Activision's brand system put Blue beside #21717d, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #21717d: 6 real palettes, including Fintech Trust and Ink & Paper, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #21717d: 5 real palettes, including Desert Road and Riverbed, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #21717d in 13 real palettes, including Gemstone and Redfin's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #21717d: 4 real palettes, including Deep Water and Warp's brand system, as the lead colour.
Real palettes that use #21717d
Tints & shades
Harmonies
Contrast
| #21717d as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.64:1 | pass | pass | fail |
|
Aaon black | 3.72:1 | 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 #21717d 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
Fonts for this mood
#21717d reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21717d
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 #21717d and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21717d-a2b7be-df4e81-1f252d-e9f1ee?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