Clinic
Open in tool →Teal reads clinical without the coldness of pure blue; the coral accent adds warmth for reassurance moments.
Color
#21708c
#21708c
hex
#21708crgb
rgb(33, 112, 140)hsl
hsl(196, 62%, 34%)oklch
oklch(0.511 0.086 226.3)Closest name: Chill of the Night (#256d8d)Relative luminance 0.1381
Colors that go with #21708c
Charcoal, Crimson and Royal 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 #21708c: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
split-complementshippedCrimson is a split-complement of #21708c: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
analogousshippedRoyal Blue is #21708c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #21708c 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 #21708c in 5 real palettes, including Lemon Squeezy's brand system and Beach Hut, as the lead colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #21708c: 6 real palettes, including Fintech Trust and Glacier, as the lead colour.
Copper #b87333
shippedDesigners have shipped Copper with #21708c: 5 real palettes, including Dusk and Desert Road, as the accent.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #21708c: 5 real palettes, including Wendy's's brand system and AT&T's brand system, as the supporting colour.
Real palettes that use #21708c
Tints & shades
Harmonies
Contrast
| #21708c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 5.58:1 | pass | pass | fail |
|
Aaon black | 3.76:1 | 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 #21708c 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
Alpine
Open in tool →Glacier blue with a safety-orange accent: technical outdoor gear, not lifestyle.
Sapphire & Gold
Open in tool →Deep sapphire and gold with a teal — old-money jewel tones on an ivory ground; heraldic without a crest.
Fonts for this mood
#21708c reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #21708c
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 #21708c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21708c-9cb5c4-df4e6e-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