Lido
Open in tool →Pool blue, watermelon and sun on white — the poolside summer set; the deep teal text keeps it from going juvenile.
Color
#173240
#173240
hex
#173240rgb
rgb(23, 50, 64)hsl
hsl(200, 47%, 17%)oklch
oklch(0.303 0.042 233)Closest name: Blue Whale (#1e3442)Relative luminance 0.0283
Colors that go with #173240
Royal Blue, Rust and Sienna 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.
Royal Blue #4169e1
analogousshippedRoyal Blue is #173240's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Rust #b7410e
split-complementshippedRust is a split-complement of #173240: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #173240 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Teal #008080
analogousshippedTeal is #173240's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Amber #ffbf00
shippedAmber is paired with #173240 in 6 real palettes, including Beach Hut and Wikipedia's brand system, as the supporting colour.
Blue #0000ff
shipped16 real palettes, including Headspace's brand system and Readymag's brand system put Blue beside #173240, as the accent.
Blush Pink #e8b4b8
shipped6 real palettes, including Rain Garden and Blush put Blush Pink beside #173240, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #173240: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #173240
Tints & shades
Harmonies
Contrast
| #173240 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.4:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.57:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #173240 as the background.
Brands using this color
Palettes built around it
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.
Dusty Blue
Open in tool →Dusty blue and mist with a nude accent — the quiet wedding palette; nothing here competes with a photograph.
Fonts for this mood
#173240 reads as cool, dark, luxury. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #173240
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 #173240 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/173240-9cb2c4-df4e64-1f232d-e9f1f0?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