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
#12313f
#12313f
hex
#12313frgb
rgb(18, 49, 63)hsl
hsl(199, 56%, 16%)oklch
oklch(0.297 0.044 230.3)Closest name: Nordic Noir (#003344)Relative luminance 0.0268
Colors that go with #12313f
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 #12313f'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 #12313f: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #12313f 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 #12313f'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 #12313f in 10 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped19 real palettes, including Headspace's brand system and Minecraft's brand system put Blue beside #12313f, as the accent.
Blush Pink #e8b4b8
shipped6 real palettes, including Rain Garden and Graphite Mono put Blush Pink beside #12313f, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #12313f: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #12313f
Tints & shades
Harmonies
Contrast
| #12313f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.66:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.54:1 | 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 #12313f as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#12313f reads as cool, dark, luxury. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #12313f
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 #12313f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/12313f-9cb3c4-df4e66-1f232d-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