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
#0a313e
#0a313e
hex
#0a313ergb
rgb(10, 49, 62)hsl
hsl(195, 72%, 14%)oklch
oklch(0.293 0.048 224.6)Closest name: Nordic Noir (#003344)Relative luminance 0.0261
Colors that go with #0a313e
Crimson, Royal Blue and Rust 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.
Crimson #dc143c
split-complementshippedCrimson is a split-complement of #0a313e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
analogousshippedRoyal Blue is #0a313e's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Rust #b7410e
complementaryshippedRust sits directly opposite #0a313e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sienna #a0522d
split-complementshippedSienna is a split-complement of #0a313e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Teal #008080
analogousshippedTeal is #0a313e'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 #0a313e in 10 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped19 real palettes, including Monzo's brand system and Headspace's brand system put Blue beside #0a313e, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #0a313e: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #0a313e
Tints & shades
Harmonies
Contrast
| #0a313e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.8:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.52:1 | 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 #0a313e as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#0a313e reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #0a313e
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 #0a313e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/0a313e-9cb5c4-df4e70-1f242d-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