Tide Pool
Open in tool →Sea-green and slate with a coral — a literal tide pool: two cool tones, one warm creature.
Color
#283143
#283143
hex
#283143rgb
rgb(40, 49, 67)hsl
hsl(220, 25%, 21%)oklch
oklch(0.313 0.035 263.9)Closest name: Blue Whale (#1e3442)Relative luminance 0.0305
Colors that go with #283143
Dark Olive Green, Sea Green 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.
Dark Olive Green #556b2f
complementaryshippedDark Olive Green sits directly opposite #283143 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sea Green #2e8b57
triadicshippedSea Green completes a triad with #283143 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
split-complementshippedSienna is a split-complement of #283143: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Slate Blue #6a5acd
analogousshippedSlate Blue is #283143's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Steel Blue #4682b4
analogousshippedSteel Blue is #283143'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 #283143 in 9 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped16 real palettes, including Minecraft's brand system and Headspace's brand system put Blue beside #283143, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #283143: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #283143
Tints & shades
Harmonies
Contrast
| #283143 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.04:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.61:1 | 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 #283143 as the background.
Brands using this color
- Volkswagensecondary · #293043 · Δ0.352
- Asanaprimary · #273240 · Δ0.746
- Bloombergsecondary · #2b333f · Δ1.238
- Hermèsaccent · #2b333f · Δ1.238
- PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainmentsecondary · #2b333f · Δ1.238
- Dockerprimary · #2c333f · Δ1.308
- Amazonsecondary · #232f3e · Δ1.344
- Audiprimary · #2c343f · Δ1.576
- Vimeosecondary · #23313b · Δ1.727
- Mercuryprimary · #323341 · Δ1.879
- Boeingprimary · #253746 · Δ1.924
Palettes built around it
Harbour
Open in tool →Steel blue and haze with a buoy orange on a pale grey — the maritime palette every port town uses for a reason.
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
#283143 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #283143
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 #283143 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/283143-9ca5c4-df694e-211f2d-e9f0f1?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