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.
Color
#23313e
#23313e
hex
#23313ergb
rgb(35, 49, 62)hsl
hsl(209, 28%, 19%)oklch
oklch(0.306 0.03 247)Closest name: Blue Whale (#1e3442)Relative luminance 0.029
Colors that go with #23313e
Dark Olive Green, Sienna and Slate 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.
Dark Olive Green #556b2f
split-complementshippedDark Olive Green is a split-complement of #23313e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #23313e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Slate Blue #6a5acd
analogousshippedSlate Blue is #23313e's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Teal #008080
analogousshippedTeal is #23313e'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 #23313e in 6 real palettes, including Beach Hut and Wikipedia's brand system, as the supporting colour.
Blue #0000ff
shipped15 real palettes, including Headspace's brand system and Readymag's brand system put Blue beside #23313e, as the accent.
Blush Pink #e8b4b8
shipped6 real palettes, including Rain Garden and Blush put Blush Pink beside #23313e, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #23313e: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #23313e
Tints & shades
Harmonies
Contrast
| #23313e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 13.29:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.58:1 | 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 #23313e as the background.
Brands using this color
- Vimeosecondary · #23313b · Δ0.558
- Asanaprimary · #273240 · Δ0.792
- UEFAsecondary · #1a313c · Δ1.286
- Volkswagensecondary · #293043 · Δ1.435
- Bloombergsecondary · #2b333f · Δ1.464
- PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainmentsecondary · #2b333f · Δ1.464
- Dockerprimary · #2c333f · Δ1.609
- Audiprimary · #2c343f · Δ1.798
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
#23313e reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #23313e
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 #23313e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/23313e-9cacc4-df4e4e-1f212d-e9f1f1?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