Tide Pool
Open in tool →Sea-green and slate with a coral — a literal tide pool: two cool tones, one warm creature.
Color
#303345
#303345
hex
#303345rgb
rgb(48, 51, 69)hsl
hsl(231, 18%, 23%)oklch
oklch(0.326 0.032 277.1)Closest name: Blue Whale (#1e3442)Relative luminance 0.0343
Colors that go with #303345
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 #303345 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 #303345 — 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 #303345: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Slate Blue #6a5acd
analogousshippedSlate Blue is #303345'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 #303345'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 #303345 in 6 real palettes, including Beach Hut and Wikipedia's brand system, as the supporting colour.
Blue #0000ff
shipped13 real palettes, including Dunkin''s brand system and Headspace's brand system put Blue beside #303345, as the supporting colour.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #303345: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #303345
Tints & shades
Harmonies
Contrast
| #303345 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 12.46:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.69:1 | 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 #303345 as the background.
Brands using this color
- Mercuryprimary · #323341 · Δ0.779
- Dockerprimary · #2c333f · Δ1.323
- Bloombergsecondary · #2b333f · Δ1.419
- PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainmentsecondary · #2b333f · Δ1.419
- Audiprimary · #2c343f · Δ1.424
- Volkswagensecondary · #293043 · Δ1.602
- Asanaprimary · #273240 · Δ1.777
- Boeingprimary · #253746 · Δ1.949
Palettes built around it
Fonts for this mood
#303345 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #303345
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 #303345 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/303345-9c9ec4-df834e-231f2d-e9eef1?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