Color
#21373f
#21373frgb(33, 55, 63)hsl(196, 31%, 19%)oklch(0.322 0.031 222.9)Colors that go with #21373f
Dark Olive Green, Sienna and Steel 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
triadicshippedDark Olive Green completes a triad with #21373f — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #21373f on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Steel Blue #4682b4
analogousshippedSteel Blue is #21373f'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 #21373f'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 #21373f in 9 real palettes, including Beach Hut and McDonald's's brand system, as the supporting colour.
Blue #0000ff
shipped15 real palettes, including Minecraft's brand system and Headspace's brand system put Blue beside #21373f, as the accent.
Blush Pink #e8b4b8
shipped5 real palettes, including Rain Garden and Garden Wedding put Blush Pink beside #21373f, as the accent.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #21373f: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Real palettes that use #21373f
Tints & shades
Harmonies
Contrast
| #21373f as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 12.48:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.68:1 | 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 #21373f as the background.
Brands using this color
- Boeingprimary · #253746 · Δ1.443
- Audiprimary · #2c343f · Δ1.755
- Bloombergsecondary · #2b333f · Δ1.842
- Hermèsaccent · #2b333f · Δ1.842
- PlayStation® Official Site: Consoles, Games, Accessories & MoreSony Interactive Entertainmentsecondary · #2b333f · Δ1.842
- Asanaprimary · #273240 · Δ1.88
- Dockerprimary · #2c333f · Δ1.948
- Vimeosecondary · #23313b · Δ1.961
Fonts for this mood
#21373f reads as cool, muted, dark. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #21373f and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21373f-9cb5c4-df4e6e-1f232d-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