Ink & Paper
Open in tool →Two greys and one ink-blue link color: the palette of a well-set book page.
Color
#181d21
#181d21
hex
#181d21rgb
rgb(24, 29, 33)hsl
hsl(207, 16%, 11%)oklch
oklch(0.227 0.011 242.2)Closest name: Coco’s Black (#1c1c1a)Relative luminance 0.0118
Colors that go with #181d21
Charcoal, Amber and 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black that reads cleanly against #181d21 without the hard edge of pure #000.
Amber #ffbf00
shippedAmber is paired with #181d21 in 18 real palettes, including Warner Bros.'s brand system and Google's brand system, as the accent.
Blue #0000ff
shipped23 real palettes, including Signal's brand system and CVS's brand system put Blue beside #181d21, as the supporting colour.
Blue Violet #8a2be2
shippedBlue Violet is paired with #181d21 in 10 real palettes, including Yahoo's brand system and ClickUp's brand system, as the supporting colour.
Blush Pink #e8b4b8
shipped5 real palettes, including Graphite Mono and Estate put Blush Pink beside #181d21, as the accent.
Brown #a52a2a
shipped5 real palettes, including Woodsmoke and State Farm's brand system put Brown beside #181d21, as the accent.
Burgundy #800020
shipped4 real palettes, including Qatar Airways's brand system and Mailchimp's brand system put Burgundy beside #181d21, as the accent.
Burlywood #deb887
shippedBurlywood is paired with #181d21 in 6 real palettes, including Coffee Bar and Kiln, as the accent.
Real palettes that use #181d21
Tints & shades
Harmonies
Contrast
| #181d21 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 16.98:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.24:1 | 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 #181d21 as the background.
Brands using this color
- Fitbitprimary · #191c1d · Δ0.747
- Fitbittext · #191c1d · Δ0.747
- Audisecondary · #181d25 · Δ0.796
- WhatsAppprimary · #1c1e21 · Δ0.838
- WhatsApptext · #1c1e21 · Δ0.838
- Braveprimary · #1c1c1d · Δ0.952
- Bravetext · #1c1c1d · Δ0.952
- Airtableaccent · #181d26 · Δ0.996
- Nokiatext · #1d1e20 · Δ1.03
- Boxtext · #151f26 · Δ1.059
- Splinetext · #191a1d · Δ1.126
- Logitechprimary · #1b1b1b · Δ1.199
- Logitechtext · #1b1b1b · Δ1.199
- N26text · #1b1b1b · Δ1.199
- NASAtext · #1b1b1b · Δ1.199
- Signalprimary · #1b1b1b · Δ1.199
- Signaltext · #1b1b1b · Δ1.199
- Formula 1text · #1c1c25 · Δ1.231
- Netlifytext · #181a1c · Δ1.236
- Figmatext · #1e1e1e · Δ1.323
- Vimeotext · #141a20 · Δ1.364
- Gustoprimary · #1c1b1a · Δ1.4
- Gustotext · #1c1b1a · Δ1.4
- Hingetext · #1a1a1a · Δ1.443
- Louis Vuittonprimary · #1a1a1a · Δ1.443
- Louis Vuittontext · #1a1a1a · Δ1.443
- Spectrumprimary · #1a1a1a · Δ1.443
- Spectrumtext · #1a1a1a · Δ1.443
- Warner Bros.primary · #1a1a1a · Δ1.443
- Warner Bros.text · #1a1a1a · Δ1.443
- JetBrainstext · #19191c · Δ1.482
- Asanasecondary · #151b26 · Δ1.505
- CVSprimary · #1a1a19 · Δ1.579
- CVStext · #1a1a19 · Δ1.579
- GitLabtext · #1f1f1f · Δ1.608
- Googletext · #1f1f1f · Δ1.608
- HubSpottext · #1f1f1f · Δ1.608
- NFLaccent · #172029 · Δ1.608
- Philipsprimary · #15191e · Δ1.608
- Philipstext · #15191e · Δ1.608
- Revoluttext · #1f1f1f · Δ1.608
- Yahooprimary · #1a1919 · Δ1.752
- Yahootext · #1a1919 · Δ1.752
- Huaweitext · #191919 · Δ1.763
- Notionprimary · #191919 · Δ1.763
- Pumaprimary · #191919 · Δ1.763
- Pumatext · #191919 · Δ1.763
- Bumbleprimary · #202020 · Δ1.943
- Bumbletext · #202020 · Δ1.943
- ClickUptext · #202020 · Δ1.943
- Lamborghiniprimary · #202020 · Δ1.943
- Lamborghinitext · #202020 · Δ1.943
- Victoria's Secretprimary · #221d1d · Δ1.949
- Victoria's Secrettext · #221d1d · Δ1.949
- Appleprimary · #221e1f · Δ1.953
Palettes built around it
Console Light
Open in tool →A sober docs palette: one blue for interactive, one green for success, zinc greys for everything else.
Graphite
Open in tool →A greyscale system with a single amber — the accent does all the work, so allow one per screen.
Fresh Juice
Open in tool →Orange, mango and mint — a sugar rush; keep the type black so it stays legible under all that color.
Learning App
Open in tool →Green, blue and orange at full saturation: the gamified-learning look, where every color is a reward.
Playground
Open in tool →Orange, blue and green — the colors of playground equipment; loud, cheerful, obviously for kids.
Studio Grey
Open in tool →A pure greyscale with a single electric blue — the portfolio palette that makes work look considered.
Diner
Open in tool →Cherry red, mint-teal and butter yellow — chrome-and-vinyl retro; the red does the work, the teal cools it.
Fireside
Open in tool →Cranberry, pine and brass on a charcoal night — the holiday palette without the clichés, because the surface is cold.
Fonts for this mood
#181d21 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #181d21
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 #181d21 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/181d21-9cadc4-df4e53-1f212d-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