Blueprint
Open in tool →Cyan and indigo on navy is the developer-tool look; amber is the only warm note, so it always reads as 'attention'.
Color
#151b29
#151b29
hex
#151b29rgb
rgb(21, 27, 41)hsl
hsl(222, 32%, 12%)oklch
oklch(0.223 0.029 266.2)Closest name: Dark Knight (#151931)Relative luminance 0.011
Colors that go with #151b29
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 #151b29 without the hard edge of pure #000.
Amber #ffbf00
shippedAmber is paired with #151b29 in 18 real palettes, including Blueprint and Warner Bros.'s brand system, as the accent.
Blue #0000ff
shipped23 real palettes, including Warp's brand system and Monzo's brand system put Blue beside #151b29, as the supporting colour.
Blue Violet #8a2be2
shippedBlue Violet is paired with #151b29 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 Estate and Graphite Mono put Blush Pink beside #151b29, as the accent.
Brown #a52a2a
shipped5 real palettes, including Woodsmoke and State Farm's brand system put Brown beside #151b29, as the accent.
Burgundy #800020
shipped4 real palettes, including Qatar Airways's brand system and Mailchimp's brand system put Burgundy beside #151b29, as the accent.
Burlywood #deb887
shippedBurlywood is paired with #151b29 in 6 real palettes, including Coffee Bar and Kiln, as the accent.
Real palettes that use #151b29
Tints & shades
Harmonies
Contrast
| #151b29 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 17.2:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.22:1 | 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 #151b29 as the background.
Brands using this color
Palettes built around it
Indigo SaaS
Open in tool →The dependable indigo-and-emerald B2B pairing: indigo for primary actions, emerald reserved for success states.
Slate Workspace
Open in tool →Slate on slate with a single blue — the productivity-app look where the interface disappears behind the work.
Clinic
Open in tool →Teal reads clinical without the coldness of pure blue; the coral accent adds warmth for reassurance moments.
Arctic
Open in tool →Navy type on white with an ice-blue accent: crisp and corporate without going grey.
Cobalt Pop
Open in tool →One deep cobalt and one hot pink on white — a two-accent system for launches and campaign pages that need punch.
Fireside
Open in tool →Cranberry, pine and brass on a charcoal night — the holiday palette without the clichés, because the surface is cold.
Sapphire & Gold
Open in tool →Deep sapphire and gold with a teal — old-money jewel tones on an ivory ground; heraldic without a crest.
Peacock
Open in tool →Teal, cobalt and magenta at full chroma on white — jewel tones in daylight; the trick is a near-black text with a blue cast.
Fonts for this mood
#151b29 reads as cool, muted, dark. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #151b29
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 #151b29 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/151b29-9ca3c4-df6e4e-211f2d-e9eff1?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