Color

#151b65

#151b65
hex#151b65
rgbrgb(21, 27, 101)
hslhsl(236, 66%, 24%)
oklchoklch(0.277 0.127 271.2)
Closest name: midnightblue (#191970)Relative luminance 0.0188

Tints & shades

Every swatch is its own page — click any to analyze it.

Harmonies

Complementary

Open in tool →

#666015

#154366 · #381566

#66151a · #1a6615

Split-complementary

Open in tool →

#663815 · #436615

#661543 · #666015 · #156638

Contrast

#151b65 as textRatioAAAA largeAAAFix
Aaon white
15.26:1passpasspassPasses AAA — no fix needed.
Aaon black
1.38:1failfailfail
  • AA: use #626bdf as the text (4.69:1)
  • AAA: use #888fe7 as the text (7.13:1)
  • AA: or shift the background to #8c8c8c (4.54:1)
  • AAA: or shift the background to #b0b0b0 (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #151b65 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Fonts for this mood

#151b65 reads as cool, vivid, dark. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #151b65
live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp
claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt

analyze #151b65 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/151b65-9e9cc4-df8f4e-241f2d-e9eef1?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md