Color

#003f9e

#003f9e
hex#003f9e
rgbrgb(0, 63, 158)
hslhsl(216, 100%, 31%)
oklchoklch(0.4 0.165 260.2)
Closest name: Blue Hour (#0034ab)Relative luminance 0.0602

Tints & shades

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

Harmonies

Complementary

Open in tool →

#9e5f00

#008e9e · #10009e

#9e003f · #3f9e00

Split-complementary

Open in tool →

#9e1000 · #8e9e00

#9e008e · #9e5f00 · #009e10

Contrast

#003f9e as textRatioAAAA largeAAAFix
Aaon white
9.52:1passpasspassPasses AAA — no fix needed.
Aaon black
2.2:1failfailfail
  • AA: use #0a6cff as the text (4.6:1)
  • AAA: use #5297ff as the text (7.23:1)
  • AA: or shift the background to #b3b3b3 (4.54:1)
  • AAA: or shift the background to #dedede (7.08:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #003f9e 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

#003f9e reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #003f9e
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 #003f9e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/003f9e-9ca7c4-df5f4e-201f2d-e9f0f1?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