Color

#1017cb

#1017cb
hex#1017cb
rgbrgb(16, 23, 203)
hslhsl(238, 85%, 43%)
oklchoklch(0.396 0.253 265.9)
Closest name: mediumblue (#0000cd)Relative luminance 0.0503

Colors that go with #1017cb

Charcoal, Cornflower Blue and Crimson 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.

Tints & shades

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

Harmonies

Complementary

Open in tool →

#cbc510

#1074cb · #6710cb

#cb1017 · #17cb10

Split-complementary

Open in tool →

#cb6710 · #74cb10

#cb1074 · #cbc510 · #10cb67

Contrast

#1017cb as textRatioAAAA largeAAAFix
Aaon white
10.46:1passpasspassPasses AAA — no fix needed.
Aaon black
2.01:1failfailfail
  • AA: use #5f64f2 as the text (4.59:1)
  • AAA: use #898df5 as the text (7.19:1)
  • AA: or shift the background to #ababab (4.56:1)
  • AAA: or shift the background to #d4d4d4 (7.06:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #1017cb as the background.

Brands using this color

Fonts for this mood

#1017cb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #1017cb
live endpoint

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.

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

analyze #1017cb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/1017cb-9f9cc4-df944e-251f2d-e9edf1?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