Color

#2399be

#2399be
hex#2399be
rgbrgb(35, 153, 190)
hslhsl(194, 69%, 44%)
oklchoklch(0.637 0.112 224.7)
Closest name: Blue Ocean (#009dc4)Relative luminance 0.2686

Colors that go with #2399be

Charcoal, Denim and Goldenrod 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.

Real palettes that use #2399be

Tints & shades

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

Harmonies

Complementary

Open in tool →

#be4723

#23be94 · #234cbe

#be2399 · #99be23

Split-complementary

Open in tool →

#be234c · #be9423

#9423be · #be4723 · #4cbe23

Contrast

#2399be as textRatioAAAA largeAAAFix
Aaon white
3.3:1failpassfail
  • AA: use #1c7e9b as the text (4.66:1)
  • AAA: use #155e74 as the text (7.28:1)
  • AA: or shift the background to #262626 (4.59:1)
Aaon black
6.37:1passpassfail
  • AAA: use #25a4cb as the text (7.25:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #2399be 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

#2399be reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #2399be
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 #2399be and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/2399be-9cb6c4-df4e72-1f242d-e9f1ef?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