Color

#121bc4

#121bc4
hex#121bc4
rgbrgb(18, 27, 196)
hslhsl(237, 83%, 42%)
oklchoklch(0.391 0.243 266.3)
Closest name: mediumblue (#0000cd)Relative luminance 0.049

Tints & shades

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

Harmonies

Complementary

Open in tool →

#c4bb12

#1274c4 · #6212c4

#c4121b · #1bc412

Split-complementary

Open in tool →

#c46212 · #74c412

#c41274 · #c4bb12 · #12c462

Contrast

#121bc4 as textRatioAAAA largeAAAFix
Aaon white
10.61:1passpasspassPasses AAA — no fix needed.
Aaon black
1.98:1failfailfail
  • AA: use #6068f0 as the text (4.74:1)
  • AAA: use #868bf4 as the text (7.01:1)
  • AA: or shift the background to #ababab (4.62:1)
  • AAA: or shift the background to #d4d4d4 (7.16:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #121bc4 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

#121bc4 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #121bc4
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 #121bc4 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/121bc4-9f9cc4-df924e-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