Color

#121aa5

#121aa5
hex#121aa5
rgbrgb(18, 26, 165)
hslhsl(237, 80%, 36%)
oklchoklch(0.351 0.209 267.1)
Closest name: Dark Galaxy (#0018a8)Relative luminance 0.0358

Colors that go with #121aa5

Charcoal, Crimson and Steel Blue 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 →

#a59e12

#1263a5 · #5412a5

#a5121a · #1aa512

Split-complementary

Open in tool →

#a55412 · #63a512

#a51263 · #a59e12 · #12a554

Contrast

#121aa5 as textRatioAAAA largeAAAFix
Aaon white
12.23:1passpasspassPasses AAA — no fix needed.
Aaon black
1.72:1failfailfail
  • AA: use #5e65ed as the text (4.56:1)
  • AAA: use #888df2 as the text (7.14:1)
  • AA: or shift the background to #9e9e9e (4.57:1)
  • AAA: or shift the background to #c4c4c4 (7.01:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #121aa5 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

#121aa5 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #121aa5
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 #121aa5 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/121aa5-9f9cc4-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