Color

#2128ab

#2128ab
hex#2128ab
rgbrgb(33, 40, 171)
hslhsl(237, 68%, 40%)
oklchoklch(0.382 0.201 269.8)
Closest name: Blue Hour (#0034ab)Relative luminance 0.0478

Tints & shades

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

Harmonies

Complementary

Open in tool →

#aba421

#216dab · #5f21ab

#ab2128 · #28ab21

Split-complementary

Open in tool →

#ab5f21 · #6dab21

#ab216d · #aba421 · #21ab5f

Contrast

#2128ab as textRatioAAAA largeAAAFix
Aaon white
10.73:1passpasspassPasses AAA — no fix needed.
Aaon black
1.96:1failfailfail
  • AA: use #6067e1 as the text (4.52:1)
  • AAA: use #8b90e9 as the text (7.26:1)
  • AA: or shift the background to #a8a8a8 (4.51:1)
  • AAA: or shift the background to #d1d1d1 (7.03:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #2128ab 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

#2128ab reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

mcpConnect your agent — build around #2128ab
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 #2128ab and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/2128ab-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