brandsweets

Color

#100ce9

#100ce9
hex#100ce9
rgbrgb(16, 12, 233)
hslhsl(241, 90%, 48%)
oklchoklch(0.429 0.288 265.5)
Closest name: Burning Ultrablue (#150aec)Relative luminance 0.0626
CoolVividTechnicalModern
Open in palette toolCheck contrastWhat goes with it ↓

Colors that go with #100ce9

Charcoal, Crimson and Cobalt 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.

Real palettes that use #100ce9

Activision· brandAlaska Airlines· brandBBC· brandBinance· brand

Tints & shades

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

Harmonies

Complementary

Open in tool →
100ce9e5e90c

#e5e90c

Analogous

Open in tool →
100ce90c77e97e0ce9

#0c77e9 · #7e0ce9

Triadic

Open in tool →
100ce9e9100c0ce910

#e9100c · #0ce910

Split-complementary

Open in tool →
100ce9e97e0c77e90c

#e97e0c · #77e90c

Tetradic

Open in tool →
100ce9e90c77e5e90c0ce97e

#e90c77 · #e5e90c · #0ce97e

Contrast

#100ce9 as textRatioAAAA largeAAAFix
Aaon white
9.33:1passpasspassPasses AAA — no fix needed.
Aaon black
2.25:1failfailfail
  • AA: use #6664f7 as the text (4.73:1)
  • AAA: use #8d8bf9 as the text (7.19:1)
  • AA: or shift the background to #b5b5b5 (4.55:1)
  • AAA: or shift the background to #e0e0e0 (7.07:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #100ce9 as the background.

Brands using this color

Fonts for this mood

#100ce9 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:

Technical fonts →Modern fonts →
mcpConnect your agent — build around #100ce9
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 #100ce9 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/100ce9-a19cc4-df9b4e-261f2d-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