brandsweets

Color

#eff312

#eff312
hex#eff312
rgbrgb(239, 243, 18)
hslhsl(61, 90%, 51%)
oklchoklch(0.93 0.202 111)
Closest name: Banana Bandanna (#f8f739)Relative luminance 0.825
Vivid
Open in palette toolCheck contrast

Tints & shades

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

Harmonies

Complementary

Open in tool →
eff3121512f3

#1512f3

Analogous

Open in tool →
eff312f386127ef312

#f38612 · #7ef312

Triadic

Open in tool →
eff31212eff3f312ef

#12eff3 · #f312ef

Split-complementary

Open in tool →
eff312127ef38612f3

#127ef3 · #8612f3

Tetradic

Open in tool →
eff31212f3861512f3f3127e

#12f386 · #1512f3 · #f3127e

Contrast

#eff312 as textRatioAAAA largeAAAFix
Aaon white
1.2:1failfailfail
  • AA: use #777906 as the text (4.64:1)
  • AAA: use #5b5c05 as the text (7.05:1)
  • AA: or shift the background to #696969 (4.57:1)
  • AAA: or shift the background to #4d4d4d (7.04:1)
Aaon black
17.5:1passpasspassPasses AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #eff312 as the background.

Brands using this color

mcpConnect your agent — build around #eff312
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 #eff312 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/eff312-babea2-4e92df-272d1f-f1ede9?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