# #efff5c

A color — vivid. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#efff5c`
- RGB: rgb(239, 255, 92)
- HSL: hsl(66, 100%, 68%)
- OKLCH: oklch(0.959 0.182 114.7)
- Relative luminance: 0.9064
- Nearest named color: Biohazard Suit (#fbfb4c, Δ 1.71) — https://brandsweets.com/colors/biohazard-suit
- Moods: vivid
- Page: https://brandsweets.com/colors/efff5c

## Tints & shades

- Tints (toward white): #f0ff6b, #f2ff7a, #f3ff8a, #f5ff99, #f6ffa8, #f8ffb8, #f9ffc7, #fbffd6, #fcffe5, #fefff5
- Shades (toward black): #ecff3d, #e8ff1a, #e1fa00, #c1d600, #a5b800, #8a9900, #6a7500, #4e5700, #2e3300, #121400

## Harmonies

- Complementary: #6c5cff
- Analogous: #ffbe5c, #9dff5c
- Triadic: #5cefff, #ff5cef
- Split-complementary: #5c9dff, #be5cff
- Tetradic: #5cffbe, #6c5cff, #ff5c9d

## Colors that go with #efff5c

Named partners (harmony on the OKLCH wheel, co-occurrence in curated palettes and brand systems, and the neutrals that carry it), best first:

- **Plum** #dda0dd [harmony, pool: complementary] — Plum sits directly opposite #efff5c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Blossom (https://brandsweets.com/palettes/light#blossom). — https://brandsweets.com/colors/plum
- **Blue** #0000ff [pool] — 4 real palettes, including Snapchat's brand system and Robinhood's brand system put Blue beside #efff5c, as the supporting colour. Seen in: Snapchat (https://brandsweets.com/colors/brands/snapchat-com), Robinhood (https://brandsweets.com/colors/brands/robinhood-com), Bumble (https://brandsweets.com/colors/brands/bumble-com), Binance (https://brandsweets.com/colors/brands/binance-com). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #efff5c in 5 real palettes, including Ferrari's brand system and Lay's's brand system, as the lead colour. Seen in: Ferrari (https://brandsweets.com/colors/brands/ferrari-com), Lay's (https://brandsweets.com/colors/brands/lays-com), Tequila Sunrise (https://brandsweets.com/palettes/vivid#tequila-sunrise), Diner (https://brandsweets.com/palettes/vivid#diner). — https://brandsweets.com/colors/crimson
- **Red** #ff0000 [pool] — Red is paired with #efff5c in 4 real palettes, including Heineken's brand system and Paddle's brand system, as the accent. Seen in: Heineken (https://brandsweets.com/colors/brands/heineken-com), Paddle (https://brandsweets.com/colors/brands/paddle-com), Phantom: The money app that'll take you placesLogo PhantomLogo PhantomLogo Phantom (https://brandsweets.com/colors/brands/phantom-com), Wise (https://brandsweets.com/colors/brands/wise-com). — https://brandsweets.com/colors/red
- **Taupe** #483c32 [pool] — Taupe is paired with #efff5c in 7 real palettes, including Calvin Klein's brand system and Tommy Hilfiger's brand system, as the lead colour. Seen in: Calvin Klein (https://brandsweets.com/colors/brands/calvinklein-us), Tommy Hilfiger (https://brandsweets.com/colors/brands/tommy-com), Crayon Box (https://brandsweets.com/palettes/playful#crayon-box), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove). — https://brandsweets.com/colors/taupe
- **Violet** #ee82ee [harmony, pool: split] — Violet is a split-complement of #efff5c: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Gumroad (https://brandsweets.com/colors/brands/gumroad-com). — https://brandsweets.com/colors/violet
- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #efff5c: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. Seen in: Zendesk (https://brandsweets.com/colors/brands/zendesk-com), Lagoon (https://brandsweets.com/palettes/vivid#lagoon). — https://brandsweets.com/colors/charcoal
- **Deep Pink** #ff1493 [pool] — 3 real palettes, including JetBrains's brand system and Arcade put Deep Pink beside #efff5c, as the lead colour. Seen in: JetBrains (https://brandsweets.com/colors/brands/jetbrains-com), Arcade (https://brandsweets.com/palettes/vivid#arcade), Night Market (https://brandsweets.com/palettes/vivid#night-market). — https://brandsweets.com/colors/deeppink

## Contrast (WCAG 2.x, as text)

- On white (#ffffff): 1.1:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #6e7a00 (4.72:1); AA: background → #707070 (4.51:1); AAA: text → #535c00 (7.24:1); AAA: background → #525252 (7.12:1)
- On black (#000000): 19.13:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **JetBrains** — accent #fefc4f (Δ 1.954) — https://brandsweets.com/colors/brands/jetbrains-com

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/efff5c-b8bea2-4e86df-262d1f-f1eee9?lock=0&style=vibrant
(Humans lock/regenerate in the tool; the URL is the state — read `lock=` back to see what they kept.)

## Connect an agent

Point any MCP client at the BrandSweets colors endpoint for the same engine:

- Endpoint: https://mcp.brandsweets.com/colors/mcp
- Tools: `analyze_color` (e.g. `analyze_color({ color: "#efff5c" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.