# #4ef31b

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

## Values

- Hex: `#4ef31b`
- RGB: rgb(78, 243, 27)
- HSL: hsl(106, 90%, 53%)
- OKLCH: oklch(0.845 0.268 140.4)
- Relative luminance: 0.658
- Nearest named color: Becquerel (#4bec13, Δ 1.924) — https://brandsweets.com/colors/becquerel
- Moods: vivid
- Page: https://brandsweets.com/colors/4ef31b

## Tints & shades

- Tints (toward white): #60f434, #70f547, #82f75f, #92f872, #a4f98b, #b4fa9e, #c6fbb6, #d5fcca, #e8fde2, #f7fef5
- Shades (toward black): #40e90c, #39d00b, #32b80a, #2ca008, #268d07, #207406, #195c05, #134404, #0c2c02, #051301

## Harmonies

- Complementary: #c11bf3
- Analogous: #b9f31b, #1bf355
- Triadic: #1b4ef3, #f31b4e
- Split-complementary: #551bf3, #f31bb9
- Tetradic: #1bb9f3, #c11bf3, #f3551b

## Colors that go with #4ef31b

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

- **Deep Sky Blue** #00bfff [harmony, pool: triadic] — Deep Sky Blue completes a triad with #4ef31b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Remix (https://brandsweets.com/colors/brands/remix-run), Learning App (https://brandsweets.com/palettes/playful#learning-app), Prime Video (https://brandsweets.com/colors/brands/primevideo-com). — https://brandsweets.com/colors/deepskyblue
- **Violet** #ee82ee [harmony: complementary] — Violet sits directly opposite #4ef31b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. — https://brandsweets.com/colors/violet
- **Hot Pink** #ff69b4 [harmony: split] — Hot Pink is a split-complement of #4ef31b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/hotpink
- **Blue** #0000ff [pool] — Two real palettes: MongoDB's brand system and Robinhood's brand system put Blue beside #4ef31b, as the accent. Seen in: MongoDB (https://brandsweets.com/colors/brands/mongodb-com), Robinhood (https://brandsweets.com/colors/brands/robinhood-com). — https://brandsweets.com/colors/blue
- **Charcoal** #36454f [role] — Charcoal is the body-text near-black for #4ef31b: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. — https://brandsweets.com/colors/charcoal
- **Red** #ff0000 [pool] — Red is paired with #4ef31b in two real palettes: Gatorade's brand system and Wise's brand system, as the supporting colour. Seen in: Gatorade (https://brandsweets.com/colors/brands/gatorade-com), Wise (https://brandsweets.com/colors/brands/wise-com). — https://brandsweets.com/colors/red
- **Lilac** #c8a2c8 [harmony: split] — Lilac is a split-complement of #4ef31b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/lilac
- **Light Coral** #f08080 [harmony: triadic] — Light Coral completes a triad with #4ef31b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. — https://brandsweets.com/colors/lightcoral

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

- On white (#ffffff): 1.48:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #258807 (4.56:1); AA: background → #5c5c5c (4.51:1); AAA: text → #1c6605 (7.11:1); AAA: background → #3d3d3d (7.32:1)
- On black (#000000): 14.16:1 — AA pass, AA-large pass, AAA pass

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/4ef31b-a5bea2-774edf-1f2d22-eff1e9?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: "#4ef31b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.