# #3ff31b

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

## Values

- Hex: `#3ff31b`
- RGB: rgb(63, 243, 27)
- HSL: hsl(110, 90%, 53%)
- OKLCH: oklch(0.842 0.272 141.3)
- Relative luminance: 0.6524
- Nearest named color: Becquerel (#4bec13, Δ 1.833) — https://brandsweets.com/colors/becquerel
- Moods: vivid
- Page: https://brandsweets.com/colors/3ff31b

## Tints & shades

- Tints (toward white): #54f434, #64f547, #78f75f, #89f872, #9df98b, #adfa9e, #c2fbb6, #d2fcca, #e7fde2, #f7fef5
- Shades (toward black): #31e90c, #2cd00b, #27b80a, #22a008, #1e8d07, #187406, #135c05, #0e4404, #092c02, #041301

## Harmonies

- Complementary: #cf1bf3
- Analogous: #abf31b, #1bf363
- Triadic: #1b3ff3, #f31b3f
- Split-complementary: #631bf3, #f31bab
- Tetradic: #1babf3, #cf1bf3, #f3631b

## Colors that go with #3ff31b

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 #3ff31b — 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 #3ff31b 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 #3ff31b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/hotpink
- **Charcoal** #36454f [role] — Charcoal is the body-text near-black for #3ff31b: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. — https://brandsweets.com/colors/charcoal
- **Plum** #dda0dd [harmony: split] — Plum is a split-complement of #3ff31b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/plum
- **Red** #ff0000 [pool] — Red is paired with #3ff31b 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
- **Light Coral** #f08080 [harmony: triadic] — Light Coral completes a triad with #3ff31b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. — https://brandsweets.com/colors/lightcoral
- **Medium Aquamarine** #66cdaa [harmony: analogous] — Medium Aquamarine is #3ff31b's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. — https://brandsweets.com/colors/mediumaquamarine

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

- On white (#ffffff): 1.49:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #1d8807 (4.59:1); AA: background → #595959 (4.69:1); AAA: text → #156605 (7.16:1); AAA: background → #3d3d3d (7.27:1)
- On black (#000000): 14.05:1 — 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/3ff31b-a3bea2-814edf-1f2d23-eef1e9?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: "#3ff31b" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.