# #21fa00

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

## Values

- Hex: `#21fa00`
- RGB: rgb(33, 250, 0)
- HSL: hsl(112, 100%, 49%)
- OKLCH: oklch(0.855 0.288 142)
- Relative luminance: 0.6869
- Nearest named color: Alien Abduction (#0cff0c, Δ 1.296) — https://brandsweets.com/colors/alien-abduction
- Moods: vivid
- Page: https://brandsweets.com/colors/21fa00

## Tints & shades

- Tints (toward white): #34ff14, #4aff2e, #60ff47, #76ff61, #8cff7a, #9eff8f, #b4ffa8, #caffc2, #e0ffdb, #f6fff5
- Shades (toward black): #1fe600, #1bcc00, #18b800, #159e00, #128a00, #0f7000, #0c5c00, #094200, #062e00, #031400

## Harmonies

- Complementary: #d900fa
- Analogous: #9efa00, #00fa5c
- Triadic: #0021fa, #fa0021
- Split-complementary: #5c00fa, #fa009e
- Tetradic: #009efa, #d900fa, #fa5c00

## Colors that go with #21fa00

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

- **Violet** #ee82ee [harmony: complementary] — Violet sits directly opposite #21fa00 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
- **Deep Sky Blue** #00bfff [harmony, pool: triadic] — Deep Sky Blue completes a triad with #21fa00 — 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). — https://brandsweets.com/colors/deepskyblue
- **Hot Pink** #ff69b4 [harmony: split] — Hot Pink is a split-complement of #21fa00: 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 #21fa00: 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 #21fa00: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/plum
- **Light Coral** #f08080 [harmony: triadic] — Light Coral completes a triad with #21fa00 — 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 #21fa00'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
- **Blue** #0000ff [pool] — MongoDB's brand system puts Blue beside #21fa00, as the accent. Seen in: MongoDB (https://brandsweets.com/colors/brands/mongodb-com). — https://brandsweets.com/colors/blue

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

- On white (#ffffff): 1.42:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #128a00 (4.51:1); AA: background → #5e5e5e (4.55:1); AAA: text → #0e6600 (7.19:1); AAA: background → #424242 (7.05:1)
- On black (#000000): 14.74:1 — AA pass, AA-large pass, AAA pass

## Curated palettes containing it

- **Laser** (neon, vivid, dark, technical) — #39ff14, #bf00ff, #00e5ff, #07070d, #eefaf0 — Laser green, violet and cyan — the synthwave/gaming set; keep the type near-white and let one neon own each screen. — tool: https://brandsweets.com/palettes/new/39ff14-bf00ff-00e5ff-07070d-eefaf0 — collection: https://brandsweets.com/palettes/neon

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/21fa00-a2bea2-864edf-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: "#21fa00" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.