# #04fb21

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

## Values

- Hex: `#04fb21`
- RGB: rgb(4, 251, 33)
- HSL: hsl(127, 97%, 50%)
- OKLCH: oklch(0.857 0.286 143)
- Relative luminance: 0.6913
- Nearest named color: Cyber Neon Green (#00ff26, Δ 1.065) — https://brandsweets.com/colors/cyber-neon-green
- Moods: vivid
- Page: https://brandsweets.com/colors/04fb21

## Tints & shades

- Tints (toward white): #1dfc37, #36fc4d, #4afc5f, #63fd75, #7cfd8b, #96fda2, #affeb8, #c3feca, #dcfee0, #f5fff6
- Shades (toward black): #03e21d, #03ce1b, #03b518, #02a115, #028812, #026f0e, #015a0c, #014108, #012d06, #001403

## Harmonies

- Complementary: #fb04de
- Analogous: #63fb04, #04fb9c
- Triadic: #2104fb, #fb2104
- Split-complementary: #9c04fb, #fb0463
- Tetradic: #0463fb, #fb04de, #fb9c04

## Colors that go with #04fb21

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 #04fb21 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 #04fb21: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/hotpink
- **Plum** #dda0dd [harmony: split] — Plum is a split-complement of #04fb21: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/plum
- **Charcoal** #36454f [role] — Charcoal is the body-text near-black for #04fb21: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. — https://brandsweets.com/colors/charcoal
- **Salmon** #fa8072 [harmony: triadic] — Salmon completes a triad with #04fb21 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. — https://brandsweets.com/colors/salmon
- **Cornflower Blue** #6495ed [harmony: triadic] — Cornflower Blue completes a triad with #04fb21 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. — https://brandsweets.com/colors/cornflowerblue
- **Medium Aquamarine** #66cdaa [harmony: analogous] — Medium Aquamarine is #04fb21'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 #04fb21, 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 → #028812 (4.63:1); AA: background → #5e5e5e (4.58:1); AAA: text → #02640d (7.42:1); AAA: background → #424242 (7.1:1)
- On black (#000000): 14.83:1 — 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/04fb21-a2bea8-aa4edf-1f2d27-ecf1e9?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: "#04fb21" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.