# #21b404

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

## Values

- Hex: `#21b404`
- RGB: rgb(33, 180, 4)
- HSL: hsl(110, 96%, 36%)
- OKLCH: oklch(0.67 0.222 141.6)
- Relative luminance: 0.3297
- Nearest named color: Green Glimmer (#00bb00, Δ 2.003) — https://brandsweets.com/colors/green-glimmer
- Moods: vivid
- Page: https://brandsweets.com/colors/21b404

## Tints & shades

- Tints (toward white): #27d204, #2cf005, #43fa1e, #5cfb3c, #75fc5a, #8efc78, #a7fd96, #c4feb9, #defed7, #f7fff5
- Shades (toward black): #1ea503, #1c9603, #188203, #157302, #126402, #105502, #0d4601, #093201, #062301, #041400

## Harmonies

- Complementary: #9704b4
- Analogous: #79b404, #04b43e
- Triadic: #0421b4, #b40421
- Split-complementary: #3e04b4, #b40479
- Tetradic: #0479b4, #9704b4, #b43e04

## Colors that go with #21b404

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

- **Taupe** #483c32 [pool] — Taupe is paired with #21b404 in 8 real palettes, including Obsidian's brand system and Meadow, as the text colour against it. Seen in: Obsidian (https://brandsweets.com/colors/brands/obsidian-md), Meadow (https://brandsweets.com/palettes/light#meadow), Acer (https://brandsweets.com/colors/brands/acer-com), Minecraft (https://brandsweets.com/colors/brands/minecraft-net). — https://brandsweets.com/colors/taupe
- **Fuchsia** #ff00ff [harmony: complementary] — Fuchsia sits directly opposite #21b404 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/fuchsia
- **Medium Purple** #9370db [harmony, pool: split] — Medium Purple is a split-complement of #21b404: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Obsidian (https://brandsweets.com/colors/brands/obsidian-md), Next.js (https://brandsweets.com/colors/brands/nextjs-org). — https://brandsweets.com/colors/mediumpurple
- **Blue** #0000ff [pool] — 3 real palettes, including Spotify's brand system and Minecraft's brand system put Blue beside #21b404, as the accent. Seen in: Spotify (https://brandsweets.com/colors/brands/spotify), Minecraft (https://brandsweets.com/colors/brands/minecraft-net), Unity (https://brandsweets.com/colors/brands/unity-com). — https://brandsweets.com/colors/blue
- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #21b404: 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), Mint Modern (https://brandsweets.com/palettes/modern#mint-modern). — https://brandsweets.com/colors/charcoal
- **Cornflower Blue** #6495ed [harmony, pool: triadic] — Cornflower Blue completes a triad with #21b404 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Spotify (https://brandsweets.com/colors/brands/spotify), Terminal (https://brandsweets.com/palettes/technical#terminal). — https://brandsweets.com/colors/cornflowerblue
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #21b404 in 3 real palettes, including Playground and Learning App, as the lead colour. Seen in: Playground (https://brandsweets.com/palettes/bold#playground), Learning App (https://brandsweets.com/palettes/playful#learning-app), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove). — https://brandsweets.com/colors/darkorange
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #21b404: 3 real palettes, including Playground and Unity's brand system, as the supporting colour. Seen in: Playground (https://brandsweets.com/palettes/bold#playground), Unity (https://brandsweets.com/colors/brands/unity-com), Spline (https://brandsweets.com/colors/brands/spline-design). — https://brandsweets.com/colors/dodgerblue

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

- On white (#ffffff): 2.77:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #198703 (4.66:1); AA: background → #333333 (4.57:1); AAA: text → #126402 (7.37:1); AAA: background → #0d0d0d (7.03:1)
- On black (#000000): 7.59:1 — 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/21b404-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: "#21b404" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.