# #21e421

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

## Values

- Hex: `#21e421`
- RGB: rgb(33, 228, 33)
- HSL: hsl(120, 78%, 51%)
- OKLCH: oklch(0.799 0.262 142.6)
- Relative luminance: 0.5592
- Nearest named color: Alarming Slime (#2ce335, Δ 1.098) — https://brandsweets.com/colors/alarming-slime
- Moods: vivid
- Page: https://brandsweets.com/colors/21e421

## Tints & shades

- Tints (toward white): #37e637, #49e949, #60eb60, #77ee77, #8ef18e, #a0f3a0, #b6f6b6, #cdf9cd, #dffbdf, #f6fef6
- Shades (toward black): #1ad11a, #18bf18, #15a815, #129112, #107f10, #0d680d, #0a520a, #073b07, #052905, #021202

## Harmonies

- Complementary: #e421e4
- Analogous: #82e421, #21e482
- Triadic: #2121e4, #e42121
- Split-complementary: #8221e4, #e42182
- Tetradic: #2182e4, #e421e4, #e48221

## Colors that go with #21e421

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 #21e421 in 7 real palettes, including 7-Eleven's brand system and WhatsApp's brand system, as the lead colour. Seen in: 7-Eleven (https://brandsweets.com/colors/brands/7-eleven-com), WhatsApp (https://brandsweets.com/colors/brands/whatsapp-com), Minecraft (https://brandsweets.com/colors/brands/minecraft-net), Obsidian (https://brandsweets.com/colors/brands/obsidian-md). — https://brandsweets.com/colors/taupe
- **Violet** #ee82ee [harmony: complementary] — Violet sits directly opposite #21e421 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
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #21e421 in 3 real palettes, including Learning App and Playground, as the accent. Seen in: Learning App (https://brandsweets.com/palettes/playful#learning-app), Playground (https://brandsweets.com/palettes/bold#playground), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove). — https://brandsweets.com/colors/darkorange
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #21e421: 3 real palettes, including Learning App and Remix's brand system, as the supporting colour. Seen in: Learning App (https://brandsweets.com/palettes/playful#learning-app), Remix (https://brandsweets.com/colors/brands/remix-run), Prime Video (https://brandsweets.com/colors/brands/primevideo-com). — https://brandsweets.com/colors/deepskyblue
- **Light Coral** #f08080 [harmony, pool: triadic] — Light Coral completes a triad with #21e421 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Meadow (https://brandsweets.com/palettes/light#meadow). — https://brandsweets.com/colors/lightcoral
- **Hot Pink** #ff69b4 [harmony: split] — Hot Pink is a split-complement of #21e421: 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 #21e421: 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 #21e421: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. — https://brandsweets.com/colors/charcoal

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

- On white (#ffffff): 1.72:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #118811 (4.61:1); AA: background → #525252 (4.53:1); AAA: text → #0c640c (7.38:1); AAA: background → #363636 (7.01:1)
- On black (#000000): 12.18:1 — 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/21e421-a2bea5-994edf-1f2d25-edf1e9?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: "#21e421" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.