# #81d91c

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

## Values

- Hex: `#81d91c`
- RGB: rgb(129, 217, 28)
- HSL: hsl(88, 77%, 48%)
- OKLCH: oklch(0.799 0.219 133.1)
- Relative luminance: 0.5438
- Nearest named color: yellowgreen (#9acd32, Δ 4.406) — https://brandsweets.com/colors/yellowgreen
- Moods: vivid
- Page: https://brandsweets.com/colors/81d91c

## Tints & shades

- Tints (toward white): #8de32b, #99e641, #a5e958, #b2ec6f, #beef85, #caf29c, #d6f5b2, #e2f8c9, #eefbdf, #fafef6
- Shades (toward black): #76c71a, #69b017, #5e9e15, #508712, #46750f, #3b630d, #2e4d0a, #233b08, #152405, #0b1202

## Harmonies

- Complementary: #741cd9
- Analogous: #d9d21c, #22d91c
- Triadic: #1c81d9, #d91c81
- Split-complementary: #1c22d9, #d21cd9
- Tetradic: #1cd9d2, #741cd9, #d91c22

## Colors that go with #81d91c

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 #81d91c — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. 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
- **Taupe** #483c32 [pool] — Taupe is paired with #81d91c in 8 real palettes, including Acer's brand system and Citrus Grove, as the text colour against it. Seen in: Acer (https://brandsweets.com/colors/brands/acer-com), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove), Minecraft (https://brandsweets.com/colors/brands/minecraft-net), WhatsApp (https://brandsweets.com/colors/brands/whatsapp-com). — https://brandsweets.com/colors/taupe
- **Violet** #ee82ee [harmony: complementary] — Violet sits directly opposite #81d91c 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, pool: split] — Hot Pink is a split-complement of #81d91c: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Terminal (https://brandsweets.com/palettes/technical#terminal). — https://brandsweets.com/colors/hotpink
- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #81d91c: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy. Seen in: Docker (https://brandsweets.com/colors/brands/docker-com). — https://brandsweets.com/colors/charcoal
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #81d91c in 3 real palettes, including Learning App and Citrus Grove, as the accent. Seen in: Learning App (https://brandsweets.com/palettes/playful#learning-app), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove), Playground (https://brandsweets.com/palettes/bold#playground). — https://brandsweets.com/colors/darkorange
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #81d91c in 3 real palettes, including MongoDB's brand system and Brilliant's brand system, as the supporting colour. Seen in: MongoDB (https://brandsweets.com/colors/brands/mongodb-com), Brilliant (https://brandsweets.com/colors/brands/brilliant-org), Docker (https://brandsweets.com/colors/brands/docker-com). — https://brandsweets.com/colors/royalblue
- **Light Coral** #f08080 [harmony, pool: triadic] — Light Coral completes a triad with #81d91c — 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

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

- On white (#ffffff): 1.77:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #4e8311 (4.59:1); AA: background → #4f4f4f (4.63:1); AAA: text → #3b630d (7.06:1); AAA: background → #333333 (7.14:1)
- On black (#000000): 11.88:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **Monster Energy** — primary #95d600 (Δ 1.988) — https://brandsweets.com/colors/brands/monsterenergy-com

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/81d91c-aebea2-4e51df-212d1f-f1f1e9?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: "#81d91c" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.