# #51e665

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

## Values

- Hex: `#51e665`
- RGB: rgb(81, 230, 101)
- HSL: hsl(128, 75%, 61%)
- OKLCH: oklch(0.818 0.213 145.5)
- Relative luminance: 0.5928
- Nearest named color: Grotesque Green (#64e986, Δ 3.93) — https://brandsweets.com/colors/grotesque-green
- Moods: vivid
- Page: https://brandsweets.com/colors/51e665

## Tints & shades

- Tints (toward white): #63e975, #70eb81, #82ed90, #94f0a0, #a6f2b0, #b3f4bc, #c5f7cc, #d7f9db, #e4fbe7, #f6fef7
- Shades (toward black): #36e24d, #20df39, #1cc432, #18aa2c, #159326, #11781f, #0d5e18, #0a4311, #062d0b, #031205

## Harmonies

- Complementary: #e651d2
- Analogous: #88e651, #51e6af
- Triadic: #6551e6, #e66551
- Split-complementary: #af51e6, #e65188
- Tetradic: #5188e6, #e651d2, #e6af51

## Colors that go with #51e665

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 [pool] — Designers have shipped Deep Sky Blue with #51e665: 4 real palettes, including Remix's brand system and Prime Video's brand system, as the lead colour. Seen in: Remix (https://brandsweets.com/colors/brands/remix-run), Prime Video (https://brandsweets.com/colors/brands/primevideo-com), Learning App (https://brandsweets.com/palettes/playful#learning-app), Astro (https://brandsweets.com/colors/brands/astro-build). — https://brandsweets.com/colors/deepskyblue
- **Taupe** #483c32 [pool] — Taupe is paired with #51e665 in 9 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), Acer (https://brandsweets.com/colors/brands/acer-com). — https://brandsweets.com/colors/taupe
- **Violet** #ee82ee [harmony: complementary] — Violet sits directly opposite #51e665 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
- **Charcoal** #36454f [role, pool] — Charcoal is the body-text near-black for #51e665: 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 #51e665 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
- **Mustard Yellow** #ffdb58 [pool] — 3 real palettes, including Fresh Juice and Citrus Grove put Mustard Yellow beside #51e665, as the supporting colour. Seen in: Fresh Juice (https://brandsweets.com/palettes/playful#fresh-juice), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove), Meadow (https://brandsweets.com/palettes/light#meadow). — https://brandsweets.com/colors/mustard
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #51e665 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
- **Hot Pink** #ff69b4 [harmony: split] — Hot Pink is a split-complement of #51e665: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/hotpink

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

- On white (#ffffff): 1.63:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #138622 (4.71:1); AA: background → #545454 (4.64:1); AAA: text → #0f671a (7.06:1); AAA: background → #383838 (7.18:1)
- On black (#000000): 12.86:1 — 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/51e665-a2bea9-ac4edf-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: "#51e665" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.