# #51cd99

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

## Values

- Hex: `#51cd99`
- RGB: rgb(81, 205, 153)
- HSL: hsl(155, 55%, 56%)
- OKLCH: oklch(0.765 0.135 162.5)
- Relative luminance: 0.4771
- Nearest named color: mediumaquamarine (#66cdaa, Δ 3.04) — https://brandsweets.com/colors/mediumaquamarine
- Moods: neutral
- Page: https://brandsweets.com/colors/51cd99

## Tints & shades

- Tints (toward white): #61d1a2, #71d6ac, #84dbb7, #94e0c0, #a4e5ca, #b4e9d3, #c4eedc, #d7f4e8, #e7f8f1, #f7fdfa
- Shades (toward black): #3dc78e, #35b680, #2e9e6f, #288a61, #227754, #1d6346, #174f38, #103727, #0a2419, #05100b

## Harmonies

- Complementary: #cd5185
- Analogous: #51cd5b, #51c2cd
- Triadic: #9951cd, #cd9951
- Split-complementary: #cd51c2, #cd5b51
- Tetradic: #5b51cd, #cd5185, #c2cd51

## Colors that go with #51cd99

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

- **Charcoal** #36454f [role, pool] — Charcoal is the text near-black for #51cd99: softer than #000 and cool enough to feel like part of the same palette. Seen in: Docker (https://brandsweets.com/colors/brands/docker-com), Mint Modern (https://brandsweets.com/palettes/modern#mint-modern), Canopy (https://brandsweets.com/palettes/cool#canopy), Lagoon (https://brandsweets.com/palettes/vivid#lagoon). — https://brandsweets.com/colors/charcoal
- **Hot Pink** #ff69b4 [harmony, pool: complementary] — Hot Pink sits directly opposite #51cd99 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Terminal (https://brandsweets.com/palettes/technical#terminal). — https://brandsweets.com/colors/hotpink
- **Blue** #0000ff [pool] — 5 real palettes, including Unity's brand system and Minecraft's brand system put Blue beside #51cd99, as the supporting colour. Seen in: Unity (https://brandsweets.com/colors/brands/unity-com), Minecraft (https://brandsweets.com/colors/brands/minecraft-net), Canva (https://brandsweets.com/colors/brands/canva-com), Spotify (https://brandsweets.com/colors/brands/spotify). — https://brandsweets.com/colors/blue
- **Crimson** #dc143c [pool] — Crimson is paired with #51cd99 in 4 real palettes, including DuckDuckGo's brand system and Tiffany & Co.'s brand system, as the supporting colour. Seen in: DuckDuckGo (https://brandsweets.com/colors/brands/duckduckgo-com), Tiffany & Co. (https://brandsweets.com/colors/brands/tiffany-com), Formula 1 (https://brandsweets.com/colors/brands/formula1-com), Riot Games (https://brandsweets.com/colors/brands/riotgames-com). — https://brandsweets.com/colors/crimson
- **Mustard Yellow** #ffdb58 [pool] — 4 real palettes, including Fresh Juice and Crayon Box put Mustard Yellow beside #51cd99, as the supporting colour. Seen in: Fresh Juice (https://brandsweets.com/palettes/playful#fresh-juice), Crayon Box (https://brandsweets.com/palettes/playful#crayon-box), Meadow (https://brandsweets.com/palettes/light#meadow), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove). — https://brandsweets.com/colors/mustard
- **Taupe** #483c32 [pool] — Taupe is paired with #51cd99 in 19 real palettes, including Chime's brand system and WhatsApp's brand system, as the lead colour. Seen in: Chime (https://brandsweets.com/colors/brands/chime-com), WhatsApp (https://brandsweets.com/colors/brands/whatsapp-com), Crayon Box (https://brandsweets.com/palettes/playful#crayon-box), Obsidian (https://brandsweets.com/colors/brands/obsidian-md). — https://brandsweets.com/colors/taupe
- **Wheat** #f5deb3 [pool] — Designers have shipped Wheat with #51cd99: 4 real palettes, including Resort and Mint Chip, as the accent. Seen in: Resort (https://brandsweets.com/palettes/light#resort), Mint Chip (https://brandsweets.com/palettes/light#mint-chip), Pine & Birch (https://brandsweets.com/palettes/clean#pine-and-birch), Oatly (https://brandsweets.com/colors/brands/oatly-com). — https://brandsweets.com/colors/wheat
- **Light Coral** #f08080 [harmony, pool: split] — Light Coral is a split-complement of #51cd99: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Meadow (https://brandsweets.com/palettes/light#meadow). — https://brandsweets.com/colors/lightcoral

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

- On white (#ffffff): 1.99:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #27865f (4.5:1); AA: background → #474747 (4.66:1); AAA: text → #1d6346 (7.18:1); AAA: background → #2b2b2b (7.11:1)
- On black (#000000): 10.54:1 — 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/51cd99-a2beb6-d459c8-1f2d2d-e9f1ea?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: "#51cd99" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.