# #21ca91

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

## Values

- Hex: `#21ca91`
- RGB: rgb(33, 202, 145)
- HSL: hsl(160, 72%, 46%)
- OKLCH: oklch(0.745 0.154 163.5)
- Relative luminance: 0.4461
- Nearest named color: Emerald Green (#50c878, Δ 3.269) — https://brandsweets.com/colors/emerald-green
- Moods: vivid
- Page: https://brandsweets.com/colors/21ca91

## Tints & shades

- Tints (toward white): #28dca0, #3ee0aa, #58e4b5, #6ee7bf, #84ebc9, #9aefd2, #b0f2dc, #caf6e8, #e0faf1, #f6fefb
- Shades (toward black): #1eb885, #1ba778, #189168, #157f5c, #126e4f, #0f5c42, #0c4b36, #093526, #062319, #03120d

## Harmonies

- Complementary: #ca2159
- Analogous: #21ca3d, #21aeca
- Triadic: #9121ca, #ca9121
- Split-complementary: #ca21ae, #ca3d21
- Tetradic: #3d21ca, #ca2159, #aeca21

## Colors that go with #21ca91

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 #21ca91: 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), Lagoon (https://brandsweets.com/palettes/vivid#lagoon), N26 (https://brandsweets.com/colors/brands/n26-com). — https://brandsweets.com/colors/charcoal
- **Hot Pink** #ff69b4 [harmony, pool: complementary] — Hot Pink sits directly opposite #21ca91 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] — 4 real palettes, including Unity's brand system and Minecraft's brand system put Blue beside #21ca91, as the supporting colour. Seen in: Unity (https://brandsweets.com/colors/brands/unity-com), Minecraft (https://brandsweets.com/colors/brands/minecraft-net), Spotify (https://brandsweets.com/colors/brands/spotify), Canva (https://brandsweets.com/colors/brands/canva-com). — https://brandsweets.com/colors/blue
- **Mustard Yellow** #ffdb58 [pool] — 4 real palettes, including Fresh Juice and Meadow put Mustard Yellow beside #21ca91, as the supporting colour. Seen in: Fresh Juice (https://brandsweets.com/palettes/playful#fresh-juice), Meadow (https://brandsweets.com/palettes/light#meadow), Crayon Box (https://brandsweets.com/palettes/playful#crayon-box), Citrus Grove (https://brandsweets.com/palettes/warm#citrus-grove). — https://brandsweets.com/colors/mustard
- **Taupe** #483c32 [pool] — Taupe is paired with #21ca91 in 15 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), Obsidian (https://brandsweets.com/colors/brands/obsidian-md), Meadow (https://brandsweets.com/palettes/light#meadow). — https://brandsweets.com/colors/taupe
- **Light Coral** #f08080 [harmony, pool: split] — Light Coral is a split-complement of #21ca91: 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
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #21ca91: 3 real palettes, including Terminal and Spotify's brand system, as the supporting colour. Seen in: Terminal (https://brandsweets.com/palettes/technical#terminal), Spotify (https://brandsweets.com/colors/brands/spotify), Canva (https://brandsweets.com/colors/brands/canva-com). — https://brandsweets.com/colors/cornflowerblue
- **Dark Olive Green** #556b2f [pool] — Dark Olive Green shows up next to #21ca91 in 3 real palettes, including Undergrowth and 7-Eleven's brand system, as the supporting colour. Seen in: Undergrowth (https://brandsweets.com/palettes/dark#undergrowth), 7-Eleven (https://brandsweets.com/colors/brands/7-eleven-com), Forest Floor (https://brandsweets.com/palettes/dark#forest-floor). — https://brandsweets.com/colors/darkolivegreen

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

- On white (#ffffff): 2.12:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #15845f (4.67:1); AA: background → #454545 (4.53:1); AAA: text → #106549 (7.05:1); AAA: background → #262626 (7.15:1)
- On black (#000000): 9.92:1 — 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/21ca91-a2beb8-d459be-1f2c2d-e9f1eb?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: "#21ca91" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.