# #21b6ca

A color — cool, vivid, technical, modern. Deterministic analysis from BrandSweets (no inference).

## Values

- Hex: `#21b6ca`
- RGB: rgb(33, 182, 202)
- HSL: hsl(187, 72%, 46%)
- OKLCH: oklch(0.713 0.117 209.3)
- Relative luminance: 0.3804
- Nearest named color: Aquarius (#2db0ce, Δ 1.991) — https://brandsweets.com/colors/aquarius
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/21b6ca

## Tints & shades

- Tints (toward white): #28c7dc, #3ecde0, #58d4e4, #6ed9e7, #84dfeb, #9ae5ef, #b0eaf2, #caf1f6, #e0f7fa, #f6fdfe
- Shades (toward black): #1ea6b8, #1b96a7, #188391, #15737f, #12636e, #0f535c, #0c434b, #092f35, #062023, #031012

## Harmonies

- Complementary: #ca3521
- Analogous: #21ca89, #2162ca
- Triadic: #ca21b6, #b6ca21
- Split-complementary: #ca2162, #ca8921
- Tetradic: #8921ca, #ca3521, #62ca21

## Colors that go with #21b6ca

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 #21b6ca: softer than #000 and cool enough to feel like part of the same palette. Seen in: Lagoon (https://brandsweets.com/palettes/vivid#lagoon), Lido (https://brandsweets.com/palettes/vivid#lido), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), N26 (https://brandsweets.com/colors/brands/n26-com). — https://brandsweets.com/colors/charcoal
- **Denim** #1560bd [pool] — Designers have shipped Denim with #21b6ca: 6 real palettes, including Coca-Cola's brand system and Venmo's brand system, as the accent. Seen in: Coca-Cola (https://brandsweets.com/colors/brands/coca-cola-com), Venmo (https://brandsweets.com/colors/brands/venmo-com), Open House (https://brandsweets.com/palettes/clean#open-house), Gopro (https://brandsweets.com/colors/brands/gopro-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #21b6ca: 5 real palettes, including Patreon's brand system and Figma's brand system, as the accent. Seen in: Patreon (https://brandsweets.com/colors/brands/patreon-com), Figma (https://brandsweets.com/colors/brands/figma), Venmo (https://brandsweets.com/colors/brands/venmo-com), Opensea (https://brandsweets.com/colors/brands/opensea-io). — https://brandsweets.com/colors/dodgerblue
- **Midnight Blue** #191970 [pool] — 9 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #21b6ca, as the lead colour. Seen in: Confluent (https://brandsweets.com/colors/brands/confluent-io), Ford (https://brandsweets.com/colors/brands/ford-com), SoFi (https://brandsweets.com/colors/brands/sofi-com), Kraken (https://brandsweets.com/colors/brands/kraken-com). — https://brandsweets.com/colors/midnightblue
- **Orange** #ffa500 [pool] — 4 real palettes, including Mistral AI's brand system and Gopro's brand system put Orange beside #21b6ca, as the supporting colour. Seen in: Mistral AI (https://brandsweets.com/colors/brands/mistral-ai), Gopro (https://brandsweets.com/colors/brands/gopro-com), Mint Modern (https://brandsweets.com/palettes/modern#mint-modern), Graphite (https://brandsweets.com/palettes/technical#graphite). — https://brandsweets.com/colors/orange
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #21b6ca in 7 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour. Seen in: Confluent (https://brandsweets.com/colors/brands/confluent-io), Elastic (https://brandsweets.com/colors/brands/elastic-co), Khan Academy (https://brandsweets.com/colors/brands/khanacademy-org), Brilliant (https://brandsweets.com/colors/brands/brilliant-org). — https://brandsweets.com/colors/royalblue
- **Steel Blue** #4682b4 [pool] — Designers have shipped Steel Blue with #21b6ca: 4 real palettes, including Deep Water and Telegram's brand system, as the supporting colour. Seen in: Deep Water (https://brandsweets.com/palettes/dark#deep-water), Telegram (https://brandsweets.com/colors/brands/telegram-org), Astro (https://brandsweets.com/colors/brands/astro-build), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/steelblue
- **Salmon** #fa8072 [harmony: complementary] — Salmon sits directly opposite #21b6ca 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/salmon

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

- On white (#ffffff): 2.44:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #177f8c (4.72:1); AA: background → #3b3b3b (4.59:1); AAA: text → #115f69 (7.33:1); AAA: background → #1a1a1a (7.13:1)
- On black (#000000): 8.61:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **Perplexity** — accent #1fb8cd (Δ 0.616) — https://brandsweets.com/colors/brands/perplexity
- **Prisma** — primary #00bbcb (Δ 1.406) — https://brandsweets.com/colors/brands/prisma-io
- **Prisma** — secondary #00bbcb (Δ 1.406) — https://brandsweets.com/colors/brands/prisma-io
- **Tailwind CSS** — primary #06b6d4 (Δ 1.514) — https://brandsweets.com/colors/brands/tailwind-css

## Curated palettes containing it

- **Circuit** (technical, vivid, bold) — #7c3aed, #0a0a0a, #06b6d4, #ffffff — Violet plus cyan is the current AI-product signal — pair it with pure black type to keep it from going candy. — tool: https://brandsweets.com/palettes/new/7c3aed-0a0a0a-06b6d4-ffffff — collection: https://brandsweets.com/palettes/technical
- **Lagoon** (ocean, vivid, light, summer) — #06b6d4, #14b8a6, #fde68a, #ffffff, #134e4a — Turquoise and teal with a sand-yellow on white — shallow tropical water; the deep teal text is the reef. — tool: https://brandsweets.com/palettes/new/06b6d4-14b8a6-fde68a-ffffff-134e4a — collection: https://brandsweets.com/palettes/ocean

## Fonts for this mood

- technical: https://brandsweets.com/fonts/mood/technical
- modern: https://brandsweets.com/fonts/mood/modern

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/21b6ca-a2b8be-df4e83-1f262d-e9f1ee?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: "#21b6ca" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.