# #21bcc4

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

## Values

- Hex: `#21bcc4`
- RGB: rgb(33, 188, 196)
- HSL: hsl(183, 71%, 45%)
- OKLCH: oklch(0.725 0.118 200.5)
- Relative luminance: 0.4028
- Nearest named color: Blue Bobbin (#52b4ca, Δ 3.461) — https://brandsweets.com/colors/blue-bobbin
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/21bcc4

## Tints & shades

- Tints (toward white): #25d1da, #3fd6de, #55dbe2, #6be0e6, #85e5ea, #9beaee, #b1eef2, #c6f3f5, #e0f9fa, #f6fdfe
- Shades (toward black): #1eabb3, #1b9ba1, #188a90, #15797e, #12686d, #0f5457, #0c4346, #093234, #062123, #031111

## Harmonies

- Complementary: #c42921
- Analogous: #21c47b, #216bc4
- Triadic: #c421bc, #bcc421
- Split-complementary: #c4216b, #c47b21
- Tetradic: #7b21c4, #c42921, #6bc421

## Colors that go with #21bcc4

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 #21bcc4: softer than #000 and cool enough to feel like part of the same palette. Seen in: Lagoon (https://brandsweets.com/palettes/vivid#lagoon), N26 (https://brandsweets.com/colors/brands/n26-com), Lido (https://brandsweets.com/palettes/vivid#lido), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com). — https://brandsweets.com/colors/charcoal
- **Blue** #0000ff [pool] — 4 real palettes, including Canva's brand system and Warp's brand system put Blue beside #21bcc4, as the accent. Seen in: Canva (https://brandsweets.com/colors/brands/canva-com), Warp (https://brandsweets.com/colors/brands/warp-dev), Unity (https://brandsweets.com/colors/brands/unity-com), Uber (https://brandsweets.com/colors/brands/uber-com). — https://brandsweets.com/colors/blue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #21bcc4: 6 real palettes, including Coca-Cola's brand system and UEFA's brand system, as the accent. Seen in: Coca-Cola (https://brandsweets.com/colors/brands/coca-cola-com), UEFA (https://brandsweets.com/colors/brands/uefa-com), Open House (https://brandsweets.com/palettes/clean#open-house), Venmo (https://brandsweets.com/colors/brands/venmo-com). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #21bcc4: 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), Unity (https://brandsweets.com/colors/brands/unity-com), Venmo (https://brandsweets.com/colors/brands/venmo-com). — https://brandsweets.com/colors/dodgerblue
- **Midnight Blue** #191970 [pool] — 8 real palettes, including Confluent's brand system and Ford's brand system put Midnight Blue beside #21bcc4, 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), First Snow (https://brandsweets.com/palettes/cool#first-snow). — https://brandsweets.com/colors/midnightblue
- **Mustard Yellow** #ffdb58 [pool] — 4 real palettes, including Crayon Box and Lido put Mustard Yellow beside #21bcc4, as the accent. Seen in: Crayon Box (https://brandsweets.com/palettes/playful#crayon-box), Lido (https://brandsweets.com/palettes/vivid#lido), Diner (https://brandsweets.com/palettes/vivid#diner), Fresh Juice (https://brandsweets.com/palettes/playful#fresh-juice). — https://brandsweets.com/colors/mustard
- **Orange** #ffa500 [pool] — 4 real palettes, including Mint Modern and Mistral AI's brand system put Orange beside #21bcc4, as the accent. Seen in: Mint Modern (https://brandsweets.com/palettes/modern#mint-modern), Mistral AI (https://brandsweets.com/colors/brands/mistral-ai), Graphite (https://brandsweets.com/palettes/technical#graphite), Gopro (https://brandsweets.com/colors/brands/gopro-com). — https://brandsweets.com/colors/orange
- **Light Coral** #f08080 [harmony: complementary] — Light Coral sits directly opposite #21bcc4 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/lightcoral

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

- On white (#ffffff): 2.32:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #178287 (4.59:1); AA: background → #3d3d3d (4.68:1); AAA: text → #116064 (7.29:1); AAA: background → #1f1f1f (7.11:1)
- On black (#000000): 9.06:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **Prisma** — primary #00bbcb (Δ 1.239) — https://brandsweets.com/colors/brands/prisma-io
- **Prisma** — secondary #00bbcb (Δ 1.239) — https://brandsweets.com/colors/brands/prisma-io
- **Netlify** — primary #04bcbc (Δ 1.387) — https://brandsweets.com/colors/brands/netlify-com

## 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/21bcc4-a2b9be-d4598e-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: "#21bcc4" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.