# #21a5c0

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

## Values

- Hex: `#21a5c0`
- RGB: rgb(33, 165, 192)
- HSL: hsl(190, 71%, 44%)
- OKLCH: oklch(0.667 0.112 215.9)
- Relative luminance: 0.3104
- Nearest named color: Blue Ocean (#009dc4, Δ 2.77) — https://brandsweets.com/colors/blue-ocean
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/21a5c0

## Tints & shades

- Tints (toward white): #24b8d6, #3bc3de, #51c9e1, #6bd1e6, #81d8ea, #96dfed, #b1e7f2, #c6eef5, #e0f6fa, #f6fcfe
- Shades (toward black): #1e96ae, #1b879d, #18788c, #15697a, #125a69, #0f4b57, #0c3c46, #092d34, #061e23, #030f11

## Harmonies

- Complementary: #c03b21
- Analogous: #21c08b, #2156c0
- Triadic: #c021a5, #a5c021
- Split-complementary: #c02156, #c08b21
- Tetradic: #8b21c0, #c03b21, #56c021

## Colors that go with #21a5c0

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 #21a5c0: softer than #000 and cool enough to feel like part of the same palette. Seen in: Lido (https://brandsweets.com/palettes/vivid#lido), Lagoon (https://brandsweets.com/palettes/vivid#lagoon), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), N26 (https://brandsweets.com/colors/brands/n26-com). — https://brandsweets.com/colors/charcoal
- **Orange Red** #ff4500 [harmony, pool: complementary] — Orange Red sits directly opposite #21a5c0 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Launch Orange (https://brandsweets.com/palettes/bold#launch-orange), Cursor (https://brandsweets.com/colors/brands/cursor-com), Figma (https://brandsweets.com/colors/brands/figma), Substack (https://brandsweets.com/colors/brands/substack-com). — https://brandsweets.com/colors/orangered
- **Amber** #ffbf00 [pool] — Amber is paired with #21a5c0 in 5 real palettes, including Beach Hut and Salesforce's brand system, as the supporting colour. Seen in: Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Salesforce (https://brandsweets.com/colors/brands/salesforce-com), Blueprint (https://brandsweets.com/palettes/technical#blueprint), NBA (https://brandsweets.com/colors/brands/nba-com). — https://brandsweets.com/colors/amber
- **Crimson** #dc143c [pool] — Crimson is paired with #21a5c0 in 4 real palettes, including Diner and Riot Games's brand system, as the lead colour. Seen in: Diner (https://brandsweets.com/palettes/vivid#diner), Riot Games (https://brandsweets.com/colors/brands/riotgames-com), Redfin (https://brandsweets.com/colors/brands/redfin-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #21a5c0: 7 real palettes, including Gopro's brand system and Coca-Cola's brand system, as the lead colour. Seen in: Gopro (https://brandsweets.com/colors/brands/gopro-com), Coca-Cola (https://brandsweets.com/colors/brands/coca-cola-com), Peacock (https://brandsweets.com/palettes/vivid#peacock), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/denim
- **Dodger Blue** #1e90ff [pool] — Designers have shipped Dodger Blue with #21a5c0: 4 real palettes, including Figma's brand system and Venmo's brand system, as the accent. Seen in: Figma (https://brandsweets.com/colors/brands/figma), Venmo (https://brandsweets.com/colors/brands/venmo-com), Patreon (https://brandsweets.com/colors/brands/patreon-com), Studio Grey (https://brandsweets.com/palettes/minimal#studio-grey). — https://brandsweets.com/colors/dodgerblue
- **Medium Sea Green** #3cb371 [pool] — Medium Sea Green is paired with #21a5c0 in 4 real palettes, including Terminal and Khan Academy's brand system, as the lead colour. Seen in: Terminal (https://brandsweets.com/palettes/technical#terminal), Khan Academy (https://brandsweets.com/colors/brands/khanacademy-org), Olympics (https://brandsweets.com/colors/brands/olympics-com), Unity (https://brandsweets.com/colors/brands/unity-com). — https://brandsweets.com/colors/mediumseagreen
- **Midnight Blue** #191970 [pool] — 10 real palettes, including SoFi's brand system and Ford's brand system put Midnight Blue beside #21a5c0, as the accent. Seen in: SoFi (https://brandsweets.com/colors/brands/sofi-com), Ford (https://brandsweets.com/colors/brands/ford-com), Confluent (https://brandsweets.com/colors/brands/confluent-io), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool). — https://brandsweets.com/colors/midnightblue

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

- On white (#ffffff): 2.91:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #198094 (4.61:1); AA: background → #303030 (4.53:1); AAA: text → #125e6d (7.37:1); AAA: background → #030303 (7.08:1)
- On black (#000000): 7.21:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **SoFi** — secondary #00a2c7 (Δ 1.702) — https://brandsweets.com/colors/brands/sofi-com
- **Ford** — secondary #00a5b5 (Δ 1.921) — https://brandsweets.com/colors/brands/ford-com

## Curated palettes containing it

- **Lido** (summer, vivid, light, playful) — #00a6c7, #ff6b6b, #ffd166, #ffffff, #12303a — Pool blue, watermelon and sun on white — the poolside summer set; the deep teal text keeps it from going juvenile. — tool: https://brandsweets.com/palettes/new/00a6c7-ff6b6b-ffd166-ffffff-12303a — collection: https://brandsweets.com/palettes/summer

## 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/21a5c0-a2b6be-df4e7c-1f252d-e9f1ef?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: "#21a5c0" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.