# #21ab9d

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

## Values

- Hex: `#21ab9d`
- RGB: rgb(33, 171, 157)
- HSL: hsl(174, 68%, 40%)
- OKLCH: oklch(0.669 0.112 184.2)
- Relative luminance: 0.3188
- Nearest named color: Billiard (#00af9f, Δ 1.158) — https://brandsweets.com/colors/billiard
- Moods: vivid
- Page: https://brandsweets.com/colors/21ab9d

## Tints & shades

- Tints (toward white): #26c5b5, #31d8c7, #47dccd, #60e1d4, #7ae6db, #94ebe2, #aeefe9, #c3f4ef, #ddf8f6, #f6fdfd
- Shades (toward black): #1d9a8e, #1b8d82, #187c72, #156f66, #125e57, #0f4d47, #0c403b, #092f2b, #07221f, #031110

## Harmonies

- Complementary: #ab212f
- Analogous: #21ab58, #2174ab
- Triadic: #9d21ab, #ab9d21
- Split-complementary: #ab2174, #ab5821
- Tetradic: #5821ab, #ab212f, #74ab21

## Colors that go with #21ab9d

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 #21ab9d: softer than #000 and cool enough to feel like part of the same palette. Seen in: N26 (https://brandsweets.com/colors/brands/n26-com), Lagoon (https://brandsweets.com/palettes/vivid#lagoon), Coastal (https://brandsweets.com/palettes/cool#coastal), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool). — https://brandsweets.com/colors/charcoal
- **Cornflower Blue** #6495ed [pool] — Designers have shipped Cornflower Blue with #21ab9d: 4 real palettes, including Canva's brand system and Arctic, as the supporting colour. Seen in: Canva (https://brandsweets.com/colors/brands/canva-com), Arctic (https://brandsweets.com/palettes/clean#arctic), Spotify (https://brandsweets.com/colors/brands/spotify), Terminal (https://brandsweets.com/palettes/technical#terminal). — https://brandsweets.com/colors/cornflowerblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #21ab9d: 4 real palettes, including Peacock and Open House, as the supporting colour. Seen in: Peacock (https://brandsweets.com/palettes/vivid#peacock), Open House (https://brandsweets.com/palettes/clean#open-house), Dusk (https://brandsweets.com/palettes/cool#dusk), Gopro (https://brandsweets.com/colors/brands/gopro-com). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 7 real palettes, including Ford's brand system and Tide Pool put Midnight Blue beside #21ab9d, as the lead colour. Seen in: Ford (https://brandsweets.com/colors/brands/ford-com), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Confluent (https://brandsweets.com/colors/brands/confluent-io). — https://brandsweets.com/colors/midnightblue
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #21ab9d in 6 real palettes, including Khan Academy's brand system and Confluent's brand system, as the accent. Seen in: Khan Academy (https://brandsweets.com/colors/brands/khanacademy-org), Confluent (https://brandsweets.com/colors/brands/confluent-io), Brilliant (https://brandsweets.com/colors/brands/brilliant-org), Console Light (https://brandsweets.com/palettes/technical#console-light). — https://brandsweets.com/colors/royalblue
- **Taupe** #483c32 [pool] — Taupe is paired with #21ab9d in 14 real palettes, including Resort and Rain Garden, as the text colour against it. Seen in: Resort (https://brandsweets.com/palettes/light#resort), Rain Garden (https://brandsweets.com/palettes/cool#rain-garden), Undergrowth (https://brandsweets.com/palettes/dark#undergrowth), Polaroid (https://brandsweets.com/palettes/light#polaroid). — https://brandsweets.com/colors/taupe
- **Deep Pink** #ff1493 [harmony: complementary] — Deep Pink sits directly opposite #21ab9d 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/deeppink
- **Tomato** #ff6347 [harmony, pool: split] — Tomato is a split-complement of #21ab9d: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Lido (https://brandsweets.com/palettes/vivid#lido), Crayon Box (https://brandsweets.com/palettes/playful#crayon-box). — https://brandsweets.com/colors/tomato

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

- On white (#ffffff): 2.85:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #188176 (4.73:1); AA: background → #303030 (4.64:1); AAA: text → #13635b (7.09:1); AAA: background → #080808 (7.04:1)
- On black (#000000): 7.38:1 — 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/21ab9d-a2bebe-d459a1-1f292d-e9f1ed?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: "#21ab9d" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.