# #21877c

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

## Values

- Hex: `#21877c`
- RGB: rgb(33, 135, 124)
- HSL: hsl(174, 61%, 33%)
- OKLCH: oklch(0.565 0.091 184.2)
- Relative luminance: 0.1911
- Nearest named color: Emerald Whispers (#2b8478, Δ 0.941) — https://brandsweets.com/colors/emerald-whispers
- Moods: vivid
- Page: https://brandsweets.com/colors/21877c

## Tints & shades

- Tints (toward white): #28a498, #2ebdaf, #3ed0c2, #57d6c9, #73ddd3, #8ce3da, #a9eae4, #c1f0eb, #def7f5, #f7fdfc
- Shades (toward black): #1e7b72, #1b6f66, #18635b, #155650, #134e48, #10423d, #0d3531, #0a2926, #071d1b, #04100f

## Harmonies

- Complementary: #87212b
- Analogous: #21874a, #215e87
- Triadic: #7d2187, #877d21
- Split-complementary: #87215e, #874a21
- Tetradic: #4a2187, #87212b, #5e8721

## Colors that go with #21877c

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 #21877c: softer than #000 and cool enough to feel like part of the same palette. Seen in: N26 (https://brandsweets.com/colors/brands/n26-com), Gusto (https://brandsweets.com/colors/brands/gusto-com), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Asana (https://brandsweets.com/colors/brands/asana-com). — https://brandsweets.com/colors/charcoal
- **Medium Violet Red** #c71585 [harmony, pool: complementary] — Medium Violet Red sits directly opposite #21877c on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Bun (https://brandsweets.com/colors/brands/bun-sh). — https://brandsweets.com/colors/mediumvioletred
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #21877c: 5 real palettes, including Intel's brand system and Ink & Paper, as the lead colour. Seen in: Intel (https://brandsweets.com/colors/brands/intel-com), Ink & Paper (https://brandsweets.com/palettes/minimal#ink-and-paper), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust), Glacier (https://brandsweets.com/palettes/cool#glacier). — https://brandsweets.com/colors/cobalt
- **Copper** #b87333 [pool] — Designers have shipped Copper with #21877c: 6 real palettes, including Wellness and Riverbed, as the supporting colour. Seen in: Wellness (https://brandsweets.com/palettes/warm#wellness), Riverbed (https://brandsweets.com/palettes/muted#riverbed), Clay & Linen (https://brandsweets.com/palettes/warm#clay-and-linen), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty). — https://brandsweets.com/colors/copper
- **Crimson** #dc143c [pool] — Crimson is paired with #21877c in 8 real palettes, including Redfin's brand system and Gemstone, as the lead colour. Seen in: Redfin (https://brandsweets.com/colors/brands/redfin-com), Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Five Guys (https://brandsweets.com/colors/brands/fiveguys-com), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #21877c: 10 real palettes, including Peacock and Intel's brand system, as the supporting colour. Seen in: Peacock (https://brandsweets.com/palettes/vivid#peacock), Intel (https://brandsweets.com/colors/brands/intel-com), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Netflix (https://brandsweets.com/colors/brands/netflix). — https://brandsweets.com/colors/denim
- **Goldenrod** #daa520 [pool] — Goldenrod shows up next to #21877c in 5 real palettes, including Mid-Century and Sapphire & Gold, as the accent. Seen in: Mid-Century (https://brandsweets.com/palettes/warm#mid-century), Sapphire & Gold (https://brandsweets.com/palettes/luxury#sapphire-and-gold), Noir Beauty (https://brandsweets.com/palettes/dark#noir-beauty), Ledger Dark (https://brandsweets.com/palettes/dark#ledger-dark). — https://brandsweets.com/colors/goldenrod
- **Midnight Blue** #191970 [pool] — 7 real palettes, including Tide Pool and Paramount+'s brand system put Midnight Blue beside #21877c, as that palette's text colour. Seen in: Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com), Discover (https://brandsweets.com/colors/brands/discover-com), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/midnightblue

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

- On white (#ffffff): 4.36:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #208379 (4.58:1); AA: background → #0a0a0a (4.55:1); AAA: text → #18635b (7.06:1)
- On black (#000000): 4.82:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #29a89c (7.18:1)

## Palette tool

Open this color locked as the lead with four explored companions: https://brandsweets.com/palettes/new/21877c-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: "#21877c" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.