# #128b91

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

## Values

- Hex: `#128b91`
- RGB: rgb(18, 139, 145)
- HSL: hsl(183, 78%, 32%)
- OKLCH: oklch(0.58 0.095 200.4)
- Relative luminance: 0.2064
- Nearest named color: darkcyan (#008b8b, Δ 1.07) — https://brandsweets.com/colors/darkcyan
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/128b91

## Tints & shades

- Tints (toward white): #16a9b1, #19c3cc, #25dbe4, #40dfe7, #60e4eb, #80eaef, #9beef3, #bbf4f7, #d6f8fa, #f6fdfe
- Shades (toward black): #107e84, #0f7176, #0d686d, #0c5b5f, #0a4e52, #084144, #073436, #062b2d, #041e20, #021112

## Harmonies

- Complementary: #911812
- Analogous: #129158, #124b91
- Triadic: #91128b, #8b9112
- Split-complementary: #91124b, #915812
- Tetradic: #581291, #911812, #4b9112

## Colors that go with #128b91

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 #128b91: softer than #000 and cool enough to feel like part of the same palette. Seen in: N26 (https://brandsweets.com/colors/brands/n26-com), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Auth0 (https://brandsweets.com/colors/brands/auth0-com). — https://brandsweets.com/colors/charcoal
- **Copper** #b87333 [harmony, pool: split] — Copper is a split-complement of #128b91: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Riverbed (https://brandsweets.com/palettes/muted#riverbed), Wellness (https://brandsweets.com/palettes/warm#wellness), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty), Atelier (https://brandsweets.com/palettes/elegant#atelier). — https://brandsweets.com/colors/copper
- **Crimson** #dc143c [harmony, pool: complementary] — Crimson sits directly opposite #128b91 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Redfin (https://brandsweets.com/colors/brands/redfin-com), Diner (https://brandsweets.com/palettes/vivid#diner), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Gemstone (https://brandsweets.com/palettes/vivid#gemstone). — https://brandsweets.com/colors/crimson
- **Amber** #ffbf00 [pool] — Amber is paired with #128b91 in 4 real palettes, including Beach Hut and Wired's brand system, as the supporting colour. Seen in: Beach Hut (https://brandsweets.com/palettes/light#beach-hut), Wired (https://brandsweets.com/colors/brands/wired-com), Lemon Squeezy (https://brandsweets.com/colors/brands/lemonsqueezy-com), McDonald's (https://brandsweets.com/colors/brands/mcdonalds-com). — https://brandsweets.com/colors/amber
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #128b91: 6 real palettes, including Intel's brand system and Hershey's's brand system, as the lead colour. Seen in: Intel (https://brandsweets.com/colors/brands/intel-com), Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Glacier (https://brandsweets.com/palettes/cool#glacier), Ink & Paper (https://brandsweets.com/palettes/minimal#ink-and-paper). — https://brandsweets.com/colors/cobalt
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #128b91: 4 real palettes, including Deep Water and Telegram's brand system, as the lead 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), Venmo (https://brandsweets.com/colors/brands/venmo-com). — https://brandsweets.com/colors/deepskyblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #128b91: 13 real palettes, including Peacock and Discover's brand system, as the supporting colour. Seen in: Peacock (https://brandsweets.com/palettes/vivid#peacock), Discover (https://brandsweets.com/colors/brands/discover-com), Campus (https://brandsweets.com/palettes/friendly#campus), Intel (https://brandsweets.com/colors/brands/intel-com). — https://brandsweets.com/colors/denim
- **Firebrick** #b22222 [pool] — Designers have shipped Firebrick with #128b91: 4 real palettes, including Wendy's's brand system and Honda's brand system, as the supporting colour. Seen in: Wendy's (https://brandsweets.com/colors/brands/wendys-com), Honda (https://brandsweets.com/colors/brands/honda-com), AT&T (https://brandsweets.com/colors/brands/att-com), Newsprint (https://brandsweets.com/palettes/editorial#newsprint). — https://brandsweets.com/colors/firebrick

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

- On white (#ffffff): 4.1:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #118288 (4.59:1); AA: background → #121212 (4.57:1); AAA: text → #0c5f64 (7.4:1)
- On black (#000000): 5.13:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #15a5ac (7.01:1)

## 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/128b91-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: "#128b91" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.