# #0399aa

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

## Values

- Hex: `#0399aa`
- RGB: rgb(3, 153, 170)
- HSL: hsl(186, 97%, 34%)
- OKLCH: oklch(0.625 0.107 208.7)
- Relative luminance: 0.257
- Nearest named color: Blue Moon (#3992a8, Δ 2.477) — https://brandsweets.com/colors/blue-moon
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/0399aa

## Tints & shades

- Tints (toward white): #03b5c9, #04d5ec, #13e4fb, #36e8fc, #54ecfc, #72effd, #96f3fd, #b4f6fe, #d7fafe, #f5feff
- Shades (toward black): #028c9c, #027f8d, #02717e, #02646f, #01565f, #014850, #013b41, #012d32, #012023, #001214

## Harmonies

- Complementary: #ab1303
- Analogous: #03ab68, #0346ab
- Triadic: #ab039a, #9aab03
- Split-complementary: #ab0346, #ab6803
- Tetradic: #6803ab, #ab1303, #46ab03

## Colors that go with #0399aa

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 #0399aa: softer than #000 and cool enough to feel like part of the same palette. Seen in: Coastal (https://brandsweets.com/palettes/cool#coastal), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Lido (https://brandsweets.com/palettes/vivid#lido), Beach Hut (https://brandsweets.com/palettes/light#beach-hut). — https://brandsweets.com/colors/charcoal
- **Copper** #b87333 [harmony, pool: split] — Copper is a split-complement of #0399aa: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Dusk (https://brandsweets.com/palettes/cool#dusk), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty), Wellness (https://brandsweets.com/palettes/warm#wellness), Riverbed (https://brandsweets.com/palettes/muted#riverbed). — https://brandsweets.com/colors/copper
- **Red** #ff0000 [harmony, pool: complementary] — Red sits directly opposite #0399aa on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Nike (https://brandsweets.com/colors/brands/nike-com), Wired (https://brandsweets.com/colors/brands/wired-com). — https://brandsweets.com/colors/red
- **Crimson** #dc143c [pool] — Crimson is paired with #0399aa in 5 real palettes, including Diner and Redfin's brand system, as the lead colour. Seen in: Diner (https://brandsweets.com/palettes/vivid#diner), Redfin (https://brandsweets.com/colors/brands/redfin-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Wendy's (https://brandsweets.com/colors/brands/wendys-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #0399aa: 10 real palettes, including Peacock and Gopro's brand system, as the supporting colour. Seen in: Peacock (https://brandsweets.com/palettes/vivid#peacock), Gopro (https://brandsweets.com/colors/brands/gopro-com), Discover (https://brandsweets.com/colors/brands/discover-com), Dusk (https://brandsweets.com/palettes/cool#dusk). — https://brandsweets.com/colors/denim
- **Goldenrod** #daa520 [pool] — Goldenrod shows up next to #0399aa in 4 real palettes, including Ledger Dark and Noir Beauty, as the lead colour. Seen in: Ledger Dark (https://brandsweets.com/palettes/dark#ledger-dark), Noir Beauty (https://brandsweets.com/palettes/dark#noir-beauty), Sapphire & Gold (https://brandsweets.com/palettes/luxury#sapphire-and-gold), Open House (https://brandsweets.com/palettes/clean#open-house). — https://brandsweets.com/colors/goldenrod
- **Midnight Blue** #191970 [pool] — 8 real palettes, including Ford's brand system and SoFi's brand system put Midnight Blue beside #0399aa, as the lead colour. Seen in: Ford (https://brandsweets.com/colors/brands/ford-com), SoFi (https://brandsweets.com/colors/brands/sofi-com), Tide Pool (https://brandsweets.com/palettes/cool#tide-pool), Confluent (https://brandsweets.com/colors/brands/confluent-io). — https://brandsweets.com/colors/midnightblue
- **Royal Blue** #4169e1 [pool] — Royal Blue is paired with #0399aa in 4 real palettes, including Confluent's brand system and Elastic's brand system, as the supporting colour. Seen in: Confluent (https://brandsweets.com/colors/brands/confluent-io), Elastic (https://brandsweets.com/colors/brands/elastic-co), Slate Workspace (https://brandsweets.com/palettes/minimal#slate-workspace), Khan Academy (https://brandsweets.com/colors/brands/khanacademy-org). — https://brandsweets.com/colors/royalblue

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

- On white (#ffffff): 3.42:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #028392 (4.5:1); AA: background → #242424 (4.54:1); AAA: text → #025f69 (7.39:1)
- On black (#000000): 6.14:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #03a8ba (7.31:1)

## 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/0399aa-a2b8be-df4e86-1f262d-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: "#0399aa" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.