# #309dbb

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

## Values

- Hex: `#309dbb`
- RGB: rgb(48, 157, 187)
- HSL: hsl(193, 59%, 46%)
- OKLCH: oklch(0.649 0.105 220.5)
- Relative luminance: 0.2833
- Nearest named color: Blue Ocean (#009dc4, Δ 1.779) — https://brandsweets.com/colors/blue-ocean
- Moods: cool, modern
- Page: https://brandsweets.com/colors/309dbb

## Tints & shades

- Tints (toward white): #38accc, #4db4d1, #65bed7, #79c7dc, #8dcfe2, #a2d8e7, #b6e0ec, #ceebf2, #e3f3f8, #f7fcfd
- Shades (toward black): #2c8faa, #28819a, #237086, #1e6376, #1a5565, #164755, #123a45, #0d2931, #081b20, #040e10

## Harmonies

- Complementary: #bb4e30
- Analogous: #30bb93, #3057bb
- Triadic: #bb309d, #9dbb30
- Split-complementary: #bb3057, #bb9330
- Tetradic: #9330bb, #bb4e30, #57bb30

## Colors that go with #309dbb

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 #309dbb: softer than #000 and cool enough to feel like part of the same palette. Seen in: Lido (https://brandsweets.com/palettes/vivid#lido), Dusty Blue (https://brandsweets.com/palettes/cool#dusty-blue), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), Beach Hut (https://brandsweets.com/palettes/light#beach-hut). — https://brandsweets.com/colors/charcoal
- **Amber** #ffbf00 [pool] — Amber is paired with #309dbb in 6 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), Salesforce (https://brandsweets.com/colors/brands/salesforce-com), Blueprint (https://brandsweets.com/palettes/technical#blueprint). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 4 real palettes, including Canva's brand system and Qualcomm's brand system put Blue beside #309dbb, as the accent. Seen in: Canva (https://brandsweets.com/colors/brands/canva-com), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Unity (https://brandsweets.com/colors/brands/unity-com). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #309dbb: 4 real palettes, including Blue Mono and Hershey's's brand system, as the lead colour. Seen in: Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Hershey's (https://brandsweets.com/colors/brands/hersheys-com), Glacier (https://brandsweets.com/palettes/cool#glacier), Fintech Trust (https://brandsweets.com/palettes/cool#fintech-trust). — https://brandsweets.com/colors/cobalt
- **Copper** #b87333 [pool] — Designers have shipped Copper with #309dbb: 4 real palettes, including Dusk and Notion's brand system, as the accent. Seen in: Dusk (https://brandsweets.com/palettes/cool#dusk), Notion (https://brandsweets.com/colors/brands/notion), Atelier (https://brandsweets.com/palettes/elegant#atelier), Clean Beauty (https://brandsweets.com/palettes/minimal#clean-beauty). — https://brandsweets.com/colors/copper
- **Crimson** #dc143c [pool] — Crimson is paired with #309dbb in 6 real palettes, including Diner and Retro Pop, as the lead colour. Seen in: Diner (https://brandsweets.com/palettes/vivid#diner), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), Redfin (https://brandsweets.com/colors/brands/redfin-com), NASCAR (https://brandsweets.com/colors/brands/nascar-com). — https://brandsweets.com/colors/crimson
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #309dbb: 6 real palettes, including Telegram's brand system and Snowflake AI Data Cloud's brand system, as the lead colour. Seen in: Telegram (https://brandsweets.com/colors/brands/telegram-org), Snowflake AI Data Cloud (https://brandsweets.com/colors/brands/snowflake-com), Remix (https://brandsweets.com/colors/brands/remix-run), Figma (https://brandsweets.com/colors/brands/figma). — https://brandsweets.com/colors/deepskyblue
- **Chocolate** #d2691e [harmony: complementary] — Chocolate sits directly opposite #309dbb 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/chocolate

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

- On white (#ffffff): 3.15:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #277e96 (4.66:1); AA: background → #292929 (4.62:1); AAA: text → #1d5f72 (7.16:1)
- On black (#000000): 6.67:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #32a3c3 (7.16:1)

## Fonts for this mood

- 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/309dbb-a2b5be-df4e75-1f242d-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: "#309dbb" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.