# #3d99db

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

## Values

- Hex: `#3d99db`
- RGB: rgb(61, 153, 219)
- HSL: hsl(205, 69%, 55%)
- OKLCH: oklch(0.658 0.131 243.6)
- Relative luminance: 0.2889
- Nearest named color: Blue Burst (#309cd0, Δ 2.21) — https://brandsweets.com/colors/blue-burst
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/3d99db

## Tints & shades

- Tints (toward white): #4ea2df, #64aee3, #75b7e6, #86c0e9, #9ccbed, #add4f0, #beddf3, #d0e6f6, #e5f1fa, #f6fafd
- Shades (toward black): #288ed7, #2480c2, #2072ac, #1c6497, #185581, #134467, #0f3652, #0b283c, #071a27, #030b11

## Harmonies

- Complementary: #db7f3d
- Analogous: #3ddbce, #3d4adb
- Triadic: #db3d99, #99db3d
- Split-complementary: #db3d4a, #dbce3d
- Tetradic: #ce3ddb, #db7f3d, #4adb3d

## Colors that go with #3d99db

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 #3d99db: softer than #000 and cool enough to feel like part of the same palette. Seen in: Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), Lido (https://brandsweets.com/palettes/vivid#lido), Blizzard (https://brandsweets.com/colors/brands/blizzard-com), Dusty Blue (https://brandsweets.com/palettes/cool#dusty-blue). — https://brandsweets.com/colors/charcoal
- **Tomato** #ff6347 [harmony, pool: split] — Tomato is a split-complement of #3d99db: 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), Substack (https://brandsweets.com/colors/brands/substack-com), Replit (https://brandsweets.com/colors/brands/replit), Hermès (https://brandsweets.com/colors/brands/hermes-com). — https://brandsweets.com/colors/tomato
- **Bronze** #cd7f32 [harmony, pool: complementary] — Bronze sits directly opposite #3d99db on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Opensea (https://brandsweets.com/colors/brands/opensea-io). — https://brandsweets.com/colors/bronze
- **Amber** #ffbf00 [pool] — Amber is paired with #3d99db in 10 real palettes, including Heatwave and Google's brand system, as the supporting colour. Seen in: Heatwave (https://brandsweets.com/palettes/warm#heatwave), Google (https://brandsweets.com/colors/brands/google-com), Salesforce (https://brandsweets.com/colors/brands/salesforce-com), NBA (https://brandsweets.com/colors/brands/nba-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 7 real palettes, including Unity's brand system and Qualcomm's brand system put Blue beside #3d99db, as the supporting colour. Seen in: Unity (https://brandsweets.com/colors/brands/unity-com), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Cargo (https://brandsweets.com/colors/brands/cargo-site). — https://brandsweets.com/colors/blue
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #3d99db: 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), General Mills (https://brandsweets.com/colors/brands/generalmills-com). — https://brandsweets.com/colors/cobalt
- **Crimson** #dc143c [pool] — Crimson is paired with #3d99db in 4 real palettes, including NASCAR's brand system and Retro Pop, as the supporting colour. Seen in: NASCAR (https://brandsweets.com/colors/brands/nascar-com), Retro Pop (https://brandsweets.com/palettes/playful#retro-pop), JBL (https://brandsweets.com/colors/brands/jbl-com), Riot Games (https://brandsweets.com/colors/brands/riotgames-com). — https://brandsweets.com/colors/crimson
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #3d99db in 4 real palettes, including Elastic's brand system and Learning App, as the lead colour. Seen in: Elastic (https://brandsweets.com/colors/brands/elastic-co), Learning App (https://brandsweets.com/palettes/playful#learning-app), Playground (https://brandsweets.com/palettes/bold#playground), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com). — https://brandsweets.com/colors/darkorange

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

- On white (#ffffff): 3.1:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #227ab9 (4.61:1); AA: background → #2b2b2b (4.57:1); AAA: text → #195b8a (7.23:1)
- On black (#000000): 6.78:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #419cdc (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/3d99db-9cafc4-df4e58-1f212d-e9f1f0?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: "#3d99db" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.