# #3399ff

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

## Values

- Hex: `#3399ff`
- RGB: rgb(51, 153, 255)
- HSL: hsl(210, 100%, 60%)
- OKLCH: oklch(0.676 0.176 252.3)
- Relative luminance: 0.3071
- Nearest named color: Fresh Blue of Bel Air (#069af3, Δ 2.407) — https://brandsweets.com/colors/fresh-blue-of-bel-air
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/3399ff

## Tints & shades

- Tints (toward white): #47a3ff, #5cadff, #6bb5ff, #80bfff, #94c9ff, #a8d4ff, #bddeff, #cce6ff, #e0f0ff, #f5faff
- Shades (toward black): #148aff, #007dfa, #006edb, #0061c2, #0052a3, #004285, #00366b, #00264d, #001a33, #000a14

## Harmonies

- Complementary: #ff9933
- Analogous: #33ffff, #3333ff
- Triadic: #ff3399, #99ff33
- Split-complementary: #ff3333, #ffff33
- Tetradic: #ff33ff, #ff9933, #33ff33

## Colors that go with #3399ff

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 #3399ff: softer than #000 and cool enough to feel like part of the same palette. Seen in: Blizzard (https://brandsweets.com/colors/brands/blizzard-com), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), Lido (https://brandsweets.com/palettes/vivid#lido), Disney (https://brandsweets.com/colors/brands/disney-com). — https://brandsweets.com/colors/charcoal
- **Medium Sea Green** #3cb371 [harmony, pool: triadic] — Medium Sea Green completes a triad with #3399ff — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Unity (https://brandsweets.com/colors/brands/unity-com), Terminal (https://brandsweets.com/palettes/technical#terminal), Olympics (https://brandsweets.com/colors/brands/olympics-com), Spotify (https://brandsweets.com/colors/brands/spotify). — https://brandsweets.com/colors/mediumseagreen
- **Tomato** #ff6347 [harmony, pool: split] — Tomato is a split-complement of #3399ff: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Replit (https://brandsweets.com/colors/brands/replit), Abstract (https://brandsweets.com/colors/brands/abstract-com), Substack (https://brandsweets.com/colors/brands/substack-com), Lido (https://brandsweets.com/palettes/vivid#lido). — https://brandsweets.com/colors/tomato
- **Peru** #cd853f [harmony, pool: complementary] — Peru sits directly opposite #3399ff on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight. Seen in: Guinness (https://brandsweets.com/colors/brands/guinness-com). — https://brandsweets.com/colors/peru
- **Amber** #ffbf00 [pool] — Amber is paired with #3399ff in 8 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), NBA (https://brandsweets.com/colors/brands/nba-com), Salesforce (https://brandsweets.com/colors/brands/salesforce-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 12 real palettes, including Unity's brand system and Readymag's brand system put Blue beside #3399ff, as the supporting colour. Seen in: Unity (https://brandsweets.com/colors/brands/unity-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Cargo (https://brandsweets.com/colors/brands/cargo-site). — https://brandsweets.com/colors/blue
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #3399ff in 4 real palettes, including Playground and Elastic's brand system, as the lead colour. Seen in: Playground (https://brandsweets.com/palettes/bold#playground), Elastic (https://brandsweets.com/colors/brands/elastic-co), Learning App (https://brandsweets.com/palettes/playful#learning-app), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com). — https://brandsweets.com/colors/darkorange
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #3399ff: 6 real palettes, including Figma's brand system and Venmo's brand system. Seen in: Figma (https://brandsweets.com/colors/brands/figma), Venmo (https://brandsweets.com/colors/brands/venmo-com), Remix (https://brandsweets.com/colors/brands/remix-run), Patreon (https://brandsweets.com/colors/brands/patreon-com). — https://brandsweets.com/colors/deepskyblue

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

- On white (#ffffff): 2.94:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #0073e6 (4.57:1); AA: background → #2e2e2e (4.62:1); AAA: text → #0057ad (7.08:1); AAA: background → #030303 (7.01:1)
- On black (#000000): 7.14:1 — AA pass, AA-large pass, AAA pass

## Brands using this color

- **AMD** — secondary #2899ff (Δ 0.513) — https://brandsweets.com/colors/brands/amd-com
- **Apple** — secondary #2997ff (Δ 0.789) — https://brandsweets.com/colors/brands/apple-com
- **Figma** — accent #0d99ff (Δ 1.273) — https://brandsweets.com/colors/brands/figma
- **Miro** — accent #0099ff (Δ 1.454) — https://brandsweets.com/colors/brands/miro-com

## 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/3399ff-9cabc4-df514e-1f202d-e9f1f1?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: "#3399ff" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.