# #678def

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

## Values

- Hex: `#678def`
- RGB: rgb(103, 141, 239)
- HSL: hsl(223, 81%, 67%)
- OKLCH: oklch(0.661 0.152 266.3)
- Relative luminance: 0.2817
- Nearest named color: cornflowerblue (#6495ed, Δ 2.171) — https://brandsweets.com/colors/cornflowerblue
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/678def

## Tints & shades

- Tints (toward white): #7598f0, #82a2f2, #90acf3, #9eb7f5, #b1c4f7, #becff8, #ccd9fa, #dae3fb, #e8eefd, #f6f8fe
- Shades (toward black): #4b79ec, #2b61e9, #174fde, #1446c2, #113ca6, #0e3086, #0b266a, #081c4e, #05112e, #020712

## Harmonies

- Complementary: #efc867
- Analogous: #67d1ef, #8467ef
- Triadic: #ef678d, #8def67
- Split-complementary: #ef8467, #d1ef67
- Tetradic: #ef67d1, #efc867, #67ef84

## Colors that go with #678def

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 #678def: softer than #000 and cool enough to feel like part of the same palette. Seen in: Blizzard (https://brandsweets.com/colors/brands/blizzard-com), Plaid (https://brandsweets.com/colors/brands/plaid-com), Lamborghini (https://brandsweets.com/colors/brands/lamborghini-com), Dusty Blue (https://brandsweets.com/palettes/cool#dusty-blue). — https://brandsweets.com/colors/charcoal
- **Medium Sea Green** #3cb371 [harmony, pool: triadic] — Medium Sea Green completes a triad with #678def — 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), Spotify (https://brandsweets.com/colors/brands/spotify), Olympics (https://brandsweets.com/colors/brands/olympics-com). — https://brandsweets.com/colors/mediumseagreen
- **Tomato** #ff6347 [harmony, pool: triadic] — Tomato completes a triad with #678def — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Replit (https://brandsweets.com/colors/brands/replit), Substack (https://brandsweets.com/colors/brands/substack-com), Abstract (https://brandsweets.com/colors/brands/abstract-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com). — https://brandsweets.com/colors/tomato
- **Amber** #ffbf00 [pool] — Amber is paired with #678def in 9 real palettes, including Blueprint and Google's brand system, as the accent. Seen in: Blueprint (https://brandsweets.com/palettes/technical#blueprint), Google (https://brandsweets.com/colors/brands/google-com), Mastodon hosted on mastodon.social (https://brandsweets.com/colors/brands/mastodon-social), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com). — https://brandsweets.com/colors/amber
- **Blue** #0000ff [pool] — 11 real palettes, including Qualcomm's brand system and Unity's brand system put Blue beside #678def, as the accent. Seen in: Qualcomm (https://brandsweets.com/colors/brands/qualcomm-com), Unity (https://brandsweets.com/colors/brands/unity-com), Readymag (https://brandsweets.com/colors/brands/readymag-com), Canva (https://brandsweets.com/colors/brands/canva-com). — https://brandsweets.com/colors/blue
- **Dark Orange** #ff8c00 [pool] — Dark Orange shows up next to #678def in 4 real palettes, including Playground and Ahrefs's brand system, as the lead colour. Seen in: Playground (https://brandsweets.com/palettes/bold#playground), Ahrefs (https://brandsweets.com/colors/brands/ahrefs-com), Elastic (https://brandsweets.com/colors/brands/elastic-co), Learning App (https://brandsweets.com/palettes/playful#learning-app). — https://brandsweets.com/colors/darkorange
- **Deep Sky Blue** #00bfff [pool] — Designers have shipped Deep Sky Blue with #678def: 8 real palettes, including Blueprint and Figma's brand system, as the lead colour. Seen in: Blueprint (https://brandsweets.com/palettes/technical#blueprint), Figma (https://brandsweets.com/colors/brands/figma), Venmo (https://brandsweets.com/colors/brands/venmo-com), Patreon (https://brandsweets.com/colors/brands/patreon-com). — https://brandsweets.com/colors/deepskyblue
- **Denim** #1560bd [pool] — Designers have shipped Denim with #678def: 13 real palettes, including Apple's brand system and Coursera's brand system, as the accent. Seen in: Apple (https://brandsweets.com/colors/brands/apple-com), Coursera (https://brandsweets.com/colors/brands/coursera-org), Venmo (https://brandsweets.com/colors/brands/venmo-com), Gopro (https://brandsweets.com/colors/brands/gopro-com). — https://brandsweets.com/colors/denim

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

- On white (#ffffff): 3.17:1 — AA fail, AA-large pass, AAA fail. Fix: AA: text → #3d6eeb (4.54:1); AA: background → #292929 (4.6:1); AAA: text → #164ad0 (7.18:1)
- On black (#000000): 6.63:1 — AA pass, AA-large pass, AAA fail. Fix: AAA: text → #7094f0 (7.18:1)

## 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/678def-9ca3c4-df704e-211f2d-e9eff1?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: "#678def" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.