# #673aa1

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

## Values

- Hex: `#673aa1`
- RGB: rgb(103, 58, 161)
- HSL: hsl(266, 47%, 43%)
- OKLCH: oklch(0.457 0.16 300.2)
- Relative luminance: 0.0848
- Nearest named color: rebeccapurple (#663399, Δ 1.914) — https://brandsweets.com/colors/rebeccapurple
- Moods: cool, modern
- Page: https://brandsweets.com/colors/673aa1

## Tints & shades

- Tints (toward white): #7542b8, #8253c1, #9369c9, #a07cd0, #b092d8, #bea5df, #cebce7, #dcceed, #ece5f6, #faf8fc
- Shades (toward black): #5d3592, #542f83, #4a2a74, #412465, #39205a, #301b4b, #26163c, #1d102d, #130b1e, #0a050f

## Harmonies

- Complementary: #75a13a
- Analogous: #3a41a1, #9a3aa1
- Triadic: #a1673a, #3aa167
- Split-complementary: #a19a3a, #41a13a
- Tetradic: #a13a41, #75a13a, #3aa19a

## Colors that go with #673aa1

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 #673aa1: softer than #000 and cool enough to feel like part of the same palette. Seen in: dbt Labs (https://brandsweets.com/colors/brands/getdbt-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Starlink (https://brandsweets.com/colors/brands/starlink-com). — https://brandsweets.com/colors/charcoal
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #673aa1's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces. Seen in: Wayfair (https://brandsweets.com/colors/brands/wayfair-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com), Guinness (https://brandsweets.com/colors/brands/guinness-com), Carrefour (https://brandsweets.com/colors/brands/carrefour-com). — https://brandsweets.com/colors/royalblue
- **Crimson** #dc143c [pool] — Crimson is paired with #673aa1 in 7 real palettes, including Wells Fargo's brand system and Gemstone, as the lead colour. Seen in: Wells Fargo (https://brandsweets.com/colors/brands/wellsfargo-com), Gemstone (https://brandsweets.com/palettes/vivid#gemstone), Walgreens (https://brandsweets.com/colors/brands/walgreens-com), Lenovo (https://brandsweets.com/colors/brands/lenovo-com). — https://brandsweets.com/colors/crimson
- **Denim** #1560bd [pool] — Designers have shipped Denim with #673aa1: 6 real palettes, including Slack's brand system and Linkedin's brand system, as the lead colour. Seen in: Slack (https://brandsweets.com/colors/brands/slack-com), Linkedin (https://brandsweets.com/colors/brands/linkedin-com), Hinge (https://brandsweets.com/colors/brands/hinge-co), Warbyparker (https://brandsweets.com/colors/brands/warbyparker-com). — https://brandsweets.com/colors/denim
- **Midnight Blue** #191970 [pool] — 7 real palettes, including Kraken's brand system and Blue Mono put Midnight Blue beside #673aa1, as the lead colour. Seen in: Kraken (https://brandsweets.com/colors/brands/kraken-com), Blue Mono (https://brandsweets.com/palettes/cool#blue-mono), Panasonic (https://brandsweets.com/colors/brands/panasonic-com), Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com). — https://brandsweets.com/colors/midnightblue
- **Sea Green** #2e8b57 [harmony, pool: split] — Sea Green is a split-complement of #673aa1: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. Seen in: Jack Daniel's (https://brandsweets.com/colors/brands/jackdaniels-com), Netflix (https://brandsweets.com/colors/brands/netflix), Paramount+ (https://brandsweets.com/colors/brands/paramountplus-com). — https://brandsweets.com/colors/seagreen
- **Taupe** #483c32 [pool] — Taupe is paired with #673aa1 in 4 real palettes, including Datadog's brand system and Superhuman's brand system, as that palette's text colour. Seen in: Datadog (https://brandsweets.com/colors/brands/datadoghq-com), Superhuman (https://brandsweets.com/colors/brands/superhuman-com), Dusk (https://brandsweets.com/palettes/cool#dusk), Nikon (https://brandsweets.com/colors/brands/nikon-com). — https://brandsweets.com/colors/taupe
- **Tomato** #ff6347 [pool] — 5 real palettes, including GitLab's brand system and FedEx's brand system put Tomato beside #673aa1, as the lead colour. Seen in: GitLab (https://brandsweets.com/colors/brands/gitlab), FedEx (https://brandsweets.com/colors/brands/fedex-com), Fivetran blue (https://brandsweets.com/colors/brands/fivetran-com), dbt Labs (https://brandsweets.com/colors/brands/getdbt-com). — https://brandsweets.com/colors/tomato

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

- On white (#ffffff): 7.79:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.7:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #8d62c6 (4.7:1); AA: background → #c7c7c7 (4.61:1); AAA: text → #a887d4 (7.08:1); AAA: background → #f5f5f5 (7.14:1)

## 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/673aa1-b29cc4-dfd74e-2b1f2d-e9eaf1?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: "#673aa1" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.