# #5900b3

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

## Values

- Hex: `#5900b3`
- RGB: rgb(89, 0, 179)
- HSL: hsl(270, 100%, 35%)
- OKLCH: oklch(0.408 0.225 294.4)
- Relative luminance: 0.0538
- Nearest named color: Intergalactic Settlement (#5b1e8b, Δ 6.894) — https://brandsweets.com/colors/intergalactic-settlement
- Moods: cool, vivid, technical, modern
- Page: https://brandsweets.com/colors/5900b3

## Tints & shades

- Tints (toward white): #6900d1, #7a00f5, #8a14ff, #9933ff, #ab57ff, #ba75ff, #c994ff, #d9b3ff, #ebd6ff, #faf5ff
- Shades (toward black): #5200a3, #4a0094, #420085, #3b0075, #330066, #290052, #210042, #1a0033, #120024, #0a0014

## Harmonies

- Complementary: #59b300
- Analogous: #0000b3, #b300b3
- Triadic: #b35900, #00b359
- Split-complementary: #b3b300, #00b300
- Tetradic: #b30000, #59b300, #00b3b3

## Colors that go with #5900b3

Named partners (harmony on the OKLCH wheel, co-occurrence in curated palettes and brand systems, and the neutrals that carry it), best first:

- **Olive Green** #808000 [harmony: complementary] — Olive Green sits directly opposite #5900b3 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/olive
- **Charcoal** #36454f [role, pool] — Charcoal is the text near-black for #5900b3: 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). — https://brandsweets.com/colors/charcoal
- **Cobalt Blue** #0047ab [pool] — Designers have shipped Cobalt Blue with #5900b3: 3 real palettes, including Zillow's brand system and Unilever's brand system, as the supporting colour. Seen in: Zillow (https://brandsweets.com/colors/brands/zillow-com), Unilever (https://brandsweets.com/colors/brands/unilever-com), Tide (https://brandsweets.com/colors/brands/tide-com). — https://brandsweets.com/colors/cobalt
- **Tomato** #ff6347 [pool] — 3 real palettes, including dbt Labs's brand system and FedEx's brand system put Tomato beside #5900b3, as the lead colour. Seen in: dbt Labs (https://brandsweets.com/colors/brands/getdbt-com), FedEx (https://brandsweets.com/colors/brands/fedex-com), GitLab (https://brandsweets.com/colors/brands/gitlab). — https://brandsweets.com/colors/tomato
- **Teal** #008080 [harmony, pool: triadic] — Teal completes a triad with #5900b3 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash. Seen in: Gemstone (https://brandsweets.com/palettes/vivid#gemstone). — https://brandsweets.com/colors/teal
- **Forest Green** #228b22 [harmony: split] — Forest Green is a split-complement of #5900b3: nearly opposite, so it still pops against it, without the vibrating edge of a true complement. — https://brandsweets.com/colors/forestgreen
- **Royal Blue** #4169e1 [harmony, pool: analogous] — Royal Blue is #5900b3'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). — https://brandsweets.com/colors/royalblue
- **Blue Violet** #8a2be2 [pool] — Blue Violet is paired with #5900b3 in two real palettes: Twitch's brand system and Taco Bell's brand system, as the lead colour. Seen in: Twitch (https://brandsweets.com/colors/brands/twitch-tv), Taco Bell (https://brandsweets.com/colors/brands/tacobell-com). — https://brandsweets.com/colors/blueviolet

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

- On white (#ffffff): 10.12:1 — AA pass, AA-large pass, AAA pass
- On black (#000000): 2.08:1 — AA fail, AA-large fail, AAA fail. Fix: AA: text → #9e3dff (4.57:1); AA: background → #adadad (4.51:1); AAA: text → #ba75ff (7.08:1); AAA: background → #d9d9d9 (7.17:1)

## Brands using this color

- **Zillow** — accent #6000b6 (Δ 1.531) — https://brandsweets.com/colors/brands/zillow-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/5900b3-b59cc4-c9cb62-2c1f2d-eae9f1?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: "#5900b3" })`), `check_contrast` (with fixes), `generate_palette` (explore around locks), `suggest_palette` (mood/industry → curated-first), `list_palettes`.