# Retool gradient

Gradients derived from Retool's published colour tokens (nominative use; no brand assets). Deterministic: the same values are served as `--brand-gradient*` in the brand's brand.css.

- Page: https://brandsweets.com/gradients/brands/retool-com
- Brand colors: https://brandsweets.com/colors/brands/retool-com · Brand page: https://brandsweets.com/b/retool-com
- Palette: primary #242424, secondary #0e352c, accents #518dd2
- Source: https://retool.com (extracted 2026-09-02)

## Brand gradient

ΔE_OK 0.060 < 0.15 between #242424 and #0e352c — a 2-stop would read as a flat fill, so this is a tonal ramp of #242424.

- CSS: `linear-gradient(135deg in oklch shorter hue, #525252 0%, #242424 50%, #020202 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#525252] via-[#242424] to-[#020202]`
- Contrast (worst point): white 7.81:1 AA · black 1.01:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.525252-242424-020202?a=135&in=oklch&hue=shorter

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). Passes AA for that ink at the worst point (7.81:1) without adjusting L.

- CSS: `linear-gradient(135deg in oklch shorter hue, #525252 0%, #242424 50%, #020202 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#525252] via-[#242424] to-[#020202]`
- Contrast (worst point): white 7.81:1 AA · black 1.01:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.525252-242424-020202?a=135&in=oklch&hue=shorter

## Button / CTA

ΔL 0.08 top→bottom in the primary's hue (a lit surface, not a rainbow); hover L +0.03, active L −0.03. White ink passes AA on the surface and both states (worst 12.27:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #2e2e2e 0%, #1b1b1b 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#2e2e2e] to-[#1b1b1b]`
- Contrast (worst point): white 13.58:1 AA · black 1.22:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.2e2e2e-1b1b1b?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #353535 0%, #222222 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #262626 0%, #141414 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #525252 0%, #242424 50%, #020202 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#525252] via-[#242424] to-[#020202]`
- Contrast (worst point): white 7.81:1 AA · black 1.01:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.525252-242424-020202?a=135&in=oklch&hue=shorter

## Analogous

Primary #242424 is achromatic — harmony rotates #0e352c instead. Partner hue from the analogous rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #0e352c 0%, #0e3712 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0e352c] to-[#0e3712]`
- Contrast (worst point): white 13.28:1 AA · black 1.56:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0e352c-0e3712?a=135

## Complementary

Primary #242424 is achromatic — harmony rotates #0e352c instead. Partner hue from the complementary rule at the source colour's lightness. ΔH 180° > 140° — interpolating in oklch (shorter hue) keeps the midpoint saturated.

- CSS: `linear-gradient(135deg in oklch shorter hue, #0e352c 0%, #510f30 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#0e352c] to-[#510f30]`
- Contrast (worst point): white 13.28:1 AA · black 1.45:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0e352c-510f30?a=135&in=oklch&hue=shorter

## Triadic

Primary #242424 is achromatic — harmony rotates #0e352c instead. Partner hue from the triadic rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #0e352c 0%, #351368 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0e352c] to-[#351368]`
- Contrast (worst point): white 13.37:1 AA · black 1.44:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0e352c-351368?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 7.81:1 AA, black 1.01:1 */
  --brand-gradient: linear-gradient(135deg in oklch shorter hue, #525252 0%, #242424 50%, #020202 100%);
  /* hero — worst-case contrast: white 7.81:1 AA, black 1.01:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklch shorter hue, #525252 0%, #242424 50%, #020202 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 13.58:1 AA, black 1.22:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #2e2e2e 0%, #1b1b1b 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #353535 0%, #222222 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #262626 0%, #141414 100%);
  --brand-gradient-button-ink: #ffffff;
}
```

## Gradient maker

Every maker URL is the gradient's state: `/gradients/new/v1.<hex>-<hex>[_pos]?a=135&in=oklch&hue=shorter&e=soft&g=8`. Hand one to a human, let them refine, and read the link they return.

## Connect an agent

Point any MCP client at the BrandSweets gradients endpoint for the same engine and corpus:

- Endpoint: https://mcp.brandsweets.com/gradients/mcp
- Tools: `make_gradient` (2–5 colours → CSS with the interpolation space, Tailwind v4, SVG, PNG URL, DTCG token + the contrast/banding/gamut report), `brand_gradients` (brand slug or palette → brand gradient, hero, button, variants).
- Resource: `gradients://corpus` — the whole bundled corpus as JSON.