Brand gradient

Tumblr gradient

The gradient Tumblr's published colour tokens imply, derived by a pure function of the palette: primary → secondary in OKLab (OKLCH shorter hue when the hues are more than 140° apart; a tonal ramp when they are within ΔE 0.15), then a hero background with an ink that passes AA at the worst point along the line, a button surface with hover and active states, and the variant contact sheet. Same inputs, same gradients, forever — which is what makes them citable; the same values are served as --brand-gradient in the brand's brand.css.

#304058 #36465d #ff4930

Open in the maker Tumblr colors →Full brand page →social

Source: tumblr.com
Extracted: 2 September 2026
Version: 4

Tumblr

white text · worst 4.88:1 · AA

white 4.88 AAblack 1.13 failsbanding high

Hero and button

Hero background

Open in maker →

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). Passes AA for that ink at the worst point (4.90:1) without adjusting L.

white 4.90 AAblack 1.14 failsbanding high

css

linear-gradient(135deg in oklch shorter hue, #6c717b 0%, #3a4048 50%, #0f141b 100%)

tailwind v4

bg-linear-to-br/oklch from-[#6c717b] via-[#3a4048] to-[#0f141b]

Button / CTA

Open in maker →

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 7.82:1).

white 8.87 AAblack 1.72 failsbanding high

Get started

hover

active

label ink passes AA on all three

css

linear-gradient(180deg in oklch shorter hue, #3a4b63 0%, #26364d 100%)

tailwind v4

bg-linear-to-b/oklch from-[#3a4b63] to-[#26364d]

Variants

Tonal ramp

Open in maker →

white 4.88 AAblack 1.13 failsbanding high

css

linear-gradient(135deg in oklch shorter hue, #61728d 0%, #304058 50%, #061328 100%)

tailwind v4

bg-linear-to-br/oklch from-[#61728d] via-[#304058] to-[#061328]

Analogous

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Partner hue from the analogous rule at the source colour's lightness.

white 10.38 AAblack 1.99 failsbanding high

css

linear-gradient(135deg in oklab, #304058 0%, #32424a 100%)

tailwind v4

bg-linear-to-br/oklab from-[#304058] to-[#32424a]

Complementary

Open in maker →

Partner hue from the complementary rule at the source colour's lightness. ΔH 180° > 140° — interpolating in oklch (shorter hue) keeps the midpoint saturated.

white 10.23 AAblack 1.99 failsbanding high

css

linear-gradient(135deg in oklch shorter hue, #304058 0%, #473e30 100%)

tailwind v4

bg-linear-to-br/oklch from-[#304058] to-[#473e30]

Triadic

Open in maker →

Partner hue from the triadic rule at the source colour's lightness.

white 10.46 AAblack 1.94 failsbanding high

css

linear-gradient(135deg in oklab, #304058 0%, #573435 100%)

tailwind v4

bg-linear-to-br/oklab from-[#304058] to-[#573435]

Report — brand gradient

white ink: worst 4.88:1 at 0% (AA); black ink: worst 1.13:1 at 100% (fails AA) → use white text.
Banding high: ~15px bands at 1440px — add grain 31 (≈2% soft-light noise) or shorten the ramp.

Export

The custom properties below are byte-identical to the gradient block in brand.css; the DTCG token is what tokens.json carries.

css custom properties · brand.css

:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 4.88:1 AA, black 1.13:1 */
  --brand-gradient: linear-gradient(135deg in oklch shorter hue, #61728d 0%, #304058 50%, #061328 100%);
  /* hero — worst-case contrast: white 4.90:1 AA, black 1.14:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklch shorter hue, #6c717b 0%, #3a4048 50%, #0f141b 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 8.87:1 AA, black 1.72:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #3a4b63 0%, #26364d 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #42536c 0%, #2d3d55 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #33435b 0%, #1f2e45 100%);
  --brand-gradient-button-ink: #ffffff;
}

svg · brand gradient

<svg xmlns="http://www.w3.org/2000/svg" width="1440" height="600" viewBox="0 0 1440 600"><defs><linearGradient id="bs-gradient" gradientUnits="userSpaceOnUse" x1="210" y1="-210" x2="1230" y2="810"><stop offset="0%" stop-color="#61728d"/><stop offset="3.57%" stop-color="#5d6e89"/><stop offset="7.14%" stop-color="#5a6b85"/><stop offset="10.71%" stop-color="#566781"/><stop offset="14.29%" stop-color="#52637d"/><stop offset="17.86%" stop-color="#4f607a"/><stop offset="21.43%" stop-color="#4b5c76"/><stop offset="25%" stop-color="#485872"/><stop offset="28.57%" stop-color="#44556e"/><stop offset="32.14%" stop-color="#41516a"/><stop offset="35.71%" stop-color="#3d4e67"/><stop offset="39.29%" stop-color="#3a4a63"/><stop offset="42.86%" stop-color="#37475f"/><stop offset="46.43%" stop-color="#33435c"/><stop offset="50%" stop-color="#304058"/><stop offset="53.57%" stop-color="#2d3d54"/><stop offset="57.14%" stop-color="#2a3951"/><stop offset="60.71%" stop-color="#26364d"/><stop offset="64.29%" stop-color="#23334a"/><stop offset="67.86%" stop-color="#202f46"/><stop offset="71.43%" stop-color="#1d2c43"/><stop offset="75%" stop-color="#1a293f"/><stop offset="78.57%" stop-color="#17263c"/><stop offset="82.14%" stop-color="#142239"/><stop offset="85.71%" stop-color="#111f35"/><stop offset="89.29%" stop-color="#0e1c32"/><stop offset="92.86%" stop-color="#0b192f"/><stop offset="96.43%" stop-color="#08162b"/><stop offset="100%" stop-color="#061328"/></linearGradient></defs><rect width="1440" height="600" fill="url(#bs-gradient)"/></svg>

dtcg · tokens.json

{
  "gradient": {
    "brand": {
      "$type": "gradient",
      "$value": [
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.38,
              0.447,
              0.553
            ],
            "hex": "#61728d"
          },
          "position": 0
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.188,
              0.251,
              0.345
            ],
            "hex": "#304058"
          },
          "position": 0.5
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.024,
              0.075,
              0.157
            ],
            "hex": "#061328"
          },
          "position": 1
        }
      ],
      "$extensions": {
        "com.brandsweets": {
          "kind": "linear",
          "css": "linear-gradient(135deg in oklch shorter hue, #61728d 0%, #304058 50%, #061328 100%)",
          "interpolation": "oklch",
          "hue": "shorter",
          "angle": 135,
          "name": "brand",
          "contrast": {
            "white": {
              "ratio": 4.884,
              "at": 0,
              "passesAA": true,
              "passesAALarge": true
            },
            "black": {
              "ratio": 1.132,
              "at": 1,
              "passesAA": false,
              "passesAALarge": false
            },
            "suggestedInk": "#ffffff"
          }
        }
      },
      "$description": "The canonical brand gradient (--brand-gradient)."
    },
    "hero": {
      "$type": "gradient",
      "$value": [
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.424,
              0.443,
              0.482
            ],
            "hex": "#6c717b"
          },
          "position": 0
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.227,
              0.251,
              0.282
            ],
            "hex": "#3a4048"
          },
          "position": 0.5
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.059,
              0.078,
              0.106
            ],
            "hex": "#0f141b"
          },
          "position": 1
        }
      ],
      "$extensions": {
        "com.brandsweets": {
          "kind": "linear",
          "css": "linear-gradient(135deg in oklch shorter hue, #6c717b 0%, #3a4048 50%, #0f141b 100%)",
          "interpolation": "oklch",
          "hue": "shorter",
          "angle": 135,
          "name": "hero",
          "ink": "#ffffff",
          "contrast": {
            "white": {
              "ratio": 4.9,
              "at": 0,
              "passesAA": true,
              "passesAALarge": true
            },
            "black": {
              "ratio": 1.136,
              "at": 1,
              "passesAA": false,
              "passesAALarge": false
            },
            "suggestedInk": "#ffffff"
          }
        }
      },
      "$description": "Low-chroma hero background with a text-safe ink (--brand-gradient-hero)."
    },
    "button": {
      "$type": "gradient",
      "$value": [
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.227,
              0.294,
              0.388
            ],
            "hex": "#3a4b63"
          },
          "position": 0
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.149,
              0.212,
              0.302
            ],
            "hex": "#26364d"
          },
          "position": 1
        }
      ],
      "$extensions": {
        "com.brandsweets": {
          "kind": "linear",
          "css": "linear-gradient(180deg in oklch shorter hue, #3a4b63 0%, #26364d 100%)",
          "interpolation": "oklch",
          "hue": "shorter",
          "angle": 180,
          "name": "button",
          "ink": "#ffffff",
          "states": {
            "hover": "linear-gradient(180deg in oklch shorter hue, #42536c 0%, #2d3d55 100%)",
            "active": "linear-gradient(180deg in oklch shorter hue, #33435b 0%, #1f2e45 100%)"
          },
          "contrast": {
            "white": {
              "ratio": 8.874,
              "at": 0,
              "passesAA": true,
              "passesAALarge": true
            },
            "black": {
              "ratio": 1.717,
              "at": 0.9841,
              "passesAA": false,
              "passesAALarge": false
            },
            "suggestedInk": "#ffffff"
          }
        }
      },
      "$description": "Button / CTA surface with hover and active states (--brand-gradient-button)."
    }
  }
}

Colours

#304058 #36465d #ff4930

mcpConnect your agent — Tumblr's gradients on demand

live endpoint

Point any MCP client at the shared gradients endpoint and your agent gets the same engine as this page — make_gradient returns CSS with the interpolation space, Tailwind v4, SVG, a PNG URL, a DTCG token and the contrast report in one call; brand_gradients derives the whole contact sheet from a brand or a palette. Read-only, no key. Every gradient is a /gradients/new/… link: open it, refine, paste it back.

endpointhttps://mcp.brandsweets.com/gradients/mcp

claude mcp add --transport http brandsweets-gradients https://mcp.brandsweets.com/gradients/mcp

try this prompt

›brand_gradients for tumblr-com — give me the hero CSS and the ink that passes AA, then a version in oklch

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Tumblr and its marks belong to their owner. This page uses the name nominatively to describe gradients derived from the brand's published colour values; it does not reproduce logos or other brand assets, and it is not affiliated with or endorsed by Tumblr. Owner of this brand? Request a correction or removal → Machine-readable: gradients.md