Brand gradient

Duolingo gradient

The gradient Duolingo'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.

#58cc02 #a5ed6e

Open in the maker Duolingo colors →Full brand page →

Source: duolingo.com
Extracted: 2 September 2026
Version: 7

Duolingo

black text · worst 5.02:1 · AA

white 1.24 failsblack 5.02 AAbanding high

Hero and button

Hero background

Open in maker →

Chroma ×0.35 so it can carry text; ink black (inkFor at the midpoint). Passes AA for that ink at the worst point (4.83:1) without adjusting L.

white 1.28 failsblack 4.83 AAbanding high

css

linear-gradient(135deg in oklch shorter hue, #ccedc0 0%, #95ba88 50%, #63815d 100%)

tailwind v4

bg-linear-to-br/oklch from-[#ccedc0] via-[#95ba88] to-[#63815d]

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. Black ink passes AA on the surface and both states (worst 7.82:1).

white 1.82 failsblack 8.74 AAbanding high

Get started

hover

active

label ink passes AA on all three

css

linear-gradient(180deg in oklch shorter hue, #66d926 0%, #4abf00 100%)

tailwind v4

bg-linear-to-b/oklch from-[#66d926] to-[#4abf00]

Variants

Tonal ramp

Open in maker →

white 1.24 failsblack 5.02 AAbanding high

css

linear-gradient(135deg in oklch shorter hue, #9eff74 0%, #58cc02 50%, #298f00 100%)

tailwind v4

bg-linear-to-br/oklch from-[#9eff74] via-[#58cc02] to-[#298f00]

Analogous

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

white 2.08 failsblack 9.49 AAbanding high

css

linear-gradient(135deg in oklab, #58cc02 0%, #b9b302 100%)

tailwind v4

bg-linear-to-br/oklab from-[#58cc02] to-[#b9b302]

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 2.00 failsblack 8.45 AAbanding medium

css

linear-gradient(135deg in oklch shorter hue, #58cc02 0%, #e07eff 100%)

tailwind v4

bg-linear-to-br/oklch from-[#58cc02] to-[#e07eff]

Triadic

Open in maker →

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

white 2.08 failsblack 9.34 AAbanding medium

css

linear-gradient(135deg in oklab, #58cc02 0%, #77afff 100%)

tailwind v4

bg-linear-to-br/oklab from-[#58cc02] to-[#77afff]

Report — brand gradient

white ink: worst 1.24:1 at 0% (fails AA); black ink: worst 5.02:1 at 100% (AA) → use black text.
Banding high: ~12px bands at 1440px — add grain 25 (≈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 1.24:1, black 5.02:1 AA */
  --brand-gradient: linear-gradient(135deg in oklch shorter hue, #9eff74 0%, #58cc02 50%, #298f00 100%);
  /* hero — worst-case contrast: white 1.28:1, black 4.83:1 AA; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklch shorter hue, #ccedc0 0%, #95ba88 50%, #63815d 100%);
  --brand-gradient-hero-ink: #000000;
  /* button — worst-case contrast: white 1.82:1, black 8.74:1 AA */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #66d926 0%, #4abf00 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #70e336 0%, #55c900 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #5bcf0f 0%, #3fb500 100%);
  --brand-gradient-button-ink: #000000;
}

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="#9eff74"/><stop offset="3.57%" stop-color="#99fb6e"/><stop offset="7.14%" stop-color="#94f869"/><stop offset="10.71%" stop-color="#90f463"/><stop offset="14.29%" stop-color="#8bf05d"/><stop offset="17.86%" stop-color="#86ed57"/><stop offset="21.43%" stop-color="#81e951"/><stop offset="25%" stop-color="#7ce54b"/><stop offset="28.57%" stop-color="#77e244"/><stop offset="32.14%" stop-color="#72de3d"/><stop offset="35.71%" stop-color="#6dda35"/><stop offset="39.29%" stop-color="#68d72d"/><stop offset="42.86%" stop-color="#63d323"/><stop offset="46.43%" stop-color="#5dd017"/><stop offset="50%" stop-color="#58cc02"/><stop offset="53.57%" stop-color="#55c802"/><stop offset="57.14%" stop-color="#51c303"/><stop offset="60.71%" stop-color="#4ebf03"/><stop offset="64.29%" stop-color="#4aba03"/><stop offset="67.86%" stop-color="#47b603"/><stop offset="71.43%" stop-color="#43b103"/><stop offset="75%" stop-color="#40ad03"/><stop offset="78.57%" stop-color="#3da902"/><stop offset="82.14%" stop-color="#39a402"/><stop offset="85.71%" stop-color="#36a002"/><stop offset="89.29%" stop-color="#339c01"/><stop offset="92.86%" stop-color="#309801"/><stop offset="96.43%" stop-color="#2c9300"/><stop offset="100%" stop-color="#298f00"/></linearGradient></defs><rect width="1440" height="600" fill="url(#bs-gradient)"/></svg>

dtcg · tokens.json

{
  "gradient": {
    "brand": {
      "$type": "gradient",
      "$value": [
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.62,
              1,
              0.455
            ],
            "hex": "#9eff74"
          },
          "position": 0
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.345,
              0.8,
              0.008
            ],
            "hex": "#58cc02"
          },
          "position": 0.5
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.161,
              0.561,
              0
            ],
            "hex": "#298f00"
          },
          "position": 1
        }
      ],
      "$extensions": {
        "com.brandsweets": {
          "kind": "linear",
          "css": "linear-gradient(135deg in oklch shorter hue, #9eff74 0%, #58cc02 50%, #298f00 100%)",
          "interpolation": "oklch",
          "hue": "shorter",
          "angle": 135,
          "name": "brand",
          "contrast": {
            "white": {
              "ratio": 1.235,
              "at": 0,
              "passesAA": false,
              "passesAALarge": false
            },
            "black": {
              "ratio": 5.023,
              "at": 1,
              "passesAA": true,
              "passesAALarge": true
            },
            "suggestedInk": "#000000"
          }
        }
      },
      "$description": "The canonical brand gradient (--brand-gradient)."
    },
    "hero": {
      "$type": "gradient",
      "$value": [
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.8,
              0.929,
              0.753
            ],
            "hex": "#ccedc0"
          },
          "position": 0
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.584,
              0.729,
              0.533
            ],
            "hex": "#95ba88"
          },
          "position": 0.5
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.388,
              0.506,
              0.365
            ],
            "hex": "#63815d"
          },
          "position": 1
        }
      ],
      "$extensions": {
        "com.brandsweets": {
          "kind": "linear",
          "css": "linear-gradient(135deg in oklch shorter hue, #ccedc0 0%, #95ba88 50%, #63815d 100%)",
          "interpolation": "oklch",
          "hue": "shorter",
          "angle": 135,
          "name": "hero",
          "ink": "#000000",
          "contrast": {
            "white": {
              "ratio": 1.277,
              "at": 0,
              "passesAA": false,
              "passesAALarge": false
            },
            "black": {
              "ratio": 4.829,
              "at": 1,
              "passesAA": true,
              "passesAALarge": true
            },
            "suggestedInk": "#000000"
          }
        }
      },
      "$description": "Low-chroma hero background with a text-safe ink (--brand-gradient-hero)."
    },
    "button": {
      "$type": "gradient",
      "$value": [
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.4,
              0.851,
              0.149
            ],
            "hex": "#66d926"
          },
          "position": 0
        },
        {
          "color": {
            "colorSpace": "srgb",
            "components": [
              0.29,
              0.749,
              0
            ],
            "hex": "#4abf00"
          },
          "position": 1
        }
      ],
      "$extensions": {
        "com.brandsweets": {
          "kind": "linear",
          "css": "linear-gradient(180deg in oklch shorter hue, #66d926 0%, #4abf00 100%)",
          "interpolation": "oklch",
          "hue": "shorter",
          "angle": 180,
          "name": "button",
          "ink": "#000000",
          "states": {
            "hover": "linear-gradient(180deg in oklch shorter hue, #70e336 0%, #55c900 100%)",
            "active": "linear-gradient(180deg in oklch shorter hue, #5bcf0f 0%, #3fb500 100%)"
          },
          "contrast": {
            "white": {
              "ratio": 1.823,
              "at": 0,
              "passesAA": false,
              "passesAALarge": false
            },
            "black": {
              "ratio": 8.743,
              "at": 1,
              "passesAA": true,
              "passesAALarge": true
            },
            "suggestedInk": "#000000"
          }
        }
      },
      "$description": "Button / CTA surface with hover and active states (--brand-gradient-button)."
    }
  }
}

Colours

#58cc02 #a5ed6e

mcpConnect your agent — Duolingo'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 duolingo — 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.

Duolingo 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 Duolingo. Owner of this brand? Request a correction or removal → Machine-readable: gradients.md