Colour to colour · generated

Medium Sea Green to Royal Blue gradient

Medium Sea Green (#3cb371) into Royal Blue (#4169e1) — 111° apart on the OKLCH hue wheel. Below: the same two stops interpolated in OKLab and in OKLCH, side by side, because the difference is real and most generators never let you see it; then an eased version and a mesh, each with the worst-case contrast for white and black text. The engine's own pick for this pair is oklab — both colours are in the palette and the hue gap is small enough that the straight line stays clean.

Medium Sea Green → Royal Blue
black text · worst 4.33:1 · AA large
white 2.66 failsblack 4.33 AA largebanding high

OKLab and OKLCH, side by side

Aa

A straight line through the a/b plane: the two hues meet halfway and desaturate a little at the midpoint. The safe default — it is what CSS and Tailwind default to.

white 2.66 failsblack 4.33 AA largebanding high
css
linear-gradient(135deg in oklab, #3cb371 0%, #4169e1 100%)
Aa

OKLCH (shorter hue)

Open in maker →

Chroma and hue interpolate separately, so the midpoint keeps its saturation and the hue travels the short way round the wheel — richer, and it can pass through hues neither colour has.

white 2.67 failsblack 4.33 AA largebanding high
css
linear-gradient(135deg in oklch shorter hue, #3cb371 0%, #4169e1 100%)

And the sRGB line most tools draw, for comparison — the number is the chroma that survives at the dullest point.

sRGB50%
OKLab55%
OKLCH66%

Eased and mesh

Aa

Eased (soft)

Open in maker →

A cubic-bezier(.4, 0, .6, 1) mix ratio baked into 15 stops: the transition lingers on each colour and moves faster through the middle, which is what makes a gradient read as designed rather than default.

white 2.66 failsblack 4.33 AA largebanding high
css
linear-gradient(135deg in oklab, #3cb371 0%, #3cb273 8.28%, #3bb079 16.03%, #39ac82 23.35%, #38a78d 30.32%, #37a198 37.03%, #369ba4 43.56%, #3693b0 50%, #378cbb 56.44%, #3984c5 62.97%, #3b7cce 69.68%, #3d75d6 76.65%, #3f6fdc 83.97%, #416be0 91.72%, #4169e1 100%)
Aa

Both colours as stacked radials over a base, laid out by a seeded Poisson-disc sampler — the same seed gives the same mesh forever. Exports as CSS, SVG and PNG.

white 3.19 AA largeblack 5.46 AAbanding low
css
background-color: #3693b0;
background-image: radial-gradient(circle farthest-corner at 18.41% 72.19%, rgba(65, 105, 225, 0.744) 0%, rgba(65, 105, 225, 0) 53.37%), radial-gradient(circle farthest-corner at 85.04% 53.41%, rgba(60, 179, 113, 0.828) 0%, rgba(60, 179, 113, 0) 46.34%);
background-image: radial-gradient(circle farthest-corner at 18.41% 72.19%, oklch(from #4169e1 l c h / 0.7437) 0%, rgb(from #4169e1 r g b / 0) 53.37%), radial-gradient(circle farthest-corner at 85.04% 53.41%, oklch(from #3cb371 l c h / 0.8276) 0%, rgb(from #3cb371 r g b / 0) 46.34%);

Report

  • white ink: worst 2.66:1 at 1% (fails AA); black ink: worst 4.33:1 at 100% (AA-large only) → use black text.
  • Body text fails AA everywhere on this gradient; large text (≥24px / 19px bold) is fine. Add a scrim or lower the chroma for body copy.
  • Banding high: ~13px bands at 1440px — add grain 27 (≈2% soft-light noise) or shorten the ramp.

Export

css
.gradient {
  background-image: linear-gradient(135deg, #3cb371 0%, #3aaf7c 7.14%, #39ab86 14.29%, #38a68f 21.43%, #37a298 28.57%, #369da0 35.71%, #3698a8 42.86%, #3693b0 50%, #378eb7 57.14%, #3889bf 64.29%, #3983c6 71.43%, #3b7dcd 78.57%, #3d77d4 85.71%, #3f70da 92.86%, #4169e1 100%);
  background-image: linear-gradient(135deg in oklab, #3cb371 0%, #4169e1 100%);
}
tailwind v4
bg-linear-to-br/oklab from-[#3cb371] to-[#4169e1]
svg
<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="#3cb371"/><stop offset="7.14%" stop-color="#3aaf7c"/><stop offset="14.29%" stop-color="#39ab86"/><stop offset="21.43%" stop-color="#38a68f"/><stop offset="28.57%" stop-color="#37a298"/><stop offset="35.71%" stop-color="#369da0"/><stop offset="42.86%" stop-color="#3698a8"/><stop offset="50%" stop-color="#3693b0"/><stop offset="57.14%" stop-color="#378eb7"/><stop offset="64.29%" stop-color="#3889bf"/><stop offset="71.43%" stop-color="#3983c6"/><stop offset="78.57%" stop-color="#3b7dcd"/><stop offset="85.71%" stop-color="#3d77d4"/><stop offset="92.86%" stop-color="#3f70da"/><stop offset="100%" stop-color="#4169e1"/></linearGradient></defs><rect width="1440" height="600" fill="url(#bs-gradient)"/></svg>
dtcg
{
  "mediumseagreen-to-royalblue": {
    "$type": "gradient",
    "$value": [
      {
        "color": {
          "colorSpace": "srgb",
          "components": [
            0.235,
            0.702,
            0.443
          ],
          "hex": "#3cb371"
        },
        "position": 0
      },
      {
        "color": {
          "colorSpace": "srgb",
          "components": [
            0.255,
            0.412,
            0.882
          ],
          "hex": "#4169e1"
        },
        "position": 1
      }
    ],
    "$extensions": {
      "com.brandsweets": {
        "kind": "linear",
        "css": "linear-gradient(135deg in oklab, #3cb371 0%, #4169e1 100%)",
        "interpolation": "oklab",
        "angle": 135,
        "name": "mediumseagreen-to-royalblue",
        "contrast": {
          "white": {
            "ratio": 2.664,
            "at": 0.0087,
            "passesAA": false,
            "passesAALarge": false
          },
          "black": {
            "ratio": 4.333,
            "at": 1,
            "passesAA": false,
            "passesAALarge": true
          },
          "suggestedInk": "#000000"
        }
      }
    },
    "$description": "Medium Sea Green to Royal Blue, interpolated in oklab."
  }
}

More from Medium Sea Green

mcpConnect your agent to the gradient engine
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

make a medium sea green to royal blue hero gradient in oklch that passes AA for white text, with grain if it bands

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

Machine-readable: gradients.md