Color
#51981b
#51981brgb(81, 152, 27)hsl(94, 70%, 35%)oklch(0.61 0.168 135.5)Colors that go with #51981b
Charcoal, Crimson and Denim lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #51981b: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Crimson #dc143c
triadicshippedCrimson completes a triad with #51981b — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Denim #1560bd
shippedDesigners have shipped Denim with #51981b: 5 real palettes, including Intel's brand system and Jack Daniel's's brand system, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #51981b in 4 real palettes, including Console Light and Telehealth, as the lead colour.
Taupe #483c32
shippedTaupe is paired with #51981b in 5 real palettes, including Instacart's brand system and Wellness, as the lead colour.
Medium Orchid #ba55d3
complementaryMedium Orchid sits directly opposite #51981b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Medium Violet Red #c71585
split-complementshippedMedium Violet Red is a split-complement of #51981b: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shipped3 real palettes, including Instacart's brand system and Kia's brand system put Blue beside #51981b, as the accent.
Real palettes that use #51981b
Tints & shades
Harmonies
Contrast
| #51981b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.59:1 | fail | pass | fail | |
Aaon black | 5.86:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #51981b as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #51981b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51981b-abbea2-5a4edf-1f2d1f-f0f1e9?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md