Color
#51bd69
#51bd69rgb(81, 189, 105)hsl(133, 45%, 53%)oklch(0.715 0.156 148.4)Colors that go with #51bd69
Charcoal, Dark Olive Green and Royal Blue 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 #51bd69: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #51bd69 in 4 real palettes, including Undergrowth and Forest Floor, as the supporting colour.
Royal Blue #4169e1
shippedRoyal Blue is paired with #51bd69 in 5 real palettes, including Brilliant's brand system and Khan Academy's brand system, as the accent.
Taupe #483c32
shippedTaupe is paired with #51bd69 in 14 real palettes, including Chime's brand system and Meadow, as the lead colour.
Orchid #da70d6
complementaryOrchid sits directly opposite #51bd69 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Blue #0000ff
shipped3 real palettes, including Unity's brand system and Spotify's brand system put Blue beside #51bd69, as the supporting colour.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #51bd69 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Orange #ff8c00
shippedDark Orange shows up next to #51bd69 in 3 real palettes, including Playground and Citrus Grove, as the lead colour.
Real palettes that use #51bd69
Tints & shades
Harmonies
Contrast
| #51bd69 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.38:1 | fail | fail | fail | |
Aaon black | 8.83:1 | pass | pass | pass | Passes AAA — no fix needed. |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #51bd69 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 #51bd69 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/51bd69-a2beab-b84edf-1f2d28-ebf1e9?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