Color
#21ab58
#21ab58rgb(33, 171, 88)hsl(144, 68%, 40%)oklch(0.652 0.165 151)Colors that go with #21ab58
Charcoal, Blue 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 text near-black for #21ab58: softer than #000 and cool enough to feel like part of the same palette.
Blue #0000ff
shipped5 real palettes, including Spotify's brand system and Unity's brand system put Blue beside #21ab58, as the accent.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21ab58 in 5 real palettes, including Console Light and Telehealth, as the lead colour.
Taupe #483c32
shippedTaupe is paired with #21ab58 in 9 real palettes, including Obsidian's brand system and Chime's brand system, as the text colour against it.
Fuchsia #ff00ff
complementaryFuchsia sits directly opposite #21ab58 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Medium Purple #9370db
split-complementshippedMedium Purple is a split-complement of #21ab58: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #21ab58 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Crimson #dc143c
shippedCrimson is paired with #21ab58 in 3 real palettes, including DuckDuckGo's brand system and Diner, as the supporting colour.
Real palettes that use #21ab58
Tints & shades
Harmonies
Contrast
| #21ab58 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.99:1 | fail | fail | fail | |
Aaon black | 7.03:1 | 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 #21ab58 as the background.
Brands using this color
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 #21ab58 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/21ab58-a2beb0-ca59d4-1f2d2b-eaf1e9?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