Terminal
Open in tool →Green for success, blue for links, pink for emphasis — the dark-mode developer family, tuned to sit on near-black without glare.
Color
#21b552
#21b552
hex
#21b552rgb
rgb(33, 181, 82)hsl
hsl(140, 69%, 42%)oklch
oklch(0.678 0.183 148.7)Closest name: Intoxicate (#11bb55)Relative luminance 0.3398
Colors that go with #21b552
Charcoal, Taupe and Fuchsia 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 #21b552: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Taupe #483c32
shippedTaupe is paired with #21b552 in 5 real palettes, including Obsidian's brand system and Meadow, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Fuchsia #ff00ff
complementaryFuchsia sits directly opposite #21b552 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Hot Pink #ff69b4
split-complementshippedHot Pink is a split-complement of #21b552: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Medium Purple #9370db
split-complementshippedMedium Purple is a split-complement of #21b552: 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 #21b552 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Dark Orange #ff8c00
shippedDark Orange is paired with #21b552 in 3 real palettes, including Playground and Learning App, as the lead colour — a combination designers have actually shipped, not a computed rotation.
Dodger Blue #1e90ff
shippedDodger Blue is paired with #21b552 in 3 real palettes, including Playground and Unity's brand system, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Real palettes that use #21b552
Tints & shades
Harmonies
Contrast
| #21b552 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.69:1 | fail | fail | fail | |
Aaon black | 7.8:1 | 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 #21b552 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #21b552
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #21b552 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21b552-a2beaf-c259d4-1f2d2a-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