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
#21ba57
#21ba57
hex
#21ba57rgb
rgb(33, 186, 87)hsl
hsl(141, 70%, 43%)oklch
oklch(0.692 0.185 149.2)Closest name: Intoxicate (#11bb55)Relative luminance 0.3613
Colors that go with #21ba57
Charcoal, Royal Blue and Taupe 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 #21ba57: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Royal Blue #4169e1
shippedRoyal Blue is paired with #21ba57 in 5 real palettes, including Brilliant's brand system and Console Light, as the accent.
Taupe #483c32
shippedTaupe is paired with #21ba57 in 8 real palettes, including Obsidian's brand system and Chime's brand system, as the text colour against it.
Fuchsia #ff00ff
complementaryFuchsia sits directly opposite #21ba57 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 #21ba57: 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 #21ba57: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue #0000ff
shipped3 real palettes, including Spotify's brand system and Unity's brand system put Blue beside #21ba57, as the accent.
Cornflower Blue #6495ed
triadicshippedCornflower Blue completes a triad with #21ba57 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Real palettes that use #21ba57
Tints & shades
Harmonies
Contrast
| #21ba57 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 2.55:1 | fail | fail | fail | |
Aaon black | 8.23:1 | 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 #21ba57 as the background.
Brands using this color
Palettes built around it
mcpConnect your agent — build around #21ba57
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 #21ba57 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/21ba57-a2beaf-c459d4-1f2d2a-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