#21AE99
Closest named color: Greeny Blue (#42B395). oklch(67.6% 0.117 179.5), rgb(33, 174, 153).
Aa
Black text reads best on this color (7.57:1).
About this color
#21AE99 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 68%, its chroma 0.117 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.024 away. Black text reads best on it, at 7.57:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 7.57:1 |
| White text | 2.77:1 |
Values
| HEX | #21AE99 |
| RGB | rgb(33, 174, 153) |
| HSL | hsl(171, 68%, 41%) |
| OKLCH | oklch(67.6% 0.117 179.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #21AE99 | 2.77:1 | Fails | Lc -58.2 | Large or bold text, headings |
| Black text on #21AE99 | 7.57:1 | AAA | Lc 51.0 | Large or bold text, headings |
| #21AE99 text on white | 2.77:1 | Fails | Lc 53.0 | Large or bold text, headings |
| #21AE99 text on black | 7.57:1 | AAA | Lc -48.9 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#EFF8F5
oklch(97.2% 0.01 174.3)
-
Step 100
100
#DCEFEA
oklch(93.7% 0.021 178.3)
-
Step 200
200
#BDE2DA
oklch(88.4% 0.04 180.8)
-
Step 300
300
#8BD1C2
oklch(81% 0.074 179.4)
-
Step 400
400 (this color)
#21AE99
oklch(67.6% 0.117 179.5)
-
Step 500
500
#00A08B
oklch(63.2% 0.115 179)
-
Step 600
600
#008675
oklch(55.5% 0.101 179.7)
-
Step 700
700
#007162
oklch(49.1% 0.09 179.3)
-
Step 800
800
#005D50
oklch(42.8% 0.078 178.9)
-
Step 900
900
#004D43
oklch(37.7% 0.068 180.3)
-
Step 950
950
#002E27
oklch(27% 0.049 179.5)
#21AE99 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #A6A398 | 0.123 |
| Deuteranopia (no green cones) | #94969B | 0.117 |
| Tritanopia (no blue cones) | #00B1A8 | 0.021 |
| Achromatopsia (no color) | #9B9B9B | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21AE99
#21AE99
oklch(67.6% 0.117 179.5)
- #D17795
#D17795
oklch(67.6% 0.117 359.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #21AE99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.024
- Light Sea Green #20B2AA ΔE 0.025
- Topaz #13BBAF ΔE 0.042
- Persian Green #2A9D8F ΔE 0.048
- Bluey Green #2BB179 ΔE 0.049
- Dark Seafoam Green #3EAF76 ΔE 0.050
- Tea #65AB7C ΔE 0.052
- Jade #1FA774 ΔE 0.052
Use #21AE99 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.