#21E1B5
Closest named color: Aqua Marine (#2EE8BB). oklch(81.2% 0.154 171.4), rgb(33, 225, 181).
Aa
Black text reads best on this color (12.50:1).
About this color
#21E1B5 is a light, vivid teal or cyan. In OKLCH its lightness is 81%, its chroma 0.154 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.020 away. Black text reads best on it, at 12.50:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 12.50:1 |
| White text | 1.67:1 |
Values
| HEX | #21E1B5 |
| RGB | rgb(33, 225, 181) |
| HSL | hsl(166, 76%, 51%) |
| OKLCH | oklch(81.2% 0.154 171.4) |
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 #21E1B5 | 1.67:1 | Fails | Lc -32.8 | Non-text elements, placeholder text |
| Black text on #21E1B5 | 12.50:1 | AAA | Lc 74.7 | Content text, not long reading |
| #21E1B5 text on white | 1.67:1 | Fails | Lc 29.1 | Dividers and decoration only |
| #21E1B5 text on black | 12.50:1 | AAA | Lc -73.7 | Content text, not long reading |
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 300.
-
Step 50
50
#E9FAF4
oklch(97.1% 0.02 172.8)
-
Step 100
100
#CDF4E6
oklch(93.6% 0.045 171.6)
-
Step 200
200
#9EECD2
oklch(88.5% 0.085 171.3)
-
Step 300
300 (this color)
#21E1B5
oklch(81.2% 0.154 171.4)
-
Step 400
400
#00BC96
oklch(70.8% 0.138 171.4)
-
Step 500
500
#00A180
oklch(63.1% 0.123 171.4)
-
Step 600
600
#00876B
oklch(55.5% 0.108 171.4)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D49
oklch(42.6% 0.083 171.6)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002F23
oklch(27.2% 0.053 170.5)
#21E1B5 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) | #DAD1B3 | 0.158 |
| Deuteranopia (no green cones) | #C3C1B8 | 0.151 |
| Tritanopia (no blue cones) | #00E3D4 | 0.042 |
| Achromatopsia (no color) | #C8C8C8 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21E1B5
#21E1B5
oklch(81.2% 0.154 171.4)
- #FF9FCB
#FF9FCB
oklch(81.2% 0.125 351.3)
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 #21E1B5, closest first.
No curated palette has a color within ΔE 0.04 of #21E1B5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.020
- Emerald #06D6A0 ΔE 0.038
- Turquoise #40E0D0 ΔE 0.042
- Aqua Green #12E193 ΔE 0.046
- Medium Aquamarine #66CDAA ΔE 0.057
- Seafoam Blue #78D1B6 ΔE 0.061
- Bright Teal #01F9C6 ΔE 0.064
- Medium Turquoise #48D1CC ΔE 0.065
Use #21E1B5 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.