#21AF91
Closest named color: Greeny Blue (#42B395). oklch(67.6% 0.122 173.8), rgb(33, 175, 145).
Aa
Black text reads best on this color (7.60:1).
About this color
#21AF91 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 68%, its chroma 0.122 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.022 away. Black text reads best on it, at 7.60:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 7.60:1 |
| White text | 2.76:1 |
Values
| HEX | #21AF91 |
| RGB | rgb(33, 175, 145) |
| HSL | hsl(167, 68%, 41%) |
| OKLCH | oklch(67.6% 0.122 173.8) |
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 #21AF91 | 2.76:1 | Fails | Lc -58.1 | Large or bold text, headings |
| Black text on #21AF91 | 7.60:1 | AAA | Lc 51.2 | Large or bold text, headings |
| #21AF91 text on white | 2.76:1 | Fails | Lc 52.8 | Large or bold text, headings |
| #21AF91 text on black | 7.60:1 | AAA | Lc -49.0 | 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
#DCEFE9
oklch(93.6% 0.022 175)
-
Step 200
200
#BDE3D7
oklch(88.5% 0.043 174.2)
-
Step 300
300
#8BD1BD
oklch(80.8% 0.076 174.4)
-
Step 400
400 (this color)
#21AF91
oklch(67.6% 0.122 173.8)
-
Step 500
500
#00A184
oklch(63.2% 0.121 173.8)
-
Step 600
600
#00876E
oklch(55.6% 0.106 173.6)
-
Step 700
700
#00725C
oklch(49.2% 0.094 173.1)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3E
oklch(37.8% 0.073 172.9)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#21AF91 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) | #A9A390 | 0.127 |
| Deuteranopia (no green cones) | #979693 | 0.122 |
| Tritanopia (no blue cones) | #00B1A6 | 0.029 |
| Achromatopsia (no color) | #9C9C9C | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21AF91
#21AF91
oklch(67.6% 0.122 173.8)
- #D1769C
#D1769C
oklch(67.7% 0.122 354.4)
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 #21AF91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.022
- Light Sea Green #20B2AA ΔE 0.036
- Bluey Green #2BB179 ΔE 0.036
- Dark Seafoam Green #3EAF76 ΔE 0.038
- Jade #1FA774 ΔE 0.042
- Dark Seafoam #1FB57A ΔE 0.042
- Tea #65AB7C ΔE 0.045
- Green Teal #0CB577 ΔE 0.046
Use #21AF91 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.