#21BC9E
Closest named color: Greeny Blue (#42B395). oklch(71.3% 0.128 175.1), rgb(33, 188, 158).
Aa
Black text reads best on this color (8.75:1).
About this color
#21BC9E is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.128 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.026 away. Black text reads best on it, at 8.75:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 8.75:1 |
| White text | 2.39:1 |
Values
| HEX | #21BC9E |
| RGB | rgb(33, 188, 158) |
| HSL | hsl(168, 70%, 43%) |
| OKLCH | oklch(71.3% 0.128 175.1) |
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 #21BC9E | 2.39:1 | Fails | Lc -51.7 | Large or bold text, headings |
| Black text on #21BC9E | 8.75:1 | AAA | Lc 57.2 | Large or bold text, headings |
| #21BC9E text on white | 2.39:1 | Fails | Lc 46.8 | Large or bold text, headings |
| #21BC9E text on black | 8.75:1 | AAA | Lc -55.3 | 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
#DBEFE9
oklch(93.6% 0.023 175.9)
-
Step 200
200
#BCE3D7
oklch(88.5% 0.044 174.6)
-
Step 300
300
#87D2BE
oklch(80.9% 0.08 175.5)
-
Step 400
400 (this color)
#21BC9E
oklch(71.3% 0.128 175.1)
-
Step 500
500
#00A085
oklch(63% 0.119 175)
-
Step 600
600
#008770
oklch(55.7% 0.105 175.1)
-
Step 700
700
#00715E
oklch(49% 0.092 175.6)
-
Step 800
800
#005D4D
oklch(42.7% 0.08 175.6)
-
Step 900
900
#004E3F
oklch(37.8% 0.072 174.1)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#21BC9E 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) | #B5AF9D | 0.134 |
| Deuteranopia (no green cones) | #A2A1A0 | 0.129 |
| Tritanopia (no blue cones) | #00BEB3 | 0.029 |
| Achromatopsia (no color) | #A7A7A7 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BC9E
#21BC9E
oklch(71.3% 0.128 175.1)
- #E07FA6
#E07FA6
oklch(71.3% 0.127 355.3)
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 #21BC9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.026
- Topaz #13BBAF ΔE 0.026
- Green Blue #01C08D ΔE 0.031
- Light Sea Green #20B2AA ΔE 0.039
- Greenblue #23C48B ΔE 0.041
- Dark Seafoam #1FB57A ΔE 0.049
- Bluey Green #2BB179 ΔE 0.052
- Green Teal #0CB577 ΔE 0.054
Use #21BC9E 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.