#21BCB4
Closest named color: Topaz (#13BBAF). oklch(72% 0.119 189.3), rgb(33, 188, 180).
Aa
Black text reads best on this color (8.91:1).
About this color
#21BCB4 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.119 and its hue 189°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.009 away. Black text reads best on it, at 8.91:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.91:1 |
| White text | 2.35:1 |
Values
| HEX | #21BCB4 |
| RGB | rgb(33, 188, 180) |
| HSL | hsl(177, 70%, 43%) |
| OKLCH | oklch(72% 0.119 189.3) |
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 #21BCB4 | 2.35:1 | Fails | Lc -50.8 | Large or bold text, headings |
| Black text on #21BCB4 | 8.91:1 | AAA | Lc 58.1 | Large or bold text, headings |
| #21BCB4 text on white | 2.35:1 | Fails | Lc 45.9 | Large or bold text, headings |
| #21BCB4 text on black | 8.91:1 | AAA | Lc -56.1 | 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
#EEF8F7
oklch(97.1% 0.011 189.8)
-
Step 100
100
#DBEFED
oklch(93.7% 0.021 189.6)
-
Step 200
200
#BBE2DF
oklch(88.4% 0.041 190.7)
-
Step 300
300
#86D1CA
oklch(81% 0.075 188.3)
-
Step 400
400 (this color)
#21BCB4
oklch(72% 0.119 189.3)
-
Step 500
500
#009E97
oklch(63.1% 0.109 189.2)
-
Step 600
600
#00857F
oklch(55.6% 0.096 189.2)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C57
oklch(42.8% 0.074 188.4)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#21BCB4 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) | #B1B2B4 | 0.126 |
| Deuteranopia (no green cones) | #9CA3B5 | 0.117 |
| Tritanopia (no blue cones) | #00C1B9 | 0.014 |
| Achromatopsia (no color) | #A9A9A9 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BCB4
#21BCB4
oklch(72% 0.119 189.3)
- #E48494
#E48494
oklch(72.1% 0.119 9.8)
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 #21BCB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.009
- Light Sea Green #20B2AA ΔE 0.029
- Greeny Blue #42B395 ΔE 0.043
- Turquoise Blue #06B1C4 ΔE 0.046
- Dark Turquoise #00CED1 ΔE 0.056
- Green Blue #01C08D ΔE 0.062
- Medium Turquoise #48D1CC ΔE 0.067
- Greenblue #23C48B ΔE 0.070
Use #21BCB4 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.