#21BBBA
Closest named color: Topaz (#13BBAF). oklch(71.9% 0.118 194.1), rgb(33, 187, 186).
Aa
Black text reads best on this color (8.88:1).
About this color
#21BBBA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.118 and its hue 194°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.017 away. Black text reads best on it, at 8.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.88:1 |
| White text | 2.36:1 |
Values
| HEX | #21BBBA |
| RGB | rgb(33, 187, 186) |
| HSL | hsl(180, 70%, 43%) |
| OKLCH | oklch(71.9% 0.118 194.1) |
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 #21BBBA | 2.36:1 | Fails | Lc -51.0 | Large or bold text, headings |
| Black text on #21BBBA | 8.88:1 | AAA | Lc 57.9 | Large or bold text, headings |
| #21BBBA text on white | 2.36:1 | Fails | Lc 46.1 | Large or bold text, headings |
| #21BBBA text on black | 8.88:1 | AAA | Lc -56.0 | 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
#EEF8F7
oklch(97.1% 0.011 189.8)
-
Step 100
100
#DBEFEE
oklch(93.7% 0.021 193.2)
-
Step 200
200
#BBE2E1
oklch(88.5% 0.041 194.5)
-
Step 300
300
#86D0CE
oklch(80.9% 0.074 193.6)
-
Step 400
400 (this color)
#21BBBA
oklch(71.9% 0.118 194.1)
-
Step 500
500
#009D9D
oklch(63% 0.108 194.8)
-
Step 600
600
#008484
oklch(55.5% 0.095 194.8)
-
Step 700
700
#006F6F
oklch(49% 0.084 194.8)
-
Step 800
800
#005B5B
oklch(42.7% 0.073 194.8)
-
Step 900
900
#004C4C
oklch(37.7% 0.064 194.8)
-
Step 950
950
#002D2D
oklch(26.9% 0.046 194.8)
#21BBBA 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) | #AEB1BA | 0.123 |
| Deuteranopia (no green cones) | #9AA2BB | 0.115 |
| Tritanopia (no blue cones) | #00C1BA | 0.017 |
| Achromatopsia (no color) | #A8A8A8 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BBBA
#21BBBA
oklch(71.9% 0.118 194.1)
- #E4848E
#E4848E
oklch(71.9% 0.118 13.8)
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 #21BBBA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.017
- Light Sea Green #20B2AA ΔE 0.030
- Turquoise Blue #06B1C4 ΔE 0.038
- Greeny Blue #42B395 ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.055
- Medium Turquoise #48D1CC ΔE 0.068
- Green Blue #01C08D ΔE 0.072
- Medium Aquamarine #66CDAA ΔE 0.076
Use #21BBBA 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.