#21BBB6
Closest named color: Topaz (#13BBAF). oklch(71.8% 0.118 191.3), rgb(33, 187, 182).
Aa
Black text reads best on this color (8.84:1).
About this color
#21BBB6 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.118 and its hue 191°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.011 away. Black text reads best on it, at 8.84:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.84:1 |
| White text | 2.37:1 |
Values
| HEX | #21BBB6 |
| RGB | rgb(33, 187, 182) |
| HSL | hsl(178, 70%, 43%) |
| OKLCH | oklch(71.8% 0.118 191.3) |
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 #21BBB6 | 2.37:1 | Fails | Lc -51.2 | Large or bold text, headings |
| Black text on #21BBB6 | 8.84:1 | AAA | Lc 57.7 | Large or bold text, headings |
| #21BBB6 text on white | 2.37:1 | Fails | Lc 46.3 | Large or bold text, headings |
| #21BBB6 text on black | 8.84:1 | AAA | Lc -55.8 | 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
#BBE2E0
oklch(88.4% 0.041 192.6)
-
Step 300
300
#86D0CC
oklch(80.8% 0.074 191.4)
-
Step 400
400 (this color)
#21BBB6
oklch(71.8% 0.118 191.3)
-
Step 500
500
#009E99
oklch(63.1% 0.109 190.8)
-
Step 600
600
#008581
oklch(55.7% 0.096 191.1)
-
Step 700
700
#00706C
oklch(49.2% 0.085 190.4)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#21BBB6 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) | #AFB1B6 | 0.124 |
| Deuteranopia (no green cones) | #9BA2B7 | 0.117 |
| Tritanopia (no blue cones) | #00C1B9 | 0.016 |
| Achromatopsia (no color) | #A8A8A8 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BBB6
#21BBB6
oklch(71.8% 0.118 191.3)
- #E38491
#E38491
oklch(71.9% 0.117 11.7)
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 #21BBB6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.011
- Light Sea Green #20B2AA ΔE 0.027
- Turquoise Blue #06B1C4 ΔE 0.041
- Greeny Blue #42B395 ΔE 0.045
- Dark Turquoise #00CED1 ΔE 0.057
- Green Blue #01C08D ΔE 0.067
- Medium Turquoise #48D1CC ΔE 0.069
- Medium Aquamarine #66CDAA ΔE 0.074
Use #21BBB6 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.