#21B0BB
Closest named color: Turquoise Blue (#06B1C4). oklch(69.2% 0.112 203.2), rgb(33, 176, 187).
Aa
Black text reads best on this color (7.99:1).
About this color
#21B0BB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 69%, its chroma 0.112 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.013 away. Black text reads best on it, at 7.99:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.99:1 |
| White text | 2.62:1 |
Values
| HEX | #21B0BB |
| RGB | rgb(33, 176, 187) |
| HSL | hsl(184, 70%, 43%) |
| OKLCH | oklch(69.2% 0.112 203.2) |
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 #21B0BB | 2.62:1 | Fails | Lc -55.9 | Large or bold text, headings |
| Black text on #21B0BB | 7.99:1 | AAA | Lc 53.3 | Large or bold text, headings |
| #21B0BB text on white | 2.62:1 | Fails | Lc 50.7 | Large or bold text, headings |
| #21B0BB text on black | 7.99:1 | AAA | Lc -51.2 | 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
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DBEEF0
oklch(93.6% 0.02 204.4)
-
Step 200
200
#BCE1E5
oklch(88.4% 0.039 204.5)
-
Step 300
300
#89CED5
oklch(80.8% 0.07 204)
-
Step 400
400 (this color)
#21B0BB
oklch(69.2% 0.112 203.2)
-
Step 500
500
#009CA6
oklch(63.1% 0.107 202.8)
-
Step 600
600
#00838C
oklch(55.6% 0.095 203.3)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800
#005A61
oklch(42.6% 0.073 204)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#21B0BB 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) | #A1A8BC | 0.112 |
| Deuteranopia (no green cones) | #8D99BC | 0.104 |
| Tritanopia (no blue cones) | #00B7B3 | 0.027 |
| Achromatopsia (no color) | #A0A0A0 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B0BB
#21B0BB
oklch(69.2% 0.112 203.2)
- #D97F7B
#D97F7B
oklch(69.3% 0.112 23.1)
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 #21B0BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.013
- Light Sea Green #20B2AA ΔE 0.028
- Topaz #13BBAF ΔE 0.041
- Cadet Blue #5F9EA0 ΔE 0.059
- Greeny Blue #42B395 ΔE 0.060
- Greyblue #77A1B5 ΔE 0.068
- Dull Teal #5F9E8F ΔE 0.071
- Persian Green #2A9D8F ΔE 0.073
Use #21B0BB 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.