#21B2BB
Closest named color: Turquoise Blue (#06B1C4). oklch(69.7% 0.113 201.6), rgb(33, 178, 187).
Aa
Black text reads best on this color (8.15:1).
About this color
#21B2BB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.113 and its hue 202°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.015 away. Black text reads best on it, at 8.15:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.15:1 |
| White text | 2.57:1 |
Values
| HEX | #21B2BB |
| RGB | rgb(33, 178, 187) |
| HSL | hsl(184, 70%, 43%) |
| OKLCH | oklch(69.7% 0.113 201.6) |
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 #21B2BB | 2.57:1 | Fails | Lc -55.0 | Large or bold text, headings |
| Black text on #21B2BB | 8.15:1 | AAA | Lc 54.1 | Large or bold text, headings |
| #21B2BB text on white | 2.57:1 | Fails | Lc 49.9 | Large or bold text, headings |
| #21B2BB text on black | 8.15:1 | AAA | Lc -52.0 | 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
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DBEEF0
oklch(93.6% 0.02 204.4)
-
Step 200
200
#BCE1E4
oklch(88.4% 0.039 202.5)
-
Step 300
300
#89CFD4
oklch(81% 0.07 201.6)
-
Step 400
400 (this color)
#21B2BB
oklch(69.7% 0.113 201.6)
-
Step 500
500
#009CA5
oklch(63.1% 0.107 202)
-
Step 600
600
#00838B
oklch(55.5% 0.095 202.3)
-
Step 700
700
#006E75
oklch(49% 0.083 202.5)
-
Step 800
800
#005A60
oklch(42.6% 0.073 202.7)
-
Step 900
900
#004B50
oklch(37.6% 0.064 202.5)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#21B2BB 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) | #A4AABC | 0.114 |
| Deuteranopia (no green cones) | #8F9BBC | 0.105 |
| Tritanopia (no blue cones) | #00B9B4 | 0.026 |
| Achromatopsia (no color) | #A1A1A1 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B2BB
#21B2BB
oklch(69.7% 0.113 201.6)
- #DB807E
#DB807E
oklch(69.7% 0.113 21.7)
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 #21B2BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.015
- Light Sea Green #20B2AA ΔE 0.026
- Topaz #13BBAF ΔE 0.036
- Greeny Blue #42B395 ΔE 0.057
- Cadet Blue #5F9EA0 ΔE 0.062
- Greyblue #77A1B5 ΔE 0.070
- Dull Teal #5F9E8F ΔE 0.073
- Persian Green #2A9D8F ΔE 0.076
Use #21B2BB 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.