#21BDDB
Closest named color: Turquoise Blue (#06B1C4). oklch(73.7% 0.125 215.3), rgb(33, 189, 219).
Aa
Black text reads best on this color (9.36:1).
About this color
#21BDDB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.125 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.044 away. Black text reads best on it, at 9.36:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 9.36:1 |
| White text | 2.24:1 |
Values
| HEX | #21BDDB |
| RGB | rgb(33, 189, 219) |
| HSL | hsl(190, 74%, 49%) |
| OKLCH | oklch(73.7% 0.125 215.3) |
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 #21BDDB | 2.24:1 | Fails | Lc -48.4 | Large or bold text, headings |
| Black text on #21BDDB | 9.36:1 | AAA | Lc 60.3 | Content text, not long reading |
| #21BDDB text on white | 2.24:1 | Fails | Lc 43.7 | Non-text elements, placeholder text |
| #21BDDB text on black | 9.36:1 | AAA | Lc -58.5 | 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
#EEF7FA
oklch(97% 0.01 219.6)
-
Step 100
100
#DAEEF3
oklch(93.6% 0.022 214.4)
-
Step 200
200
#BAE1EB
oklch(88.5% 0.043 215)
-
Step 300
300
#84CEE0
oklch(80.9% 0.078 214.9)
-
Step 400
400 (this color)
#21BDDB
oklch(73.7% 0.125 215.3)
-
Step 500
500
#009AB4
oklch(63.2% 0.112 215.3)
-
Step 600
600
#008197
oklch(55.5% 0.098 215.2)
-
Step 700
700
#006D80
oklch(49.2% 0.087 215.3)
-
Step 800
800
#005969
oklch(42.7% 0.076 215.4)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#21BDDB 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) | #A8B7DD | 0.110 |
| Deuteranopia (no green cones) | #91A6DB | 0.099 |
| Tritanopia (no blue cones) | #00C8C6 | 0.051 |
| Achromatopsia (no color) | #ADADAD | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BDDB
#21BDDB
oklch(73.7% 0.125 215.3)
- #ED8C73
#ED8C73
oklch(73.7% 0.124 35.3)
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 #21BDDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.044
- Vivid Sky Blue #4CC9F0 ΔE 0.048
- Deep Sky Blue #00BFFF ΔE 0.052
- Dark Turquoise #00CED1 ΔE 0.055
- Bright Sky Blue #02CCFE ΔE 0.057
- Topaz #13BBAF ΔE 0.065
- Medium Turquoise #48D1CC ΔE 0.071
- Light Sea Green #20B2AA ΔE 0.072
Use #21BDDB 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.