#21B2E2
Closest named color: Turquoise Blue (#06B1C4). oklch(71.4% 0.132 227.1), rgb(33, 178, 226).
Aa
Black text reads best on this color (8.53:1).
About this color
#21B2E2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 71%, its chroma 0.132 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.046 away. Black text reads best on it, at 8.53:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.53:1 |
| White text | 2.46:1 |
Values
| HEX | #21B2E2 |
| RGB | rgb(33, 178, 226) |
| HSL | hsl(195, 77%, 51%) |
| OKLCH | oklch(71.4% 0.132 227.1) |
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 #21B2E2 | 2.46:1 | Fails | Lc -52.9 | Large or bold text, headings |
| Black text on #21B2E2 | 8.53:1 | AAA | Lc 56.1 | Large or bold text, headings |
| #21B2E2 text on white | 2.46:1 | Fails | Lc 47.9 | Large or bold text, headings |
| #21B2E2 text on black | 8.53:1 | AAA | Lc -54.1 | 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
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#DAEDF6
oklch(93.5% 0.024 227.7)
-
Step 200
200
#BBE0F1
oklch(88.6% 0.045 227.4)
-
Step 300
300
#86CCEA
oklch(81% 0.082 226.9)
-
Step 400
400 (this color)
#21B2E2
oklch(71.4% 0.132 227.1)
-
Step 500
500
#0097C2
oklch(63.1% 0.122 226.9)
-
Step 600
600
#007FA4
oklch(55.6% 0.108 227.1)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005772
oklch(42.6% 0.083 227.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#002B3A
oklch(27% 0.052 227.2)
#21B2E2 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) | #98AFE4 | 0.096 |
| Deuteranopia (no green cones) | #809EE1 | 0.082 |
| Tritanopia (no blue cones) | #00C0C2 | 0.071 |
| Achromatopsia (no color) | #A5A5A5 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B2E2
#21B2E2
oklch(71.4% 0.132 227.1)
- #E58756
#E58756
oklch(71.4% 0.132 47.3)
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 #21B2E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.046
- Deep Sky Blue #00BFFF ΔE 0.048
- Vivid Sky Blue #4CC9F0 ΔE 0.070
- Bright Sky Blue #02CCFE ΔE 0.074
- Greyblue #77A1B5 ΔE 0.082
- Light Sea Green #20B2AA ΔE 0.085
- Chefchaouen Blue #4895EF ΔE 0.086
- Topaz #13BBAF ΔE 0.088
Use #21B2E2 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.