#21E1FB
Closest named color: Aqua Blue (#02D8E9). oklch(83.5% 0.14 209.9), rgb(33, 225, 251).
Aa
Black text reads best on this color (13.22:1).
About this color
#21E1FB is a light, vivid teal or cyan. In OKLCH its lightness is 84%, its chroma 0.140 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.033 away. Black text reads best on it, at 13.22:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 13.22:1 |
| White text | 1.58:1 |
Values
| HEX | #21E1FB |
| RGB | rgb(33, 225, 251) |
| HSL | hsl(187, 96%, 56%) |
| OKLCH | oklch(83.5% 0.14 209.9) |
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 #21E1FB | 1.58:1 | Fails | Lc -29.5 | Dividers and decoration only |
| Black text on #21E1FB | 13.22:1 | AAA | Lc 77.7 | Fine for body text |
| #21E1FB text on white | 1.58:1 | Fails | Lc 26.0 | Dividers and decoration only |
| #21E1FB text on black | 13.22:1 | AAA | Lc -77.0 | Fine for body text |
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 300.
-
Step 50
50
#E8F9FC
oklch(97% 0.018 209.4)
-
Step 100
100
#CCF2F9
oklch(93.6% 0.04 210)
-
Step 200
200
#9BE8F6
oklch(88.6% 0.078 210.2)
-
Step 300
300 (this color)
#21E1FB
oklch(83.5% 0.14 209.9)
-
Step 400
400
#00B5CA
oklch(70.8% 0.122 209.4)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#21E1FB 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) | #CBD8FD | 0.132 |
| Deuteranopia (no green cones) | #B0C5FB | 0.120 |
| Tritanopia (no blue cones) | #00ECE9 | 0.046 |
| Achromatopsia (no color) | #CDCDCD | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21E1FB
#21E1FB
oklch(83.5% 0.14 209.9)
- #FFB3A6
#FFB3A6
oklch(83.5% 0.091 29.9)
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 #21E1FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.033
- Robin's Egg #6DEDFD ΔE 0.052
- Turquoise #40E0D0 ΔE 0.060
- Bright Light Blue #26F7FD ΔE 0.061
- Bright Sky Blue #02CCFE ΔE 0.061
- Vivid Sky Blue #4CC9F0 ΔE 0.063
- Medium Turquoise #48D1CC ΔE 0.068
- Sky Blue #87CEEB ΔE 0.068
Use #21E1FB 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.