#21FBF1
Closest named color: Bright Aqua (#0BF9EA). oklch(89.3% 0.151 189.6), rgb(33, 251, 241).
Aa
Black text reads best on this color (16.13:1).
About this color
#21FBF1 is a light, vivid teal or cyan. In OKLCH its lightness is 89%, its chroma 0.151 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Aqua (#0BF9EA), ΔE 0.011 away. Black text reads best on it, at 16.13:1.
| Hue family | Teals and cyans |
| Lightness | light (89%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Bright Aqua (#0BF9EA) |
| Black text | 16.13:1 |
| White text | 1.30:1 |
Values
| HEX | #21FBF1 |
| RGB | rgb(33, 251, 241) |
| HSL | hsl(177, 96%, 56%) |
| OKLCH | oklch(89.3% 0.151 189.6) |
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 #21FBF1 | 1.30:1 | Fails | Lc -16.5 | Dividers and decoration only |
| Black text on #21FBF1 | 16.13:1 | AAA | Lc 89.3 | Fine for body text |
| #21FBF1 text on white | 1.30:1 | Fails | Lc 14.3 | Not readable |
| #21FBF1 text on black | 16.13:1 | AAA | Lc -89.5 | 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 200.
-
Step 50
50
#E3FBF9
oklch(97% 0.025 190.7)
-
Step 100
100
#C0F7F2
oklch(93.7% 0.056 189.3)
-
Step 200
200 (this color)
#21FBF1
oklch(89.3% 0.151 189.6)
-
Step 300
300
#00DDD4
oklch(81% 0.14 189.6)
-
Step 400
400
#00B8B1
oklch(70.6% 0.122 190)
-
Step 500
500
#009E98
oklch(63.1% 0.109 190)
-
Step 600
600
#00857F
oklch(55.6% 0.096 189.2)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#21FBF1 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) | #ECEDF1 | 0.160 |
| Deuteranopia (no green cones) | #D1D9F3 | 0.151 |
| Tritanopia (no blue cones) | #00FFF7 | 0.011 |
| Achromatopsia (no color) | #E1E1E1 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21FBF1
#21FBF1
oklch(89.3% 0.151 189.6)
- #FFCDD3
#FFCDD3
oklch(89.3% 0.057 10.2)
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 #21FBF1, closest first.
No curated palette has a color within ΔE 0.04 of #21FBF1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Aqua #0BF9EA ΔE 0.011
- Bright Turquoise #0FFEF9 ΔE 0.011
- Cyan #00FFFF ΔE 0.019
- Bright Cyan #41FDFE ΔE 0.022
- Bright Light Blue #26F7FD ΔE 0.023
- Robin's Egg #6DEDFD ΔE 0.054
- Light Turquoise #7EF4CC ΔE 0.056
- Aquamarine #7FFFD4 ΔE 0.058
Use #21FBF1 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.