#21F9F4
Closest named color: Bright Turquoise (#0FFEF9). oklch(88.9% 0.149 192.2), rgb(33, 249, 244).
Aa
Black text reads best on this color (15.92:1).
About this color
#21F9F4 is a light, vivid teal or cyan. In OKLCH its lightness is 89%, its chroma 0.149 and its hue 192°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Turquoise (#0FFEF9), ΔE 0.013 away. Black text reads best on it, at 15.92:1.
| Hue family | Teals and cyans |
| Lightness | light (89%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Bright Turquoise (#0FFEF9) |
| Black text | 15.92:1 |
| White text | 1.31:1 |
Values
| HEX | #21F9F4 |
| RGB | rgb(33, 249, 244) |
| HSL | hsl(179, 95%, 55%) |
| OKLCH | oklch(88.9% 0.149 192.2) |
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 #21F9F4 | 1.31:1 | Fails | Lc -17.4 | Dividers and decoration only |
| Black text on #21F9F4 | 15.92:1 | AAA | Lc 88.5 | Fine for body text |
| #21F9F4 text on white | 1.31:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #21F9F4 text on black | 15.92:1 | AAA | Lc -88.6 | 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
#E3FBFA
oklch(97% 0.025 193.7)
-
Step 100
100
#C0F6F3
oklch(93.5% 0.055 192)
-
Step 200
200 (this color)
#21F9F4
oklch(88.9% 0.149 192.2)
-
Step 300
300
#00DCD8
oklch(80.9% 0.139 192.4)
-
Step 400
400
#00B8B4
oklch(70.7% 0.121 192)
-
Step 500
500
#009E9A
oklch(63.2% 0.109 191.6)
-
Step 600
600
#008582
oklch(55.7% 0.096 192)
-
Step 700
700
#006F6D
oklch(49% 0.084 192.6)
-
Step 800
800
#005B59
oklch(42.6% 0.073 192.2)
-
Step 900
900
#004C4A
oklch(37.6% 0.065 191.7)
-
Step 950
950
#002D2C
oklch(26.9% 0.046 192.5)
#21F9F4 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) | #E9ECF4 | 0.157 |
| Deuteranopia (no green cones) | #CED8F5 | 0.147 |
| Tritanopia (no blue cones) | #00FFF7 | 0.015 |
| Achromatopsia (no color) | #E0E0E0 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21F9F4
#21F9F4
oklch(88.9% 0.149 192.2)
- #FFCBD0
#FFCBD0
oklch(88.9% 0.059 11.9)
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 #21F9F4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Turquoise #0FFEF9 ΔE 0.013
- Bright Aqua #0BF9EA ΔE 0.015
- Bright Light Blue #26F7FD ΔE 0.016
- Cyan #00FFFF ΔE 0.018
- Bright Cyan #41FDFE ΔE 0.020
- Robin's Egg #6DEDFD ΔE 0.048
- Robin Egg Blue #8AF1FE ΔE 0.060
- Light Turquoise #7EF4CC ΔE 0.060
Use #21F9F4 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.