#3FD4B2
Closest named color: Medium Aquamarine (#66CDAA). oklch(78.4% 0.133 173.9), rgb(63, 212, 178).
Aa
Black text reads best on this color (11.27:1).
About this color
#3FD4B2 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.133 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.027 away. Black text reads best on it, at 11.27:1.
| Hue family | Teals and cyans |
| Lightness | light (78%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 11.27:1 |
| White text | 1.86:1 |
Values
| HEX | #3FD4B2 |
| RGB | rgb(63, 212, 178) |
| HSL | hsl(166, 63%, 54%) |
| OKLCH | oklch(78.4% 0.133 173.9) |
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 #3FD4B2 | 1.86:1 | Fails | Lc -38.9 | Non-text elements, placeholder text |
| Black text on #3FD4B2 | 11.27:1 | AAA | Lc 69.1 | Content text, not long reading |
| #3FD4B2 text on white | 1.86:1 | Fails | Lc 34.8 | Non-text elements, placeholder text |
| #3FD4B2 text on black | 11.27:1 | AAA | Lc -67.8 | Content text, not long reading |
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
#EAFAF4
oklch(97.2% 0.019 171.5)
-
Step 100
100
#D1F3E8
oklch(93.7% 0.038 173.9)
-
Step 200
200
#A6EAD5
oklch(88.6% 0.074 173.4)
-
Step 300
300 (this color)
#3FD4B2
oklch(78.4% 0.133 173.9)
-
Step 400
400
#00BB9A
oklch(70.7% 0.134 174)
-
Step 500
500
#00A084
oklch(63% 0.119 174.3)
-
Step 600
600
#00876E
oklch(55.6% 0.106 173.6)
-
Step 700
700
#00725C
oklch(49.2% 0.094 173.1)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3F
oklch(37.8% 0.072 174.1)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#3FD4B2 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) | #CDC6B0 | 0.139 |
| Deuteranopia (no green cones) | #B9B8B4 | 0.132 |
| Tritanopia (no blue cones) | #00D6CA | 0.033 |
| Achromatopsia (no color) | #BEBEBE | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3FD4B2
#3FD4B2
oklch(78.4% 0.133 173.9)
- #FA93BF
#FA93BF
oklch(78.3% 0.133 353.5)
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 #3FD4B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.027
- Emerald #06D6A0 ΔE 0.033
- Seafoam Blue #78D1B6 ΔE 0.040
- Medium Turquoise #48D1CC ΔE 0.042
- Turquoise #40E0D0 ΔE 0.046
- Pale Teal #82CBB2 ΔE 0.052
- Dark Turquoise #00CED1 ΔE 0.054
- Aqua Marine #2EE8BB ΔE 0.054
Use #3FD4B2 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.