#63CB91
Closest named color: Medium Aquamarine (#66CDAA). oklch(76.5% 0.129 157), rgb(99, 203, 145).
Aa
Black text reads best on this color (10.48:1).
About this color
#63CB91 is a medium-light, moderately saturated green. In OKLCH its lightness is 76%, its chroma 0.129 and its hue 157°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.034 away. Black text reads best on it, at 10.48:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.48:1 |
| White text | 2.00:1 |
Values
| HEX | #63CB91 |
| RGB | rgb(99, 203, 145) |
| HSL | hsl(147, 50%, 59%) |
| OKLCH | oklch(76.5% 0.129 157) |
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 #63CB91 | 2.00:1 | Fails | Lc -43.0 | Non-text elements, placeholder text |
| Black text on #63CB91 | 10.48:1 | AAA | Lc 65.3 | Content text, not long reading |
| #63CB91 text on white | 2.00:1 | Fails | Lc 38.6 | Non-text elements, placeholder text |
| #63CB91 text on black | 10.48:1 | AAA | Lc -63.8 | 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
#EDF9F1
oklch(97.1% 0.016 156.9)
-
Step 100
100
#D7F2E0
oklch(93.7% 0.037 156.4)
-
Step 200
200
#B3E8C6
oklch(88.5% 0.072 156.5)
-
Step 300
300 (this color)
#63CB91
oklch(76.5% 0.129 157)
-
Step 400
400
#00BF74
oklch(70.8% 0.169 156.8)
-
Step 500
500
#00A363
oklch(63% 0.15 157)
-
Step 600
600
#008A53
oklch(55.7% 0.133 157)
-
Step 700
700
#007445
oklch(49.2% 0.117 157)
-
Step 800
800
#005F37
oklch(42.7% 0.102 156.7)
-
Step 900
900
#004F2D
oklch(37.6% 0.09 156.8)
-
Step 950
950
#002F19
oklch(26.9% 0.064 157.1)
#63CB91 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) | #CABE8E | 0.119 |
| Deuteranopia (no green cones) | #BBB395 | 0.116 |
| Tritanopia (no blue cones) | #45CABB | 0.060 |
| Achromatopsia (no color) | #B7B7B7 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63CB91
#63CB91
oklch(76.5% 0.129 157)
- #E791D0
#E791D0
oklch(76.4% 0.13 337.3)
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 #63CB91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.034
- Soft Green #6FC276 ΔE 0.034
- Emerald #06D6A0 ΔE 0.041
- Greenblue #23C48B ΔE 0.044
- Dark Mint #48C072 ΔE 0.052
- Seaweed #18D17B ΔE 0.054
- Seafoam Blue #78D1B6 ΔE 0.056
- Dark Sea Green #8FBC8F ΔE 0.056
Use #63CB91 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.