#63CA99
Closest named color: Medium Aquamarine (#66CDAA). oklch(76.4% 0.121 160.9), rgb(99, 202, 153).
Aa
Black text reads best on this color (10.43:1).
About this color
#63CA99 is a medium-light, moderately saturated green. In OKLCH its lightness is 76%, its chroma 0.121 and its hue 161°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.023 away. Black text reads best on it, at 10.43:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.121) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.43:1 |
| White text | 2.01:1 |
Values
| HEX | #63CA99 |
| RGB | rgb(99, 202, 153) |
| HSL | hsl(151, 49%, 59%) |
| OKLCH | oklch(76.4% 0.121 160.9) |
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 #63CA99 | 2.01:1 | Fails | Lc -43.3 | Non-text elements, placeholder text |
| Black text on #63CA99 | 10.43:1 | AAA | Lc 65.1 | Content text, not long reading |
| #63CA99 text on white | 2.01:1 | Fails | Lc 38.8 | Non-text elements, placeholder text |
| #63CA99 text on black | 10.43:1 | AAA | Lc -63.6 | 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
#EDF9F2
oklch(97.1% 0.016 160.6)
-
Step 100
100
#D7F2E2
oklch(93.7% 0.035 159.7)
-
Step 200
200
#B3E7CB
oklch(88.4% 0.066 161.2)
-
Step 300
300 (this color)
#63CA99
oklch(76.4% 0.121 160.9)
-
Step 400
400
#00BE7F
oklch(70.8% 0.158 160.7)
-
Step 500
500
#00A36D
oklch(63.2% 0.141 160.9)
-
Step 600
600
#00895B
oklch(55.6% 0.124 161)
-
Step 700
700
#00734C
oklch(49.1% 0.109 161.2)
-
Step 800
800
#005E3D
oklch(42.6% 0.095 160.9)
-
Step 900
900
#004F32
oklch(37.7% 0.085 160.4)
-
Step 950
950
#002F1C
oklch(26.9% 0.06 160.5)
#63CA99 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) | #C8BD96 | 0.116 |
| Deuteranopia (no green cones) | #B8B29C | 0.112 |
| Tritanopia (no blue cones) | #42C9BC | 0.051 |
| Achromatopsia (no color) | #B7B7B7 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63CA99
#63CA99
oklch(76.4% 0.121 160.9)
- #E693C9
#E693C9
oklch(76.4% 0.12 341)
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 #63CA99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.023
- Soft Green #6FC276 ΔE 0.042
- Emerald #06D6A0 ΔE 0.043
- Greenblue #23C48B ΔE 0.047
- Seafoam Blue #78D1B6 ΔE 0.047
- Pale Teal #82CBB2 ΔE 0.048
- Dark Sea Green #8FBC8F ΔE 0.051
- Green Blue #01C08D ΔE 0.057
Use #63CA99 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.