#51D899
Closest named color: Emerald (#06D6A0). oklch(79.2% 0.149 159.6), rgb(81, 216, 153).
Aa
Black text reads best on this color (11.63:1).
About this color
#51D899 is a light, vivid green. In OKLCH its lightness is 79%, its chroma 0.149 and its hue 160°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.026 away. Black text reads best on it, at 11.63:1.
| Hue family | Greens |
| Lightness | light (79%) |
| Chroma | vivid (0.149) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 11.63:1 |
| White text | 1.80:1 |
Values
| HEX | #51D899 |
| RGB | rgb(81, 216, 153) |
| HSL | hsl(152, 63%, 58%) |
| OKLCH | oklch(79.2% 0.149 159.6) |
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 #51D899 | 1.80:1 | Fails | Lc -37.2 | Non-text elements, placeholder text |
| Black text on #51D899 | 11.63:1 | AAA | Lc 70.7 | Content text, not long reading |
| #51D899 text on white | 1.80:1 | Fails | Lc 33.2 | Non-text elements, placeholder text |
| #51D899 text on black | 11.63:1 | AAA | Lc -69.4 | 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
#EBFAF1
oklch(97.2% 0.02 159.8)
-
Step 100
100
#D2F3E0
oklch(93.5% 0.043 160.2)
-
Step 200
200
#A9EBC6
oklch(88.6% 0.084 159.5)
-
Step 300
300 (this color)
#51D899
oklch(79.2% 0.149 159.6)
-
Step 400
400
#00BE7C
oklch(70.7% 0.161 159.6)
-
Step 500
500
#00A36A
oklch(63.1% 0.143 159.7)
-
Step 600
600
#008958
oklch(55.6% 0.127 159.5)
-
Step 700
700
#00734A
oklch(49% 0.111 160)
-
Step 800
800
#005F3B
oklch(42.8% 0.098 159.1)
-
Step 900
900
#004F31
oklch(37.7% 0.086 159.7)
-
Step 950
950
#002F1B
oklch(26.9% 0.062 159.3)
#51D899 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) | #D6C995 | 0.140 |
| Deuteranopia (no green cones) | #C3BC9D | 0.135 |
| Tritanopia (no blue cones) | #00D7C7 | 0.065 |
| Achromatopsia (no color) | #C1C1C1 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51D899
#51D899
oklch(79.2% 0.149 159.6)
- #F993DA
#F993DA
oklch(79.1% 0.149 339.3)
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 #51D899, closest first.
No curated palette has a color within ΔE 0.04 of #51D899.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.026
- Aqua Green #12E193 ΔE 0.035
- Medium Aquamarine #66CDAA ΔE 0.047
- Seaweed #18D17B ΔE 0.050
- Aqua Marine #2EE8BB ΔE 0.051
- Weird Green #3AE57F ΔE 0.057
- Seafoam Blue #78D1B6 ΔE 0.060
- Soft Green #6FC276 ΔE 0.062
Use #51D899 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.