#51CA90
Closest named color: Greenblue (#23C48B). oklch(75.5% 0.138 159.4), rgb(81, 202, 144).
Aa
Black text reads best on this color (10.20:1).
About this color
#51CA90 is a medium-light, moderately saturated green. In OKLCH its lightness is 76%, its chroma 0.138 and its hue 159°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.031 away. Black text reads best on it, at 10.20:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.138) |
| Temperature | in between |
| Nearest name | Greenblue (#23C48B) |
| Black text | 10.20:1 |
| White text | 2.05:1 |
Values
| HEX | #51CA90 |
| RGB | rgb(81, 202, 144) |
| HSL | hsl(151, 53%, 55%) |
| OKLCH | oklch(75.5% 0.138 159.4) |
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 #51CA90 | 2.05:1 | Fails | Lc -44.4 | Non-text elements, placeholder text |
| Black text on #51CA90 | 10.20:1 | AAA | Lc 64.1 | Content text, not long reading |
| #51CA90 text on white | 2.05:1 | Fails | Lc 39.8 | Non-text elements, placeholder text |
| #51CA90 text on black | 10.20:1 | AAA | Lc -62.5 | 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 400.
-
Step 50
50
#EFF8F3
oklch(97.1% 0.012 162.1)
-
Step 100
100
#DDEFE4
oklch(93.6% 0.024 159.1)
-
Step 200
200
#BFE3CE
oklch(88.4% 0.047 159.7)
-
Step 300
300
#8FD2AD
oklch(80.9% 0.086 159.5)
-
Step 400
400 (this color)
#51CA90
oklch(75.5% 0.138 159.4)
-
Step 500
500
#00A369
oklch(63.1% 0.144 159.3)
-
Step 600
600
#008958
oklch(55.6% 0.127 159.5)
-
Step 700
700
#007349
oklch(49% 0.112 159.4)
-
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)
#51CA90 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) | #C8BC8D | 0.130 |
| Deuteranopia (no green cones) | #B7B094 | 0.126 |
| Tritanopia (no blue cones) | #16C9BA | 0.061 |
| Achromatopsia (no color) | #B5B5B5 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CA90
#51CA90
oklch(75.5% 0.138 159.4)
- #E98BCC
#E98BCC
oklch(75.5% 0.139 339.5)
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 #51CA90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.031
- Soft Green #6FC276 ΔE 0.035
- Emerald #06D6A0 ΔE 0.036
- Medium Aquamarine #66CDAA ΔE 0.041
- Dark Mint #48C072 ΔE 0.043
- Green Blue #01C08D ΔE 0.044
- Seaweed #18D17B ΔE 0.046
- Dark Mint Green #20C073 ΔE 0.053
Use #51CA90 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.