#51CA8B
Closest named color: Greenblue (#23C48B). oklch(75.4% 0.143 157.4), rgb(81, 202, 139).
Aa
Black text reads best on this color (10.17:1).
About this color
#51CA8B is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.143 and its hue 157°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.030 away. Black text reads best on it, at 10.17:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.143) |
| Temperature | in between |
| Nearest name | Greenblue (#23C48B) |
| Black text | 10.17:1 |
| White text | 2.06:1 |
Values
| HEX | #51CA8B |
| RGB | rgb(81, 202, 139) |
| HSL | hsl(149, 53%, 55%) |
| OKLCH | oklch(75.4% 0.143 157.4) |
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 #51CA8B | 2.06:1 | Fails | Lc -44.5 | Non-text elements, placeholder text |
| Black text on #51CA8B | 10.17:1 | AAA | Lc 64.0 | Content text, not long reading |
| #51CA8B text on white | 2.06:1 | Fails | Lc 40.0 | Non-text elements, placeholder text |
| #51CA8B text on black | 10.17:1 | AAA | Lc -62.3 | 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
#EFF8F2
oklch(97.1% 0.012 157)
-
Step 100
100
#DDEFE3
oklch(93.5% 0.025 156.7)
-
Step 200
200
#BFE4CC
oklch(88.6% 0.051 156.8)
-
Step 300
300
#8FD2AA
oklch(80.8% 0.089 157.5)
-
Step 400
400 (this color)
#51CA8B
oklch(75.4% 0.143 157.4)
-
Step 500
500
#00A364
oklch(63% 0.149 157.4)
-
Step 600
600
#008954
oklch(55.5% 0.13 157.7)
-
Step 700
700
#007446
oklch(49.2% 0.116 157.5)
-
Step 800
800
#005F38
oklch(42.7% 0.101 157.3)
-
Step 900
900
#004F2E
oklch(37.6% 0.089 157.5)
-
Step 950
950
#002F1A
oklch(26.9% 0.063 158.2)
#51CA8B 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) | #C9BB87 | 0.132 |
| Deuteranopia (no green cones) | #B8B08F | 0.127 |
| Tritanopia (no blue cones) | #1CC9B9 | 0.065 |
| Achromatopsia (no color) | #B4B4B4 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CA8B
#51CA8B
oklch(75.4% 0.143 157.4)
- #E88ACF
#E88ACF
oklch(75.4% 0.142 337.5)
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 #51CA8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.030
- Soft Green #6FC276 ΔE 0.031
- Emerald #06D6A0 ΔE 0.038
- Dark Mint #48C072 ΔE 0.039
- Seaweed #18D17B ΔE 0.041
- Green Blue #01C08D ΔE 0.044
- Medium Aquamarine #66CDAA ΔE 0.047
- Algae Green #21C36F ΔE 0.048
Use #51CA8B 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.