#51C159
Closest named color: Algae Green (#21C36F). oklch(72.3% 0.176 144.7), rgb(81, 193, 89).
Aa
Black text reads best on this color (9.12:1).
About this color
#51C159 is a medium-light, vivid green. In OKLCH its lightness is 72%, its chroma 0.176 and its hue 145°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae Green (#21C36F), ΔE 0.028 away. Black text reads best on it, at 9.12:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.176) |
| Temperature | in between |
| Nearest name | Algae Green (#21C36F) |
| Black text | 9.12:1 |
| White text | 2.30:1 |
Values
| HEX | #51C159 |
| RGB | rgb(81, 193, 89) |
| HSL | hsl(124, 47%, 54%) |
| OKLCH | oklch(72.3% 0.176 144.7) |
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 #51C159 | 2.30:1 | Fails | Lc -49.9 | Large or bold text, headings |
| Black text on #51C159 | 9.12:1 | AAA | Lc 58.9 | Large or bold text, headings |
| #51C159 text on white | 2.30:1 | Fails | Lc 45.1 | Large or bold text, headings |
| #51C159 text on black | 9.12:1 | AAA | Lc -57.0 | Large or bold text, headings |
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
#F0F8EF
oklch(97.1% 0.015 142.2)
-
Step 100
100
#DDF0DD
oklch(93.6% 0.032 145.3)
-
Step 200
200
#C1E4C1
oklch(88.4% 0.06 145)
-
Step 300
300
#93D494
oklch(81% 0.111 144.8)
-
Step 400
400 (this color)
#51C159
oklch(72.3% 0.176 144.7)
-
Step 500
500
#00A62A
oklch(63% 0.2 144.8)
-
Step 600
600
#008C22
oklch(55.6% 0.176 144.8)
-
Step 700
700
#00761B
oklch(49.2% 0.156 144.8)
-
Step 800
800
#006114
oklch(42.8% 0.136 144.7)
-
Step 900
900
#00510F
oklch(37.8% 0.12 144.7)
-
Step 950
950
#003006
oklch(26.9% 0.085 144.8)
#51C159 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) | #C4B14F | 0.132 |
| Deuteranopia (no green cones) | #B6A761 | 0.132 |
| Tritanopia (no blue cones) | #3CBCAA | 0.110 |
| Achromatopsia (no color) | #ABABAB | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C159
#51C159
oklch(72.3% 0.176 144.7)
- #DB7AE2
#DB7AE2
oklch(72.3% 0.177 324.7)
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 #51C159, closest first.
No curated palette has a color within ΔE 0.04 of #51C159.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae Green #21C36F ΔE 0.028
- Dark Mint #48C072 ΔE 0.029
- Leafy Green #51B73B ΔE 0.034
- Shamrock Green #02C14D ΔE 0.034
- Dark Mint Green #20C073 ΔE 0.035
- Turtle Green #75B84F ΔE 0.035
- Cool Green #33B864 ΔE 0.037
- Soft Green #6FC276 ΔE 0.046
Use #51C159 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.