#51C658
Closest named color: Algae Green (#21C36F). oklch(73.5% 0.184 144.4), rgb(81, 198, 88).
Aa
Black text reads best on this color (9.56:1).
About this color
#51C658 is a medium-light, vivid green. In OKLCH its lightness is 74%, its chroma 0.184 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae Green (#21C36F), ΔE 0.034 away. Black text reads best on it, at 9.56:1.
| Hue family | Greens |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.184) |
| Temperature | in between |
| Nearest name | Algae Green (#21C36F) |
| Black text | 9.56:1 |
| White text | 2.19:1 |
Values
| HEX | #51C658 |
| RGB | rgb(81, 198, 88) |
| HSL | hsl(124, 51%, 55%) |
| OKLCH | oklch(73.5% 0.184 144.4) |
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 #51C658 | 2.19:1 | Fails | Lc -47.6 | Large or bold text, headings |
| Black text on #51C658 | 9.56:1 | AAA | Lc 61.1 | Content text, not long reading |
| #51C658 text on white | 2.19:1 | Fails | Lc 42.8 | Non-text elements, placeholder text |
| #51C658 text on black | 9.56:1 | AAA | Lc -59.4 | 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
#EFF8EF
oklch(97% 0.015 145.5)
-
Step 100
100
#DDF0DC
oklch(93.6% 0.033 143.9)
-
Step 200
200
#C0E5BF
oklch(88.5% 0.064 144.3)
-
Step 300
300
#91D491
oklch(80.8% 0.115 144.4)
-
Step 400
400 (this color)
#51C658
oklch(73.5% 0.184 144.4)
-
Step 500
500
#00A627
oklch(63% 0.201 144.5)
-
Step 600
600
#008C1F
oklch(55.6% 0.178 144.4)
-
Step 700
700
#007618
oklch(49.1% 0.157 144.4)
-
Step 800
800
#006112
oklch(42.8% 0.137 144.4)
-
Step 900
900
#00510E
oklch(37.8% 0.121 144.5)
-
Step 950
950
#003005
oklch(26.9% 0.086 144.4)
#51C658 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) | #C9B54D | 0.137 |
| Deuteranopia (no green cones) | #BBAB60 | 0.137 |
| Tritanopia (no blue cones) | #3AC1AD | 0.113 |
| Achromatopsia (no color) | #AFAFAF | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C658
#51C658
oklch(73.5% 0.184 144.4)
- #E17CE9
#E17CE9
oklch(73.6% 0.183 324.5)
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 #51C658, closest first.
No curated palette has a color within ΔE 0.04 of #51C658.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae Green #21C36F ΔE 0.034
- Apple #6ECB3C ΔE 0.036
- Shamrock Green #02C14D ΔE 0.037
- Dark Mint #48C072 ΔE 0.038
- Seaweed #18D17B ΔE 0.041
- Dark Mint Green #20C073 ΔE 0.043
- Turtle Green #75B84F ΔE 0.044
- Leafy Green #51B73B ΔE 0.044
Use #51C658 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.