#51C968
Closest named color: Seaweed (#18D17B). oklch(74.5% 0.173 147.3), rgb(81, 201, 104).
Aa
Black text reads best on this color (9.90:1).
About this color
#51C968 is a medium-light, vivid green. In OKLCH its lightness is 75%, its chroma 0.173 and its hue 147°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.029 away. Black text reads best on it, at 9.90:1.
| Hue family | Greens |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.173) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 9.90:1 |
| White text | 2.12:1 |
Values
| HEX | #51C968 |
| RGB | rgb(81, 201, 104) |
| HSL | hsl(132, 53%, 55%) |
| OKLCH | oklch(74.5% 0.173 147.3) |
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 #51C968 | 2.12:1 | Fails | Lc -45.8 | Large or bold text, headings |
| Black text on #51C968 | 9.90:1 | AAA | Lc 62.7 | Content text, not long reading |
| #51C968 text on white | 2.12:1 | Fails | Lc 41.2 | Non-text elements, placeholder text |
| #51C968 text on black | 9.90:1 | AAA | Lc -61.0 | 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
#EFF8F0
oklch(97% 0.014 148.8)
-
Step 100
100
#DDF0DE
oklch(93.6% 0.031 146.8)
-
Step 200
200
#C0E5C3
oklch(88.6% 0.06 147.3)
-
Step 300
300
#90D498
oklch(80.9% 0.108 147.4)
-
Step 400
400 (this color)
#51C968
oklch(74.5% 0.173 147.3)
-
Step 500
500
#00A63E
oklch(63.2% 0.186 147.4)
-
Step 600
600
#008B33
oklch(55.5% 0.163 147.4)
-
Step 700
700
#007529
oklch(49% 0.144 147.3)
-
Step 800
800
#006020
oklch(42.6% 0.126 147.3)
-
Step 900
900
#00501A
oklch(37.6% 0.11 147.5)
-
Step 950
950
#00300C
oklch(26.9% 0.079 147.3)
#51C968 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) | #CBB960 | 0.137 |
| Deuteranopia (no green cones) | #BCAE6F | 0.136 |
| Tritanopia (no blue cones) | #34C5B2 | 0.101 |
| Achromatopsia (no color) | #B2B2B2 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C968
#51C968
oklch(74.5% 0.173 147.3)
- #E581E4
#E581E4
oklch(74.6% 0.173 327.5)
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 #51C968, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.029
- Algae Green #21C36F ΔE 0.032
- Dark Mint #48C072 ΔE 0.032
- Soft Green #6FC276 ΔE 0.039
- Dark Mint Green #20C073 ΔE 0.041
- Apple #6ECB3C ΔE 0.043
- Turtle Green #75B84F ΔE 0.049
- Shamrock Green #02C14D ΔE 0.049
Use #51C968 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.