#51BF91
Closest named color: Greenblue (#23C48B). oklch(72.8% 0.122 163.1), rgb(81, 191, 145).
Aa
Black text reads best on this color (9.21:1).
About this color
#51BF91 is a medium-light, moderately saturated green. In OKLCH its lightness is 73%, its chroma 0.122 and its hue 163°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.029 away. Black text reads best on it, at 9.21:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.122) |
| Temperature | in between |
| Nearest name | Greenblue (#23C48B) |
| Black text | 9.21:1 |
| White text | 2.27:1 |
Values
| HEX | #51BF91 |
| RGB | rgb(81, 191, 145) |
| HSL | hsl(155, 46%, 53%) |
| OKLCH | oklch(72.8% 0.122 163.1) |
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 #51BF91 | 2.27:1 | Fails | Lc -49.5 | Large or bold text, headings |
| Black text on #51BF91 | 9.21:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #51BF91 text on white | 2.27:1 | Fails | Lc 44.7 | Non-text elements, placeholder text |
| #51BF91 text on black | 9.21:1 | AAA | Lc -57.4 | 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
#F0F8F3
oklch(97.2% 0.011 158.8)
-
Step 100
100
#DDEFE6
oklch(93.6% 0.022 164.5)
-
Step 200
200
#C1E2D1
oklch(88.4% 0.042 163.1)
-
Step 300
300
#93D1B3
oklch(81% 0.077 163.1)
-
Step 400
400 (this color)
#51BF91
oklch(72.8% 0.122 163.1)
-
Step 500
500
#00A271
oklch(63% 0.136 163)
-
Step 600
600
#00895F
oklch(55.7% 0.12 163.1)
-
Step 700
700
#00734F
oklch(49.1% 0.106 163)
-
Step 800
800
#005E40
oklch(42.6% 0.092 163.1)
-
Step 900
900
#004F35
oklch(37.8% 0.082 162.9)
-
Step 950
950
#002F1E
oklch(27% 0.058 163)
#51BF91 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) | #BCB28E | 0.119 |
| Deuteranopia (no green cones) | #ACA794 | 0.115 |
| Tritanopia (no blue cones) | #1EBFB2 | 0.049 |
| Achromatopsia (no color) | #ACACAC | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BF91
#51BF91
oklch(72.8% 0.122 163.1)
- #DC87BB
#DC87BB
oklch(72.8% 0.122 343.2)
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 #51BF91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.029
- Green Blue #01C08D ΔE 0.030
- Greeny Blue #42B395 ΔE 0.040
- Soft Green #6FC276 ΔE 0.043
- Dark Mint #48C072 ΔE 0.044
- Faded Green #7BB274 ΔE 0.049
- Dark Seafoam #1FB57A ΔE 0.050
- Medium Aquamarine #66CDAA ΔE 0.051
Use #51BF91 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.