#51BC9D
Closest named color: Greeny Blue (#42B395). oklch(72.4% 0.109 171.3), rgb(81, 188, 157).
Aa
Black text reads best on this color (9.03:1).
About this color
#51BC9D is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.109 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.030 away. Black text reads best on it, at 9.03:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 9.03:1 |
| White text | 2.32:1 |
Values
| HEX | #51BC9D |
| RGB | rgb(81, 188, 157) |
| HSL | hsl(163, 44%, 53%) |
| OKLCH | oklch(72.4% 0.109 171.3) |
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 #51BC9D | 2.32:1 | Fails | Lc -50.5 | Large or bold text, headings |
| Black text on #51BC9D | 9.03:1 | AAA | Lc 58.4 | Large or bold text, headings |
| #51BC9D text on white | 2.32:1 | Fails | Lc 45.6 | Large or bold text, headings |
| #51BC9D text on black | 9.03:1 | AAA | Lc -56.5 | 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
#F0F8F5
oklch(97.2% 0.009 171.8)
-
Step 100
100
#DEEEE8
oklch(93.6% 0.019 171.5)
-
Step 200
200
#C1E2D6
oklch(88.5% 0.038 171.4)
-
Step 300
300
#93CFBB
oklch(80.8% 0.068 171.8)
-
Step 400
400 (this color)
#51BC9D
oklch(72.4% 0.109 171.3)
-
Step 500
500
#00A180
oklch(63.1% 0.123 171.4)
-
Step 600
600
#00876B
oklch(55.5% 0.108 171.4)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D49
oklch(42.6% 0.083 171.6)
-
Step 900
900
#004E3C
oklch(37.7% 0.074 170.6)
-
Step 950
950
#002F23
oklch(27.2% 0.053 170.5)
#51BC9D 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) | #B7B19C | 0.113 |
| Deuteranopia (no green cones) | #A7A59F | 0.108 |
| Tritanopia (no blue cones) | #0EBDB3 | 0.037 |
| Achromatopsia (no color) | #AAAAAA | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BC9D
#51BC9D
oklch(72.4% 0.109 171.3)
- #DA89AE
#DA89AE
oklch(72.4% 0.109 351.2)
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 #51BC9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.030
- Topaz #13BBAF ΔE 0.035
- Green Blue #01C08D ΔE 0.042
- Greenblue #23C48B ΔE 0.046
- Light Sea Green #20B2AA ΔE 0.048
- Medium Aquamarine #66CDAA ΔE 0.053
- Tea #65AB7C ΔE 0.054
- Faded Green #7BB274 ΔE 0.057
Use #51BC9D 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.