#51BB9D
Closest named color: Greeny Blue (#42B395). oklch(72.1% 0.108 171.8), rgb(81, 187, 157).
Aa
Black text reads best on this color (8.94:1).
About this color
#51BB9D is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.108 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.027 away. Black text reads best on it, at 8.94:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 8.94:1 |
| White text | 2.34:1 |
Values
| HEX | #51BB9D |
| RGB | rgb(81, 187, 157) |
| HSL | hsl(163, 44%, 53%) |
| OKLCH | oklch(72.1% 0.108 171.8) |
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 #51BB9D | 2.34:1 | Fails | Lc -51.0 | Large or bold text, headings |
| Black text on #51BB9D | 8.94:1 | AAA | Lc 57.9 | Large or bold text, headings |
| #51BB9D text on white | 2.34:1 | Fails | Lc 46.0 | Large or bold text, headings |
| #51BB9D text on black | 8.94:1 | AAA | Lc -56.0 | 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
#F0F7F5
oklch(97% 0.008 177.3)
-
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
#94CFBB
oklch(80.8% 0.067 171.5)
-
Step 400
400 (this color)
#51BB9D
oklch(72.1% 0.108 171.8)
-
Step 500
500
#00A181
oklch(63.2% 0.122 172)
-
Step 600
600
#00876C
oklch(55.5% 0.108 172.1)
-
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
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E23
oklch(26.8% 0.052 171.9)
#51BB9D 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) | #B6B09C | 0.112 |
| Deuteranopia (no green cones) | #A6A49F | 0.108 |
| Tritanopia (no blue cones) | #0FBCB2 | 0.036 |
| Achromatopsia (no color) | #A9A9A9 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51BB9D
#51BB9D
oklch(72.1% 0.108 171.8)
- #D988AC
#D988AC
oklch(72.1% 0.108 352)
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 #51BB9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.027
- Topaz #13BBAF ΔE 0.034
- Green Blue #01C08D ΔE 0.044
- Light Sea Green #20B2AA ΔE 0.045
- Greenblue #23C48B ΔE 0.048
- Tea #65AB7C ΔE 0.052
- Medium Aquamarine #66CDAA ΔE 0.056
- Faded Green #7BB274 ΔE 0.057
Use #51BB9D 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.