#51C8A7
Closest named color: Medium Aquamarine (#66CDAA). oklch(75.6% 0.118 171.8), rgb(81, 200, 167).
Aa
Black text reads best on this color (10.16:1).
About this color
#51C8A7 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.118 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.023 away. Black text reads best on it, at 10.16:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.16:1 |
| White text | 2.06:1 |
Values
| HEX | #51C8A7 |
| RGB | rgb(81, 200, 167) |
| HSL | hsl(163, 52%, 55%) |
| OKLCH | oklch(75.6% 0.118 171.8) |
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 #51C8A7 | 2.06:1 | Fails | Lc -44.6 | Non-text elements, placeholder text |
| Black text on #51C8A7 | 10.16:1 | AAA | Lc 63.9 | Content text, not long reading |
| #51C8A7 text on white | 2.06:1 | Fails | Lc 40.0 | Non-text elements, placeholder text |
| #51C8A7 text on black | 10.16:1 | AAA | Lc -62.3 | 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
#EFF8F5
oklch(97.2% 0.01 174.3)
-
Step 100
100
#DDEFE8
oklch(93.7% 0.021 170.6)
-
Step 200
200
#BFE2D6
oklch(88.4% 0.04 172.6)
-
Step 300
300
#8FD1BB
oklch(81% 0.074 171.5)
-
Step 400
400 (this color)
#51C8A7
oklch(75.6% 0.118 171.8)
-
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)
#51C8A7 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) | #C2BCA5 | 0.121 |
| Deuteranopia (no green cones) | #B1AFA9 | 0.117 |
| Tritanopia (no blue cones) | #00CABE | 0.036 |
| Achromatopsia (no color) | #B4B4B4 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C8A7
#51C8A7
oklch(75.6% 0.118 171.8)
- #E990B8
#E990B8
oklch(75.7% 0.118 351.8)
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 #51C8A7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.023
- Seafoam Blue #78D1B6 ΔE 0.047
- Pale Teal #82CBB2 ΔE 0.047
- Greenblue #23C48B ΔE 0.048
- Emerald #06D6A0 ΔE 0.049
- Medium Turquoise #48D1CC ΔE 0.050
- Topaz #13BBAF ΔE 0.053
- Green Blue #01C08D ΔE 0.053
Use #51C8A7 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.