#51D1B8
Closest named color: Medium Aquamarine (#66CDAA). oklch(78.3% 0.118 177.8), rgb(81, 209, 184).
Aa
Black text reads best on this color (11.16:1).
About this color
#51D1B8 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 78%, its chroma 0.118 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.021 away. Black text reads best on it, at 11.16:1.
| Hue family | Teals and cyans |
| Lightness | light (78%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 11.16:1 |
| White text | 1.88:1 |
Values
| HEX | #51D1B8 |
| RGB | rgb(81, 209, 184) |
| HSL | hsl(168, 58%, 57%) |
| OKLCH | oklch(78.3% 0.118 177.8) |
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 #51D1B8 | 1.88:1 | Fails | Lc -39.6 | Non-text elements, placeholder text |
| Black text on #51D1B8 | 11.16:1 | AAA | Lc 68.5 | Content text, not long reading |
| #51D1B8 text on white | 1.88:1 | Fails | Lc 35.4 | Non-text elements, placeholder text |
| #51D1B8 text on black | 11.16:1 | AAA | Lc -67.2 | 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 300.
-
Step 50
50
#EBF9F5
oklch(97.1% 0.016 177.1)
-
Step 100
100
#D3F2EA
oklch(93.7% 0.034 178.3)
-
Step 200
200
#AAE8D9
oklch(88.5% 0.066 178.1)
-
Step 300
300 (this color)
#51D1B8
oklch(78.3% 0.118 177.8)
-
Step 400
400
#00BAA0
oklch(70.6% 0.13 177.9)
-
Step 500
500
#00A089
oklch(63.1% 0.116 177.6)
-
Step 600
600
#008673
oklch(55.5% 0.102 178.1)
-
Step 700
700
#007160
oklch(49.1% 0.091 177.4)
-
Step 800
800
#005D4F
oklch(42.8% 0.079 177.8)
-
Step 900
900
#004D41
oklch(37.6% 0.069 177.7)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#51D1B8 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) | #C9C5B7 | 0.125 |
| Deuteranopia (no green cones) | #B6B7BA | 0.119 |
| Tritanopia (no blue cones) | #00D4C9 | 0.029 |
| Achromatopsia (no color) | #BDBDBD | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51D1B8
#51D1B8
oklch(78.3% 0.118 177.8)
- #F598B8
#F598B8
oklch(78.3% 0.117 358)
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 #51D1B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.021
- Medium Turquoise #48D1CC ΔE 0.028
- Seafoam Blue #78D1B6 ΔE 0.029
- Pale Teal #82CBB2 ΔE 0.039
- Turquoise #40E0D0 ΔE 0.044
- Dark Turquoise #00CED1 ΔE 0.044
- Emerald #06D6A0 ΔE 0.049
- Tiffany Blue #94D2BD ΔE 0.059
Use #51D1B8 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.