#51D5BB
Closest named color: Medium Aquamarine (#66CDAA). oklch(79.4% 0.121 177.6), rgb(81, 213, 187).
Aa
Black text reads best on this color (11.58:1).
About this color
#51D5BB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 79%, its chroma 0.121 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.027 away. Black text reads best on it, at 11.58:1.
| Hue family | Teals and cyans |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 11.58:1 |
| White text | 1.81:1 |
Values
| HEX | #51D5BB |
| RGB | rgb(81, 213, 187) |
| HSL | hsl(168, 61%, 58%) |
| OKLCH | oklch(79.4% 0.121 177.6) |
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 #51D5BB | 1.81:1 | Fails | Lc -37.5 | Non-text elements, placeholder text |
| Black text on #51D5BB | 11.58:1 | AAA | Lc 70.4 | Content text, not long reading |
| #51D5BB text on white | 1.81:1 | Fails | Lc 33.4 | Non-text elements, placeholder text |
| #51D5BB text on black | 11.58:1 | AAA | Lc -69.2 | 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
#D2F2EA
oklch(93.6% 0.035 178.8)
-
Step 200
200
#A9E8D9
oklch(88.4% 0.067 178.3)
-
Step 300
300 (this color)
#51D5BB
oklch(79.4% 0.121 177.6)
-
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)
#51D5BB 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) | #CDC9BA | 0.127 |
| Deuteranopia (no green cones) | #BABBBD | 0.121 |
| Tritanopia (no blue cones) | #00D8CD | 0.030 |
| Achromatopsia (no color) | #C0C0C0 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51D5BB
#51D5BB
oklch(79.4% 0.121 177.6)
- #FA9ABC
#FA9ABC
oklch(79.4% 0.121 357.5)
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 #51D5BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.027
- Seafoam Blue #78D1B6 ΔE 0.028
- Medium Turquoise #48D1CC ΔE 0.030
- Turquoise #40E0D0 ΔE 0.034
- Pale Teal #82CBB2 ΔE 0.042
- Dark Turquoise #00CED1 ΔE 0.048
- Emerald #06D6A0 ΔE 0.049
- Aqua Marine #2EE8BB ΔE 0.054
Use #51D5BB 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.