#51CEAF
Closest named color: Medium Aquamarine (#66CDAA). oklch(77.3% 0.12 173.8), rgb(81, 206, 175).
Aa
Black text reads best on this color (10.79:1).
About this color
#51CEAF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.120 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.015 away. Black text reads best on it, at 10.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.79:1 |
| White text | 1.94:1 |
Values
| HEX | #51CEAF |
| RGB | rgb(81, 206, 175) |
| HSL | hsl(165, 56%, 56%) |
| OKLCH | oklch(77.3% 0.12 173.8) |
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 #51CEAF | 1.94:1 | Fails | Lc -41.4 | Non-text elements, placeholder text |
| Black text on #51CEAF | 10.79:1 | AAA | Lc 66.9 | Content text, not long reading |
| #51CEAF text on white | 1.94:1 | Fails | Lc 37.0 | Non-text elements, placeholder text |
| #51CEAF text on black | 10.79:1 | AAA | Lc -65.4 | 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
#EBF9F4
oklch(97% 0.016 172.7)
-
Step 100
100
#D3F2E8
oklch(93.6% 0.035 174.1)
-
Step 200
200
#ACE8D5
oklch(88.5% 0.066 173.2)
-
Step 300
300 (this color)
#51CEAF
oklch(77.3% 0.12 173.8)
-
Step 400
400
#00BB9A
oklch(70.7% 0.134 174)
-
Step 500
500
#00A183
oklch(63.2% 0.121 173.2)
-
Step 600
600
#00876E
oklch(55.6% 0.106 173.6)
-
Step 700
700
#00725C
oklch(49.2% 0.094 173.1)
-
Step 800
800
#005D4B
oklch(42.7% 0.081 173.5)
-
Step 900
900
#004E3E
oklch(37.8% 0.073 172.9)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#51CEAF 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) | #C8C2AE | 0.125 |
| Deuteranopia (no green cones) | #B5B4B1 | 0.119 |
| Tritanopia (no blue cones) | #00D0C5 | 0.035 |
| Achromatopsia (no color) | #BABABA | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51CEAF
#51CEAF
oklch(77.3% 0.12 173.8)
- #F194BB
#F194BB
oklch(77.3% 0.121 353.6)
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 #51CEAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.015
- Seafoam Blue #78D1B6 ΔE 0.035
- Medium Turquoise #48D1CC ΔE 0.039
- Pale Teal #82CBB2 ΔE 0.041
- Emerald #06D6A0 ΔE 0.043
- Dark Turquoise #00CED1 ΔE 0.051
- Turquoise #40E0D0 ΔE 0.056
- Greenblue #23C48B ΔE 0.060
Use #51CEAF 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.