#51C1CB
Closest named color: Dark Turquoise (#00CED1). oklch(75.1% 0.102 203.4), rgb(81, 193, 203).
Aa
Black text reads best on this color (9.84:1).
About this color
#51C1CB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.102 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.039 away. Black text reads best on it, at 9.84:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 9.84:1 |
| White text | 2.13:1 |
Values
| HEX | #51C1CB |
| RGB | rgb(81, 193, 203) |
| HSL | hsl(185, 54%, 56%) |
| OKLCH | oklch(75.1% 0.102 203.4) |
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 #51C1CB | 2.13:1 | Fails | Lc -46.3 | Large or bold text, headings |
| Black text on #51C1CB | 9.84:1 | AAA | Lc 62.3 | Content text, not long reading |
| #51C1CB text on white | 2.13:1 | Fails | Lc 41.6 | Non-text elements, placeholder text |
| #51C1CB text on black | 9.84:1 | AAA | Lc -60.6 | 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
#EFF7F8
oklch(97% 0.009 205.9)
-
Step 100
100
#DDEEEF
oklch(93.7% 0.018 201.1)
-
Step 200
200
#BFE0E4
oklch(88.4% 0.035 205.5)
-
Step 300
300
#8FCDD3
oklch(80.8% 0.064 203.6)
-
Step 400
400 (this color)
#51C1CB
oklch(75.1% 0.102 203.4)
-
Step 500
500
#009CA7
oklch(63.1% 0.108 203.6)
-
Step 600
600
#00838C
oklch(55.6% 0.095 203.3)
-
Step 700
700
#006E76
oklch(49.1% 0.084 203.6)
-
Step 800
800
#005A61
oklch(42.6% 0.073 204)
-
Step 900
900
#004B51
oklch(37.6% 0.064 204)
-
Step 950
950
#002D30
oklch(27% 0.046 201.8)
#51C1CB 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) | #B3B9CC | 0.102 |
| Deuteranopia (no green cones) | #A0ACCC | 0.093 |
| Tritanopia (no blue cones) | #00C8C4 | 0.036 |
| Achromatopsia (no color) | #B1B1B1 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C1CB
#51C1CB
oklch(75.1% 0.102 203.4)
- #E8948F
#E8948F
oklch(75.1% 0.102 23.5)
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 #51C1CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.039
- Medium Turquoise #48D1CC ΔE 0.045
- Vivid Sky Blue #4CC9F0 ΔE 0.052
- Topaz #13BBAF ΔE 0.053
- Turquoise Blue #06B1C4 ΔE 0.058
- Aqua Blue #02D8E9 ΔE 0.065
- Pale Teal #82CBB2 ΔE 0.066
- Light Sea Green #20B2AA ΔE 0.067
Use #51C1CB 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.