#51C8D2
Closest named color: Dark Turquoise (#00CED1). oklch(77% 0.106 202.9), rgb(81, 200, 210).
Aa
Black text reads best on this color (10.54:1).
About this color
#51C8D2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 77%, its chroma 0.106 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.029 away. Black text reads best on it, at 10.54:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (77%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 10.54:1 |
| White text | 1.99:1 |
Values
| HEX | #51C8D2 |
| RGB | rgb(81, 200, 210) |
| HSL | hsl(185, 59%, 57%) |
| OKLCH | oklch(77% 0.106 202.9) |
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 #51C8D2 | 1.99:1 | Fails | Lc -42.7 | Non-text elements, placeholder text |
| Black text on #51C8D2 | 10.54:1 | AAA | Lc 65.7 | Content text, not long reading |
| #51C8D2 text on white | 1.99:1 | Fails | Lc 38.3 | Non-text elements, placeholder text |
| #51C8D2 text on black | 10.54:1 | AAA | Lc -64.1 | 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
#EBF8FA
oklch(97% 0.014 207.9)
-
Step 100
100
#D3F0F3
oklch(93.5% 0.031 204.2)
-
Step 200
200
#ACE5EA
oklch(88.5% 0.058 202.9)
-
Step 300
300 (this color)
#51C8D2
oklch(77% 0.106 202.9)
-
Step 400
400
#00B6C2
oklch(70.7% 0.12 203.2)
-
Step 500
500
#009CA6
oklch(63.1% 0.107 202.8)
-
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)
#51C8D2 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) | #BAC0D3 | 0.107 |
| Deuteranopia (no green cones) | #A6B1D3 | 0.099 |
| Tritanopia (no blue cones) | #00CFCB | 0.034 |
| Achromatopsia (no color) | #B8B8B8 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C8D2
#51C8D2
oklch(77% 0.106 202.9)
- #F09994
#F09994
oklch(77% 0.105 23.4)
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 #51C8D2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.029
- Medium Turquoise #48D1CC ΔE 0.030
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Aqua Blue #02D8E9 ΔE 0.047
- Pale Teal #82CBB2 ΔE 0.060
- Seafoam Blue #78D1B6 ΔE 0.061
- Sky Blue #87CEEB ΔE 0.063
- Bright Sky Blue #02CCFE ΔE 0.063
Use #51C8D2 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.