#51C5CC
Closest named color: Dark Turquoise (#00CED1). oklch(76.1% 0.104 200.7), rgb(81, 197, 204).
Aa
Black text reads best on this color (10.20:1).
About this color
#51C5CC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.104 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.031 away. Black text reads best on it, at 10.20:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 10.20:1 |
| White text | 2.05:1 |
Values
| HEX | #51C5CC |
| RGB | rgb(81, 197, 204) |
| HSL | hsl(183, 55%, 56%) |
| OKLCH | oklch(76.1% 0.104 200.7) |
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 #51C5CC | 2.05:1 | Fails | Lc -44.4 | Non-text elements, placeholder text |
| Black text on #51C5CC | 10.20:1 | AAA | Lc 64.1 | Content text, not long reading |
| #51C5CC text on white | 2.05:1 | Fails | Lc 39.8 | Non-text elements, placeholder text |
| #51C5CC text on black | 10.20:1 | AAA | Lc -62.5 | 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
#EBF8F9
oklch(97% 0.014 202.5)
-
Step 100
100
#D4F0F2
oklch(93.5% 0.029 201.9)
-
Step 200
200
#ADE5E9
oklch(88.5% 0.057 201.7)
-
Step 300
300 (this color)
#51C5CC
oklch(76.1% 0.104 200.7)
-
Step 400
400
#00B6BF
oklch(70.6% 0.12 201.1)
-
Step 500
500
#009CA4
oklch(63% 0.107 201.2)
-
Step 600
600
#00838A
oklch(55.5% 0.094 201.4)
-
Step 700
700
#006E74
oklch(49% 0.083 201.4)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#004B4F
oklch(37.5% 0.064 200.9)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#51C5CC 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) | #B8BDCD | 0.106 |
| Deuteranopia (no green cones) | #A4AFCD | 0.097 |
| Tritanopia (no blue cones) | #00CCC7 | 0.033 |
| Achromatopsia (no color) | #B5B5B5 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51C5CC
#51C5CC
oklch(76.1% 0.104 200.7)
- #EC9695
#EC9695
oklch(76% 0.104 20.5)
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 #51C5CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.031
- Medium Turquoise #48D1CC ΔE 0.034
- Vivid Sky Blue #4CC9F0 ΔE 0.051
- Aqua Blue #02D8E9 ΔE 0.056
- Topaz #13BBAF ΔE 0.057
- Pale Teal #82CBB2 ΔE 0.059
- Medium Aquamarine #66CDAA ΔE 0.061
- Seafoam Blue #78D1B6 ΔE 0.062
Use #51C5CC 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.