#51B7CD
Closest named color: Turquoise Blue (#06B1C4). oklch(72.8% 0.099 214.1), rgb(81, 183, 205).
Aa
Black text reads best on this color (9.00:1).
About this color
#51B7CD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.099 and its hue 214°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.039 away. Black text reads best on it, at 9.00:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 9.00:1 |
| White text | 2.33:1 |
Values
| HEX | #51B7CD |
| RGB | rgb(81, 183, 205) |
| HSL | hsl(191, 55%, 56%) |
| OKLCH | oklch(72.8% 0.099 214.1) |
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 #51B7CD | 2.33:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #51B7CD | 9.00:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #51B7CD text on white | 2.33:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #51B7CD text on black | 9.00:1 | AAA | Lc -56.3 | Large or bold text, headings |
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
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DDEDF1
oklch(93.5% 0.018 214.4)
-
Step 200
200
#C1E0E7
oklch(88.6% 0.034 212.9)
-
Step 300
300
#92CBD9
oklch(80.8% 0.062 214.6)
-
Step 400
400 (this color)
#51B7CD
oklch(72.8% 0.099 214.1)
-
Step 500
500
#009AB2
oklch(63.1% 0.111 213.9)
-
Step 600
600
#008196
oklch(55.5% 0.098 214.4)
-
Step 700
700
#006D7F
oklch(49.2% 0.087 214.3)
-
Step 800
800
#005968
oklch(42.7% 0.075 214.2)
-
Step 900
900
#004A57
oklch(37.6% 0.066 214.5)
-
Step 950
950
#002C35
oklch(27% 0.048 215.4)
#51B7CD 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) | #A7B1CE | 0.090 |
| Deuteranopia (no green cones) | #95A4CD | 0.081 |
| Tritanopia (no blue cones) | #00C0BE | 0.048 |
| Achromatopsia (no color) | #AAAAAA | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51B7CD
#51B7CD
oklch(72.8% 0.099 214.1)
- #DE907D
#DE907D
oklch(72.8% 0.099 34.4)
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 #51B7CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.039
- Topaz #13BBAF ΔE 0.059
- Light Sea Green #20B2AA ΔE 0.061
- Vivid Sky Blue #4CC9F0 ΔE 0.061
- Greyblue #77A1B5 ΔE 0.064
- Dark Turquoise #00CED1 ΔE 0.065
- Bluegrey #85A3B2 ΔE 0.068
- Deep Sky Blue #00BFFF ΔE 0.072
Use #51B7CD 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.