#51AFDE
Closest named color: Turquoise Blue (#06B1C4). oklch(71.6% 0.112 233.1), rgb(81, 175, 222).
Aa
Black text reads best on this color (8.53:1).
About this color
#51AFDE is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.112 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.054 away. Black text reads best on it, at 8.53:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.53:1 |
| White text | 2.45:1 |
Values
| HEX | #51AFDE |
| RGB | rgb(81, 175, 222) |
| HSL | hsl(200, 68%, 59%) |
| OKLCH | oklch(71.6% 0.112 233.1) |
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 #51AFDE | 2.45:1 | Fails | Lc -53.1 | Large or bold text, headings |
| Black text on #51AFDE | 8.53:1 | AAA | Lc 55.9 | Large or bold text, headings |
| #51AFDE text on white | 2.45:1 | Fails | Lc 48.1 | Large or bold text, headings |
| #51AFDE text on black | 8.53:1 | AAA | Lc -53.9 | 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
#F0F7FB
oklch(97.2% 0.009 232.4)
-
Step 100
100
#DDEDF5
oklch(93.7% 0.02 229)
-
Step 200
200
#C1DEEF
oklch(88.5% 0.039 233.6)
-
Step 300
300
#93C9E7
oklch(80.9% 0.07 233.1)
-
Step 400
400 (this color)
#51AFDE
oklch(71.6% 0.112 233.1)
-
Step 500
500
#0095CB
oklch(63% 0.131 233.2)
-
Step 600
600
#007DAB
oklch(55.5% 0.115 233.2)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002A3D
oklch(26.9% 0.056 233.8)
#51AFDE 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) | #98ADE0 | 0.073 |
| Deuteranopia (no green cones) | #859FDD | 0.062 |
| Tritanopia (no blue cones) | #00BCBF | 0.074 |
| Achromatopsia (no color) | #A5A5A5 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51AFDE
#51AFDE
oklch(71.6% 0.112 233.1)
- #DA8F5E
#DA8F5E
oklch(71.6% 0.112 53.2)
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 #51AFDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.054
- Deep Sky Blue #00BFFF ΔE 0.057
- Greyblue #77A1B5 ΔE 0.066
- Vivid Sky Blue #4CC9F0 ΔE 0.070
- Bluegrey #85A3B2 ΔE 0.074
- Carolina Blue #8AB8FE ΔE 0.078
- Cornflower Blue #6495ED ΔE 0.080
- Bright Sky Blue #02CCFE ΔE 0.080
Use #51AFDE 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.