#57ADFD
Closest named color: Deep Sky Blue (#00BFFF). oklch(72.9% 0.143 248.9), rgb(87, 173, 253).
Aa
Black text reads best on this color (8.80:1).
About this color
#57ADFD is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.143 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.053 away. Black text reads best on it, at 8.80:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.80:1 |
| White text | 2.38:1 |
Values
| HEX | #57ADFD |
| RGB | rgb(87, 173, 253) |
| HSL | hsl(209, 98%, 67%) |
| OKLCH | oklch(72.9% 0.143 248.9) |
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 #57ADFD | 2.38:1 | Fails | Lc -51.7 | Large or bold text, headings |
| Black text on #57ADFD | 8.80:1 | AAA | Lc 57.2 | Large or bold text, headings |
| #57ADFD text on white | 2.38:1 | Fails | Lc 46.7 | Large or bold text, headings |
| #57ADFD text on black | 8.80:1 | AAA | Lc -55.3 | 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
#EFF6FD
oklch(97% 0.012 248)
-
Step 100
100
#DDECFB
oklch(93.6% 0.026 248.1)
-
Step 200
200
#C0DDF9
oklch(88.5% 0.05 247.5)
-
Step 300
300
#93C6F8
oklch(80.9% 0.089 248.5)
-
Step 400
400 (this color)
#57ADFD
oklch(72.9% 0.143 248.9)
-
Step 500
500
#008DEC
oklch(63.1% 0.173 248.9)
-
Step 600
600
#0076C8
oklch(55.5% 0.154 249.2)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#004376
oklch(37.6% 0.105 249.5)
-
Step 950
950
#002849
oklch(27.1% 0.074 248.8)
#57ADFD 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) | #8AB1FF | 0.053 |
| Deuteranopia (no green cones) | #73A1FB | 0.037 |
| Tritanopia (no blue cones) | #00C0CA | 0.110 |
| Achromatopsia (no color) | #A8A8A8 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57ADFD
#57ADFD
oklch(72.9% 0.143 248.9)
- #E1952E
#E1952E
oklch(73% 0.144 69.2)
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 #57ADFD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.053
- Carolina Blue #8AB8FE ΔE 0.061
- Cornflower Blue #6495ED ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.068
- Periwinkle Blue #8F99FB ΔE 0.072
- Vivid Sky Blue #4CC9F0 ΔE 0.084
- Bright Sky Blue #02CCFE ΔE 0.085
- Lightblue #7BC8F6 ΔE 0.087
Use #57ADFD 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.