#57ACEF
Closest named color: Deep Sky Blue (#00BFFF). oklch(72% 0.128 244.8), rgb(87, 172, 239).
Aa
Black text reads best on this color (8.55:1).
About this color
#57ACEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.128 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.054 away. Black text reads best on it, at 8.55:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 8.55:1 |
| White text | 2.45:1 |
Values
| HEX | #57ACEF |
| RGB | rgb(87, 172, 239) |
| HSL | hsl(206, 83%, 64%) |
| OKLCH | oklch(72% 0.128 244.8) |
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 #57ACEF | 2.45:1 | Fails | Lc -53.1 | Large or bold text, headings |
| Black text on #57ACEF | 8.55:1 | AAA | Lc 56.0 | Large or bold text, headings |
| #57ACEF text on white | 2.45:1 | Fails | Lc 48.0 | Large or bold text, headings |
| #57ACEF text on black | 8.55:1 | AAA | Lc -54.0 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C1DDF5
oklch(88.5% 0.045 244.2)
-
Step 300
300
#95C7F1
oklch(81% 0.079 244.3)
-
Step 400
400 (this color)
#57ACEF
oklch(72% 0.128 244.8)
-
Step 500
500
#0090E1
oklch(63.1% 0.158 244.7)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
Step 700
700
#0065A1
oklch(49% 0.124 245.1)
-
Step 800
800
#005385
oklch(42.7% 0.107 244.8)
-
Step 900
900
#004570
oklch(37.7% 0.095 244.9)
-
Step 950
950
#002945
oklch(27.1% 0.068 244.5)
#57ACEF 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) | #8EAEF2 | 0.057 |
| Deuteranopia (no green cones) | #7A9FEE | 0.045 |
| Tritanopia (no blue cones) | #00BCC3 | 0.097 |
| Achromatopsia (no color) | #A5A5A5 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57ACEF
#57ACEF
oklch(72% 0.128 244.8)
- #DB9244
#DB9244
oklch(71.9% 0.128 64.8)
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 #57ACEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.061
- Chefchaouen Blue #4895EF ΔE 0.066
- Carolina Blue #8AB8FE ΔE 0.066
- Periwinkle Blue #8F99FB ΔE 0.078
- Vivid Sky Blue #4CC9F0 ΔE 0.079
- Turquoise Blue #06B1C4 ΔE 0.081
- Bright Sky Blue #02CCFE ΔE 0.084
Use #57ACEF 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.