#57B4EC
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.6% 0.12 237.9), rgb(87, 180, 236).
Aa
Black text reads best on this color (9.14:1).
About this color
#57B4EC is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.120 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.041 away. Black text reads best on it, at 9.14:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.14:1 |
| White text | 2.29:1 |
Values
| HEX | #57B4EC |
| RGB | rgb(87, 180, 236) |
| HSL | hsl(203, 80%, 63%) |
| OKLCH | oklch(73.6% 0.12 237.9) |
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 #57B4EC | 2.29:1 | Fails | Lc -49.9 | Large or bold text, headings |
| Black text on #57B4EC | 9.14:1 | AAA | Lc 58.9 | Large or bold text, headings |
| #57B4EC text on white | 2.29:1 | Fails | Lc 45.0 | Large or bold text, headings |
| #57B4EC text on black | 9.14:1 | AAA | Lc -57.1 | 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
#DDECF7
oklch(93.5% 0.022 239.4)
-
Step 200
200
#C1DEF2
oklch(88.6% 0.041 238.1)
-
Step 300
300
#93C8EC
oklch(80.9% 0.075 238.6)
-
Step 400
400 (this color)
#57B4EC
oklch(73.6% 0.12 237.9)
-
Step 500
500
#0093D3
oklch(63% 0.14 238.1)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#002A40
oklch(27% 0.06 237.8)
#57B4EC 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) | #9AB3EF | 0.069 |
| Deuteranopia (no green cones) | #86A4EB | 0.058 |
| Tritanopia (no blue cones) | #00C2C7 | 0.084 |
| Achromatopsia (no color) | #ABABAB | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57B4EC
#57B4EC
oklch(73.6% 0.12 237.9)
- #E29659
#E29659
oklch(73.7% 0.12 58.2)
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 #57B4EC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.041
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Carolina Blue #8AB8FE ΔE 0.059
- Bright Sky Blue #02CCFE ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.067
- Turquoise Blue #06B1C4 ΔE 0.073
- Sky #82CAFC ΔE 0.076
- Light Cornflower Blue #98C1D9 ΔE 0.084
Use #57B4EC 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.