#57A4EF
Closest named color: Cornflower Blue (#6495ED). oklch(70.2% 0.135 249.8), rgb(87, 164, 239).
Aa
Black text reads best on this color (7.96:1).
About this color
#57A4EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.135 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.040 away. Black text reads best on it, at 7.96:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.96:1 |
| White text | 2.63:1 |
Values
| HEX | #57A4EF |
| RGB | rgb(87, 164, 239) |
| HSL | hsl(210, 83%, 64%) |
| OKLCH | oklch(70.2% 0.135 249.8) |
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 #57A4EF | 2.63:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #57A4EF | 7.96:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #57A4EF text on white | 2.63:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #57A4EF text on black | 7.96:1 | AAA | Lc -50.8 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DEECFA
oklch(93.7% 0.024 248.1)
-
Step 200
200
#C2DCF7
oklch(88.4% 0.047 249.4)
-
Step 300
300
#97C5F5
oklch(80.8% 0.084 250)
-
Step 400
400 (this color)
#57A4EF
oklch(70.2% 0.135 249.8)
-
Step 500
500
#138DEC
oklch(63.2% 0.172 249.7)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#004377
oklch(37.7% 0.106 249.9)
-
Step 950
950
#032847
oklch(27.1% 0.07 248.8)
#57A4EF 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) | #83A7F2 | 0.047 |
| Deuteranopia (no green cones) | #6F99EE | 0.034 |
| Tritanopia (no blue cones) | #00B6BF | 0.106 |
| Achromatopsia (no color) | #9F9F9F | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57A4EF
#57A4EF
oklch(70.2% 0.135 249.8)
- #D48E30
#D48E30
oklch(70.2% 0.135 69.5)
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 #57A4EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.040
- Chefchaouen Blue #4895EF ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.064
- Periwinkle Blue #8F99FB ΔE 0.069
- Deep Sky Blue #00BFFF ΔE 0.072
- Soft Blue #6488EA ΔE 0.073
- Dodger Blue #1E90FF ΔE 0.075
- Carolina Blue #8AB8FE ΔE 0.081
Use #57A4EF 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.