#57B4FF
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.5% 0.14 245.6), rgb(87, 180, 255).
Aa
Black text reads best on this color (9.37:1).
About this color
#57B4FF is a medium-light, vivid blue. In OKLCH its lightness is 75%, its chroma 0.140 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.039 away. Black text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.37:1 |
| White text | 2.23:1 |
Values
| HEX | #57B4FF |
| RGB | rgb(87, 180, 255) |
| HSL | hsl(207, 100%, 67%) |
| OKLCH | oklch(74.5% 0.14 245.6) |
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 #57B4FF | 2.23:1 | Fails | Lc -48.6 | Large or bold text, headings |
| Black text on #57B4FF | 9.37:1 | AAA | Lc 60.1 | Content text, not long reading |
| #57B4FF text on white | 2.23:1 | Fails | Lc 43.8 | Non-text elements, placeholder text |
| #57B4FF text on black | 9.37:1 | AAA | Lc -58.3 | 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
#DDECFA
oklch(93.6% 0.025 246.2)
-
Step 200
200
#C0DDF8
oklch(88.5% 0.048 246.5)
-
Step 300
300
#91C7F6
oklch(80.9% 0.087 245.4)
-
Step 400
400 (this color)
#57B4FF
oklch(74.5% 0.14 245.6)
-
Step 500
500
#0090E3
oklch(63.2% 0.16 245.3)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#005386
oklch(42.8% 0.108 245.3)
-
Step 900
900
#004571
oklch(37.8% 0.096 245.5)
-
Step 950
950
#002846
oklch(26.9% 0.07 246.6)
#57B4FF 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) | #93B6FF | 0.060 |
| Deuteranopia (no green cones) | #7CA6FE | 0.046 |
| Tritanopia (no blue cones) | #00C6CE | 0.105 |
| Achromatopsia (no color) | #ADADAD | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57B4FF
#57B4FF
oklch(74.5% 0.14 245.6)
- #E8983E
#E8983E
oklch(74.5% 0.14 65.4)
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 #57B4FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.039
- Carolina Blue #8AB8FE ΔE 0.051
- Vivid Sky Blue #4CC9F0 ΔE 0.067
- Bright Sky Blue #02CCFE ΔE 0.068
- Lightblue #7BC8F6 ΔE 0.070
- Sky #82CAFC ΔE 0.077
- Cornflower Blue #6495ED ΔE 0.081
- Periwinkle Blue #8F99FB ΔE 0.083
Use #57B4FF 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.