#57B1F4
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.3% 0.13 243.5), rgb(87, 177, 244).
Aa
Black text reads best on this color (9.00:1).
About this color
#57B1F4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.130 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.043 away. Black text reads best on it, at 9.00:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.00:1 |
| White text | 2.33:1 |
Values
| HEX | #57B1F4 |
| RGB | rgb(87, 177, 244) |
| HSL | hsl(206, 88%, 65%) |
| OKLCH | oklch(73.3% 0.13 243.5) |
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 #57B1F4 | 2.33:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #57B1F4 | 9.00:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #57B1F4 text on white | 2.33:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #57B1F4 text on black | 9.00:1 | AAA | Lc -56.3 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DDECF9
oklch(93.6% 0.024 244.1)
-
Step 200
200
#C1DDF5
oklch(88.5% 0.045 244.2)
-
Step 300
300
#93C7F2
oklch(80.9% 0.082 244)
-
Step 400
400 (this color)
#57B1F4
oklch(73.3% 0.13 243.5)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#57B1F4 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) | #93B2F7 | 0.061 |
| Deuteranopia (no green cones) | #7EA3F3 | 0.048 |
| Tritanopia (no blue cones) | #00C1C8 | 0.096 |
| Achromatopsia (no color) | #AAAAAA | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #57B1F4
#57B1F4
oklch(73.3% 0.13 243.5)
- #E29548
#E29548
oklch(73.3% 0.131 63.1)
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 #57B1F4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.043
- Carolina Blue #8AB8FE ΔE 0.057
- Vivid Sky Blue #4CC9F0 ΔE 0.068
- Bright Sky Blue #02CCFE ΔE 0.072
- Cornflower Blue #6495ED ΔE 0.073
- Lightblue #7BC8F6 ΔE 0.075
- Chefchaouen Blue #4895EF ΔE 0.078
- Sky #82CAFC ΔE 0.083
Use #57B1F4 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.