#257EC0
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.13 245.8), rgb(37, 126, 192).
Aa
Black text reads best on this color (4.82:1).
About this color
#257EC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.130 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.018 away. Black text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.82:1 |
| White text | 4.35:1 |
Values
| HEX | #257EC0 |
| RGB | rgb(37, 126, 192) |
| HSL | hsl(206, 68%, 45%) |
| OKLCH | oklch(57.4% 0.13 245.8) |
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 #257EC0 | 4.35:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #257EC0 | 4.82:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #257EC0 text on white | 4.35:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #257EC0 text on black | 4.82:1 | AA | Lc -31.9 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C8DCEE
oklch(88.5% 0.033 245.3)
-
Step 300
300
#A2C5E5
oklch(80.9% 0.059 246.2)
-
Step 400
400
#6EA7D8
oklch(70.8% 0.094 245.6)
-
Step 500
500
#438FCD
oklch(63% 0.12 246)
-
Step 600
600 (this color)
#257EC0
oklch(57.4% 0.13 245.8)
-
Step 700
700
#0C65A0
oklch(49.1% 0.121 245.7)
-
Step 800
800
#115382
oklch(42.8% 0.1 245.6)
-
Step 900
900
#184568
oklch(37.8% 0.077 245.6)
-
Step 950
950
#0F283D
oklch(26.8% 0.05 246.5)
#257EC0 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) | #5F81C3 | 0.052 |
| Deuteranopia (no green cones) | #4973BF | 0.037 |
| Tritanopia (no blue cones) | #008E96 | 0.092 |
| Achromatopsia (no color) | #797979 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257EC0
#257EC0
oklch(57.4% 0.13 245.8)
- #AA6600
#AA6600
oklch(57.3% 0.128 65.9)
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 #257EC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.018
- Water Blue #0E87CC ΔE 0.028
- Nice Blue #107AB0 ΔE 0.029
- Steel Blue #4682B4 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.043
- Blue NCS #118AB2 ΔE 0.045
- Off Blue #5684AE ΔE 0.054
Use #257EC0 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.