#257EC6
Closest named color: Windows Blue (#3778BF). oklch(57.8% 0.137 247.9), rgb(37, 126, 198).
Aa
Black text reads best on this color (4.87:1).
About this color
#257EC6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.137 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. Black text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.87:1 |
| White text | 4.30:1 |
Values
| HEX | #257EC6 |
| RGB | rgb(37, 126, 198) |
| HSL | hsl(207, 69%, 46%) |
| OKLCH | oklch(57.8% 0.137 247.9) |
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 #257EC6 | 4.30:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #257EC6 | 4.87:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #257EC6 text on white | 4.30:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #257EC6 text on black | 4.87:1 | AA | Lc -32.3 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A2C5E7
oklch(80.9% 0.061 247.8)
-
Step 400
400
#6DA6DB
oklch(70.7% 0.098 247.6)
-
Step 500
500
#428FD2
oklch(63.2% 0.127 247.7)
-
Step 600
600 (this color)
#257EC6
oklch(57.8% 0.137 247.9)
-
Step 700
700
#0A64A5
oklch(49.1% 0.128 248)
-
Step 800
800
#105285
oklch(42.7% 0.105 247.7)
-
Step 900
900
#17446B
oklch(37.7% 0.083 248.3)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#257EC6 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) | #5C82C9 | 0.050 |
| Deuteranopia (no green cones) | #4473C5 | 0.034 |
| Tritanopia (no blue cones) | #008F98 | 0.099 |
| Achromatopsia (no color) | #7A7A7A | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257EC6
#257EC6
oklch(57.8% 0.137 247.9)
- #AA6900
#AA6900
oklch(57.9% 0.127 68.1)
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 #257EC6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.019
- Water Blue #0E87CC ΔE 0.025
- Nice Blue #107AB0 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.040
- Cool Blue #4984B8 ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.050
- Blue NCS #118AB2 ΔE 0.052
- Off Blue #5684AE ΔE 0.059
Use #257EC6 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.