#257EB0
Closest named color: Nice Blue (#107AB0). oklch(56.5% 0.112 238.6), rgb(37, 126, 176).
Aa
Black text reads best on this color (4.68:1).
About this color
#257EB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.112 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.016 away. Black text reads best on it, at 4.68:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.68:1 |
| White text | 4.47:1 |
Values
| HEX | #257EB0 |
| RGB | rgb(37, 126, 176) |
| HSL | hsl(202, 65%, 42%) |
| OKLCH | oklch(56.5% 0.112 238.6) |
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 #257EB0 | 4.47:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #257EB0 | 4.68:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #257EB0 text on white | 4.47:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #257EB0 text on black | 4.68:1 | AA | Lc -31.0 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A3C6DE
oklch(80.9% 0.051 238.2)
-
Step 400
400
#70A8CD
oklch(70.7% 0.08 238.4)
-
Step 500
500
#4692C1
oklch(63.2% 0.103 238.5)
-
Step 600
600 (this color)
#257EB0
oklch(56.5% 0.112 238.6)
-
Step 700
700
#116895
oklch(49.2% 0.104 238.5)
-
Step 800
800
#145579
oklch(42.8% 0.086 238.7)
-
Step 900
900
#194661
oklch(37.7% 0.067 238.6)
-
Step 950
950
#102939
oklch(26.9% 0.043 239.2)
#257EB0 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) | #667EB2 | 0.060 |
| Deuteranopia (no green cones) | #5371AF | 0.049 |
| Tritanopia (no blue cones) | #008B8F | 0.075 |
| Achromatopsia (no color) | #777777 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257EB0
#257EB0
oklch(56.5% 0.112 238.6)
- #A66429
#A66429
oklch(56.6% 0.112 58.9)
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 #257EB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.016
- Steel Blue #4682B4 ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.032
- Windows Blue #3778BF ΔE 0.034
- Blue NCS #118AB2 ΔE 0.034
- Cerulean #457B9D ΔE 0.034
- Cool Blue #4984B8 ΔE 0.036
- Dull Blue #49759C ΔE 0.040
Use #257EB0 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.