#257AB2
Closest named color: Nice Blue (#107AB0). oklch(55.7% 0.117 242.6), rgb(37, 122, 178).
Aa
White text reads best on this color (4.66:1).
About this color
#257AB2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.117 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.009 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #257AB2 |
| RGB | rgb(37, 122, 178) |
| HSL | hsl(204, 66%, 42%) |
| OKLCH | oklch(55.7% 0.117 242.6) |
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 #257AB2 | 4.66:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #257AB2 | 4.50:1 | AA | Lc 32.1 | Non-text elements, placeholder text |
| #257AB2 text on white | 4.66:1 | AA | Lc 72.0 | Content text, not long reading |
| #257AB2 text on black | 4.50:1 | AA | Lc -29.7 | Dividers and decoration only |
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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E1EBF3
oklch(93.5% 0.015 241.8)
-
Step 200
200
#C9DCEB
oklch(88.5% 0.029 241.6)
-
Step 300
300
#A4C5E0
oklch(80.8% 0.052 243.1)
-
Step 400
400
#71A7D1
oklch(70.7% 0.084 242.8)
-
Step 500
500
#4890C5
oklch(63% 0.108 243)
-
Step 600
600 (this color)
#257AB2
oklch(55.7% 0.117 242.6)
-
Step 700
700
#156699
oklch(49% 0.109 242.9)
-
Step 800
800
#16547C
oklch(42.8% 0.09 242.2)
-
Step 900
900
#1A4564
oklch(37.6% 0.071 243.3)
-
Step 950
950
#11293A
oklch(27% 0.044 241.7)
#257AB2 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) | #607BB4 | 0.055 |
| Deuteranopia (no green cones) | #4C6EB1 | 0.042 |
| Tritanopia (no blue cones) | #00888E | 0.081 |
| Achromatopsia (no color) | #747474 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257AB2
#257AB2
oklch(55.7% 0.117 242.6)
- #A36219
#A36219
oklch(55.7% 0.117 62.9)
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 #257AB2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.009
- Flat Blue #3C73A8 ΔE 0.025
- Windows Blue #3778BF ΔE 0.026
- Muted Blue #3B719F ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Cerulean #457B9D ΔE 0.040
- Dull Blue #49759C ΔE 0.041
- Cool Blue #4984B8 ΔE 0.043
Use #257AB2 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.