#257CA8
Closest named color: Nice Blue (#107AB0). oklch(55.6% 0.105 235.7), rgb(37, 124, 168).
Aa
White text reads best on this color (4.63:1).
About this color
#257CA8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.105 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Nice Blue (#107AB0), ΔE 0.017 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Nice Blue (#107AB0) |
| Black text | 4.52:1 |
| White text | 4.63:1 |
Values
| HEX | #257CA8 |
| RGB | rgb(37, 124, 168) |
| HSL | hsl(200, 64%, 40%) |
| OKLCH | oklch(55.6% 0.105 235.7) |
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 #257CA8 | 4.63:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #257CA8 | 4.52:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #257CA8 text on white | 4.63:1 | AA | Lc 71.9 | Content text, not long reading |
| #257CA8 text on black | 4.52:1 | AA | Lc -29.8 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2ECF2
oklch(93.7% 0.013 233.7)
-
Step 200
200
#C9DCE8
oklch(88.4% 0.026 235.4)
-
Step 300
300
#A4C6DB
oklch(80.9% 0.047 235.3)
-
Step 400
400
#71A8C9
oklch(70.6% 0.075 235.7)
-
Step 500
500
#4892BC
oklch(63% 0.097 236)
-
Step 600
600 (this color)
#257CA8
oklch(55.6% 0.105 235.7)
-
Step 700
700
#156890
oklch(49% 0.098 235.9)
-
Step 800
800
#165575
oklch(42.7% 0.081 235.9)
-
Step 900
900
#1B465E
oklch(37.6% 0.063 236.3)
-
Step 950
950
#112937
oklch(26.9% 0.04 236.4)
#257CA8 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) | #677BAA | 0.063 |
| Deuteranopia (no green cones) | #556FA7 | 0.052 |
| Tritanopia (no blue cones) | #00878B | 0.065 |
| Achromatopsia (no color) | #757575 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257CA8
#257CA8
oklch(55.6% 0.105 235.7)
- #A16131
#A16131
oklch(55.5% 0.104 55.3)
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 #257CA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Nice Blue #107AB0 ΔE 0.017
- Cerulean #457B9D ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.028
- Muted Blue #3B719F ΔE 0.032
- Dull Blue #49759C ΔE 0.033
- Steel Blue #4682B4 ΔE 0.037
- Stormy Blue #507B9C ΔE 0.037
- Ocean #017B92 ΔE 0.039
Use #257CA8 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.