#257699
Closest named color: Sea Blue (#047495). oklch(53.4% 0.093 231.2), rgb(37, 118, 153).
Aa
White text reads best on this color (5.08:1).
About this color
#257699 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.093 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.016 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 4.13:1 |
| White text | 5.08:1 |
Values
| HEX | #257699 |
| RGB | rgb(37, 118, 153) |
| HSL | hsl(198, 61%, 37%) |
| OKLCH | oklch(53.4% 0.093 231.2) |
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 #257699 | 5.08:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #257699 | 4.13:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #257699 text on white | 5.08:1 | AA | Lc 74.8 | Content text, not long reading |
| #257699 text on black | 4.13:1 | AA large text | Lc -26.9 | 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
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE6
oklch(88.4% 0.024 231.9)
-
Step 300
300
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#75A9C3
oklch(70.8% 0.067 230.6)
-
Step 500
500
#4E93B4
oklch(63.1% 0.086 231)
-
Step 600
600 (this color)
#257699
oklch(53.4% 0.093 231.2)
-
Step 700
700
#1F6989
oklch(49.1% 0.087 231.3)
-
Step 800
800
#1C566F
oklch(42.8% 0.072 230.5)
-
Step 900
900
#1E475A
oklch(37.7% 0.056 230.9)
-
Step 950
950
#132A35
oklch(27.2% 0.035 230.7)
#257699 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) | #64749B | 0.062 |
| Deuteranopia (no green cones) | #556998 | 0.054 |
| Tritanopia (no blue cones) | #008082 | 0.056 |
| Achromatopsia (no color) | #6E6E6E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257699
#257699
oklch(53.4% 0.093 231.2)
- #975C37
#975C37
oklch(53.3% 0.093 51.6)
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 #257699, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.016
- Ocean Blue #03719C ΔE 0.022
- Ocean #017B92 ΔE 0.024
- Muted Blue #3B719F ΔE 0.025
- Dull Blue #49759C ΔE 0.030
- Cerulean #457B9D ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.033
- Nice Blue #107AB0 ΔE 0.035
Use #257699 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.