#257599
Closest named color: Sea Blue (#047495). oklch(53.1% 0.094 232.2), rgb(37, 117, 153).
Aa
White text reads best on this color (5.14:1).
About this color
#257599 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.094 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.015 away. White text reads best on it, at 5.14:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 4.08:1 |
| White text | 5.14:1 |
Values
| HEX | #257599 |
| RGB | rgb(37, 117, 153) |
| HSL | hsl(199, 61%, 37%) |
| OKLCH | oklch(53.1% 0.094 232.2) |
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 #257599 | 5.14:1 | AA | Lc -80.5 | Fine for body text |
| Black text on #257599 | 4.08:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #257599 text on white | 5.14:1 | AA | Lc 75.1 | Fine for body text |
| #257599 text on black | 4.08:1 | AA large text | Lc -26.6 | 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
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A6C6D8
oklch(80.9% 0.043 232.7)
-
Step 400
400
#75A8C4
oklch(70.6% 0.068 233)
-
Step 500
500
#4E93B5
oklch(63.2% 0.086 231.8)
-
Step 600
600 (this color)
#257599
oklch(53.1% 0.094 232.2)
-
Step 700
700
#1F698A
oklch(49.2% 0.088 232.2)
-
Step 800
800
#1D5670
oklch(42.8% 0.072 231.8)
-
Step 900
900
#1E475A
oklch(37.7% 0.056 230.9)
-
Step 950
950
#132935
oklch(26.9% 0.036 234.1)
#257599 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) | #63749B | 0.062 |
| Deuteranopia (no green cones) | #536998 | 0.051 |
| Tritanopia (no blue cones) | #007F81 | 0.057 |
| Achromatopsia (no color) | #6D6D6D | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257599
#257599
oklch(53.1% 0.094 232.2)
- #965B36
#965B36
oklch(53% 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 #257599, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.015
- Ocean Blue #03719C ΔE 0.020
- Muted Blue #3B719F ΔE 0.023
- Ocean #017B92 ΔE 0.026
- Dull Blue #49759C ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.032
- Cerulean #457B9D ΔE 0.034
- Nice Blue #107AB0 ΔE 0.036
Use #257599 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.