#257598
Closest named color: Sea Blue (#047495). oklch(53.1% 0.093 231.4), rgb(37, 117, 152).
Aa
White text reads best on this color (5.15:1).
About this color
#257598 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 0.014 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #257598 |
| RGB | rgb(37, 117, 152) |
| HSL | hsl(198, 61%, 37%) |
| OKLCH | oklch(53.1% 0.093 231.4) |
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 #257598 | 5.15:1 | AA | Lc -80.6 | Fine for body text |
| Black text on #257598 | 4.07:1 | AA large text | Lc 28.9 | Dividers and decoration only |
| #257598 text on white | 5.15:1 | AA | Lc 75.2 | Fine for body text |
| #257598 text on black | 4.07:1 | AA large text | Lc -26.5 | 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
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#75A9C3
oklch(70.8% 0.067 230.6)
-
Step 500
500
#4F93B4
oklch(63.2% 0.085 231.3)
-
Step 600
600 (this color)
#257598
oklch(53.1% 0.093 231.4)
-
Step 700
700
#206989
oklch(49.1% 0.086 231.5)
-
Step 800
800
#1D566F
oklch(42.8% 0.071 230.8)
-
Step 900
900
#1E475A
oklch(37.7% 0.056 230.9)
-
Step 950
950
#132A35
oklch(27.2% 0.035 230.7)
#257598 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) | #63749A | 0.062 |
| Deuteranopia (no green cones) | #546897 | 0.054 |
| Tritanopia (no blue cones) | #007F81 | 0.056 |
| Achromatopsia (no color) | #6D6D6D | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257598
#257598
oklch(53.1% 0.093 231.4)
- #965B37
#965B37
oklch(53% 0.093 51)
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 #257598, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.014
- Ocean Blue #03719C ΔE 0.020
- Muted Blue #3B719F ΔE 0.024
- Ocean #017B92 ΔE 0.025
- Dull Blue #49759C ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.034
- Cerulean #457B9D ΔE 0.034
- Nice Blue #107AB0 ΔE 0.037
Use #257598 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.