#257387
Closest named color: Sea Blue (#047495). oklch(51.8% 0.08 218.5), rgb(37, 115, 135).
Aa
White text reads best on this color (5.41:1).
About this color
#257387 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 52%, its chroma 0.080 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.023 away. White text reads best on it, at 5.41:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.88:1 |
| White text | 5.41:1 |
Values
| HEX | #257387 |
| RGB | rgb(37, 115, 135) |
| HSL | hsl(192, 57%, 34%) |
| OKLCH | oklch(51.8% 0.08 218.5) |
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 #257387 | 5.41:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #257387 | 3.88:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #257387 text on white | 5.41:1 | AA | Lc 76.7 | Fine for body text |
| #257387 text on black | 3.88:1 | AA large text | Lc -25.1 | 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 700.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECEF
oklch(93.6% 0.011 217.5)
-
Step 200
200
#CADDE3
oklch(88.5% 0.022 218.6)
-
Step 300
300
#A6C7D1
oklch(80.9% 0.038 218.1)
-
Step 400
400
#74AABB
oklch(70.6% 0.062 219.6)
-
Step 500
500
#4C95AA
oklch(63.1% 0.079 219)
-
Step 600
600
#2A7F95
oklch(55.6% 0.086 218.6)
-
Step 700
700 (this color)
#257387
oklch(51.8% 0.08 218.5)
-
Step 800
800
#1A5767
oklch(42.6% 0.066 218.9)
-
Step 900
900
#1D4854
oklch(37.7% 0.051 218.9)
-
Step 950
950
#122A31
oklch(26.9% 0.033 219.1)
#257387 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) | #667088 | 0.068 |
| Deuteranopia (no green cones) | #596687 | 0.061 |
| Tritanopia (no blue cones) | #007A79 | 0.038 |
| Achromatopsia (no color) | #6A6A6A | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #257387
#257387
oklch(51.8% 0.08 218.5)
- #905846
#905846
oklch(51.9% 0.08 38.6)
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 #257387, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.023
- Deep Aqua #08787F ΔE 0.025
- Ocean #017B92 ΔE 0.026
- Deep Turquoise #017374 ΔE 0.036
- Ocean Blue #03719C ΔE 0.037
- Bluegreen #017A79 ΔE 0.038
- Dark Aquamarine #017371 ΔE 0.040
- Metallic Blue #4F738E ΔE 0.041
Use #257387 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.