#255371
Closest named color: Deep Sea Blue (#015482). oklch(42.4% 0.071 240), rgb(37, 83, 113).
Aa
White text reads best on this color (8.22:1).
About this color
#255371 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.071 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.032 away. White text reads best on it, at 8.22:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #255371 |
| RGB | rgb(37, 83, 113) |
| HSL | hsl(204, 51%, 29%) |
| OKLCH | oklch(42.4% 0.071 240) |
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 #255371 | 8.22:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #255371 | 2.55:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #255371 text on white | 8.22:1 | AAA | Lc 88.2 | Fine for body text |
| #255371 text on black | 2.55:1 | Fails | Lc -13.9 | Not readable |
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 800.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDCE7
oklch(88.6% 0.023 237.7)
-
Step 300
300
#A9C5D9
oklch(80.9% 0.041 239.1)
-
Step 400
400
#7BA7C6
oklch(70.8% 0.066 239.6)
-
Step 500
500
#5790B8
oklch(63% 0.085 240.6)
-
Step 600
600
#3A7AA4
oklch(55.6% 0.093 240.1)
-
Step 700
700
#2C678C
oklch(49.2% 0.085 239.4)
-
Step 800
800 (this color)
#255371
oklch(42.4% 0.071 240)
-
Step 900
900
#24455C
oklch(37.6% 0.055 240.8)
-
Step 950
950
#162936
oklch(27.1% 0.035 239.7)
#255371 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) | #455372 | 0.037 |
| Deuteranopia (no green cones) | #3B4B70 | 0.032 |
| Tritanopia (no blue cones) | #005B5D | 0.052 |
| Achromatopsia (no color) | #4F4F4F | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255371
#255371
oklch(42.4% 0.071 240)
- #6A4423
#6A4423
oklch(42.3% 0.071 60)
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 #255371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.032
- Light Navy #155084 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.042
- Petrol #005F6A ΔE 0.045
- Dusk Blue #26538D ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.048
- Deep Teal #00555A ΔE 0.048
Use #255371 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.