#255579
Closest named color: Deep Sea Blue (#015482). oklch(43.4% 0.079 243.8), rgb(37, 85, 121).
Aa
White text reads best on this color (7.91:1).
About this color
#255579 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.079 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.024 away. White text reads best on it, at 7.91:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #255579 |
| RGB | rgb(37, 85, 121) |
| HSL | hsl(206, 53%, 31%) |
| OKLCH | oklch(43.4% 0.079 243.8) |
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 #255579 | 7.91:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #255579 | 2.65:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #255579 text on white | 7.91:1 | AAA | Lc 87.2 | Fine for body text |
| #255579 text on black | 2.65:1 | Fails | Lc -14.9 | 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CBDBE9
oklch(88.4% 0.026 244.5)
-
Step 300
300
#A8C5DD
oklch(81% 0.046 243.3)
-
Step 400
400
#78A6CC
oklch(70.6% 0.075 244)
-
Step 500
500
#5490BF
oklch(63.2% 0.095 243.7)
-
Step 600
600
#3679AB
oklch(55.6% 0.103 243.9)
-
Step 700
700
#286693
oklch(49.2% 0.096 243.7)
-
Step 800
800 (this color)
#255579
oklch(43.4% 0.079 243.8)
-
Step 900
900
#224560
oklch(37.7% 0.062 243.8)
-
Step 950
950
#152838
oklch(26.9% 0.039 245.4)
#255579 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) | #45567B | 0.037 |
| Deuteranopia (no green cones) | #394E78 | 0.027 |
| Tritanopia (no blue cones) | #005E62 | 0.058 |
| Achromatopsia (no color) | #515151 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255579
#255579
oklch(43.4% 0.079 243.8)
- #6F461C
#6F461C
oklch(43.3% 0.08 63.3)
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 #255579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.029
- Light Navy #155084 ΔE 0.029
- Dusk Blue #26538D ΔE 0.035
- YInMn Blue #415A77 ΔE 0.036
- Petrol #005F6A ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.051
- Dusk #4E5481 ΔE 0.052
Use #255579 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.