#255B78
Closest named color: YInMn Blue (#415A77). oklch(44.8% 0.074 235.3), rgb(37, 91, 120).
Aa
White text reads best on this color (7.37:1).
About this color
#255B78 is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.074 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.029 away. White text reads best on it, at 7.37:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.84:1 |
| White text | 7.37:1 |
Values
| HEX | #255B78 |
| RGB | rgb(37, 91, 120) |
| HSL | hsl(201, 53%, 31%) |
| OKLCH | oklch(44.8% 0.074 235.3) |
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 #255B78 | 7.37:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #255B78 | 2.84:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #255B78 text on white | 7.37:1 | AAA | Lc 85.4 | Fine for body text |
| #255B78 text on black | 2.84:1 | Fails | Lc -16.6 | 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 800.
-
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
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A7C6D9
oklch(81% 0.043 235)
-
Step 400
400
#76A8C6
oklch(70.7% 0.069 235.4)
-
Step 500
500
#5092B7
oklch(63.1% 0.088 235)
-
Step 600
600
#307CA3
oklch(55.7% 0.095 234.7)
-
Step 700
700
#21688C
oklch(49.1% 0.089 235.2)
-
Step 800
800 (this color)
#255B78
oklch(44.8% 0.074 235.3)
-
Step 900
900
#1F465C
oklch(37.6% 0.058 235.9)
-
Step 950
950
#132936
oklch(26.9% 0.037 236.3)
#255B78 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) | #4D5A79 | 0.045 |
| Deuteranopia (no green cones) | #425278 | 0.039 |
| Tritanopia (no blue cones) | #006365 | 0.050 |
| Achromatopsia (no color) | #565656 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #255B78
#255B78
oklch(44.8% 0.074 235.3)
- #74492A
#74492A
oklch(44.8% 0.074 55.3)
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 #255B78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.030
- Petrol #005F6A ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.037
- Denim #3B638C ΔE 0.046
- Light Navy #155084 ΔE 0.046
- Dusk Blue #26538D ΔE 0.047
- Denim Blue #3B5B92 ΔE 0.050
Use #255B78 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.