#155378
Closest named color: Deep Sea Blue (#015482). oklch(42.3% 0.086 240.3), rgb(21, 83, 120).
Aa
White text reads best on this color (8.26:1).
About this color
#155378 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.086 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.017 away. White text reads best on it, at 8.26:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.54:1 |
| White text | 8.26:1 |
Values
| HEX | #155378 |
| RGB | rgb(21, 83, 120) |
| HSL | hsl(202, 70%, 28%) |
| OKLCH | oklch(42.3% 0.086 240.3) |
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 #155378 | 8.26:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #155378 | 2.54:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #155378 text on white | 8.26:1 | AAA | Lc 88.2 | Fine for body text |
| #155378 text on black | 2.54:1 | Fails | Lc -14.0 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#C9DCEA
oklch(88.5% 0.028 239.7)
-
Step 300
300
#A4C6DE
oklch(81% 0.05 239)
-
Step 400
400
#71A8CE
oklch(70.8% 0.08 239.5)
-
Step 500
500
#4891C2
oklch(63.1% 0.104 240.5)
-
Step 600
600
#257BAE
oklch(55.7% 0.112 239.9)
-
Step 700
700
#166796
oklch(49.1% 0.105 240.6)
-
Step 800
800 (this color)
#155378
oklch(42.3% 0.086 240.3)
-
Step 900
900
#1B4662
oklch(37.8% 0.067 240.5)
-
Step 950
950
#112939
oklch(27% 0.042 240.1)
#155378 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) | #42537A | 0.045 |
| Deuteranopia (no green cones) | #344A77 | 0.035 |
| Tritanopia (no blue cones) | #005C60 | 0.057 |
| Achromatopsia (no color) | #4E4E4E | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #155378
#155378
oklch(42.3% 0.086 240.3)
- #6F4114
#6F4114
oklch(42.2% 0.086 60.5)
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 #155378, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.017
- Light Navy #155084 ΔE 0.024
- Dusk Blue #26538D ΔE 0.039
- Light Navy Blue #2E5A88 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.050
- Petrol #005F6A ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Cobalt #1E488F ΔE 0.055
Use #155378 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.