#374E78
Closest named color: Light Navy (#155084). oklch(42.5% 0.076 261.8), rgb(55, 78, 120).
Aa
White text reads best on this color (8.32:1).
About this color
#374E78 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.076 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.034 away. White text reads best on it, at 8.32:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.52:1 |
| White text | 8.32:1 |
Values
| HEX | #374E78 |
| RGB | rgb(55, 78, 120) |
| HSL | hsl(219, 37%, 34%) |
| OKLCH | oklch(42.5% 0.076 261.8) |
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 #374E78 | 8.32:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #374E78 | 2.52:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #374E78 text on white | 8.32:1 | AAA | Lc 88.6 | Fine for body text |
| #374E78 text on black | 2.52:1 | Fails | Lc -13.6 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B1C1DE
oklch(80.8% 0.045 262.4)
-
Step 400
400
#88A1CD
oklch(70.6% 0.071 261.6)
-
Step 500
500
#6B8AC1
oklch(63.2% 0.091 261.5)
-
Step 600
600
#5373AD
oklch(55.7% 0.098 261.7)
-
Step 700
700
#436095
oklch(49.1% 0.092 261.7)
-
Step 800
800 (this color)
#374E78
oklch(42.5% 0.076 261.8)
-
Step 900
900
#304161
oklch(37.6% 0.059 262.4)
-
Step 950
950
#1C2639
oklch(26.9% 0.038 262.7)
#374E78 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) | #3E517A | 0.014 |
| Deuteranopia (no green cones) | #364B77 | 0.009 |
| Tritanopia (no blue cones) | #17575D | 0.068 |
| Achromatopsia (no color) | #4E4E4E | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E78
#374E78
oklch(42.5% 0.076 261.8)
- #634A15
#634A15
oklch(42.5% 0.076 82.4)
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 #374E78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.034
- Dusk Blue #26538D ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.040
- Dusk #4E5481 ΔE 0.041
- YInMn Blue #415A77 ΔE 0.041
- Twilight #4E518B ΔE 0.047
- Cobalt #1E488F ΔE 0.052
Use #374E78 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.