#374F78
Closest named color: Light Navy (#155084). oklch(42.8% 0.075 260.7), rgb(55, 79, 120).
Aa
White text reads best on this color (8.22:1).
About this color
#374F78 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.075 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Light Navy (#155084), ΔE 0.035 away. White text reads best on it, at 8.22:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Light Navy (#155084) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #374F78 |
| RGB | rgb(55, 79, 120) |
| HSL | hsl(218, 37%, 34%) |
| OKLCH | oklch(42.8% 0.075 260.7) |
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 #374F78 | 8.22:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #374F78 | 2.55:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #374F78 text on white | 8.22:1 | AAA | Lc 88.3 | Fine for body text |
| #374F78 text on black | 2.55:1 | Fails | Lc -13.8 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
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
#B1C2DD
oklch(81% 0.043 259.6)
-
Step 400
400
#88A2CD
oklch(70.8% 0.07 260.4)
-
Step 500
500
#6A8AC0
oklch(63.1% 0.09 260.6)
-
Step 600
600
#5273AC
oklch(55.6% 0.097 260.9)
-
Step 700
700
#426094
oklch(49% 0.091 260.9)
-
Step 800
800 (this color)
#374F78
oklch(42.8% 0.075 260.7)
-
Step 900
900
#304261
oklch(37.8% 0.058 260.9)
-
Step 950
950
#1C2739
oklch(27.1% 0.037 260)
#374F78 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) | #3F527A | 0.015 |
| Deuteranopia (no green cones) | #374C77 | 0.009 |
| Tritanopia (no blue cones) | #17585E | 0.066 |
| Achromatopsia (no color) | #4F4F4F | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F78
#374F78
oklch(42.8% 0.075 260.7)
- #644A18
#644A18
oklch(42.7% 0.074 80.4)
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 #374F78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Navy #155084 ΔE 0.035
- Dusk Blue #26538D ΔE 0.037
- Light Navy Blue #2E5A88 ΔE 0.037
- YInMn Blue #415A77 ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.039
- Dusk #4E5481 ΔE 0.039
- Twilight #4E518B ΔE 0.047
- Dusty Grape #545775 ΔE 0.051
Use #374F78 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.