#374E7E
Closest named color: Dusk Blue (#26538D). oklch(42.9% 0.085 263.8), rgb(55, 78, 126).
Aa
White text reads best on this color (8.22:1).
About this color
#374E7E is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.085 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.029 away. White text reads best on it, at 8.22:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #374E7E |
| RGB | rgb(55, 78, 126) |
| HSL | hsl(221, 39%, 35%) |
| OKLCH | oklch(42.9% 0.085 263.8) |
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 #374E7E | 8.22:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #374E7E | 2.55:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #374E7E text on white | 8.22:1 | AAA | Lc 88.3 | Fine for body text |
| #374E7E text on black | 2.55:1 | Fails | Lc -13.9 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9EC
oklch(88.4% 0.028 265.4)
-
Step 300
300
#B0C1E2
oklch(80.9% 0.05 263.7)
-
Step 400
400
#87A1D3
oklch(70.8% 0.079 263.2)
-
Step 500
500
#6A88C7
oklch(63% 0.102 264.2)
-
Step 600
600
#5171B4
oklch(55.5% 0.111 263.8)
-
Step 700
700
#425F9B
oklch(49.2% 0.103 263.6)
-
Step 800
800 (this color)
#374E7E
oklch(42.9% 0.085 263.8)
-
Step 900
900
#2F4165
oklch(37.8% 0.066 263.3)
-
Step 950
950
#1C263B
oklch(27% 0.042 264.3)
#374E7E 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) | #3B5280 | 0.014 |
| Deuteranopia (no green cones) | #324C7D | 0.009 |
| Tritanopia (no blue cones) | #0F5860 | 0.075 |
| Achromatopsia (no color) | #4F4F4F | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E7E
#374E7E
oklch(42.9% 0.085 263.8)
- #654B06
#654B06
oklch(42.9% 0.085 84.8)
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 #374E7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.029
- Light Navy #155084 ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.038
- Dusk #4E5481 ΔE 0.039
- Twilight #4E518B ΔE 0.041
- YInMn Blue #415A77 ΔE 0.044
- Cobalt #1E488F ΔE 0.045
Use #374E7E 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.