#374A81
Closest named color: Dusk Blue (#26538D). oklch(42.1% 0.095 267.8), rgb(55, 74, 129).
Aa
White text reads best on this color (8.54:1).
About this color
#374A81 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.095 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.032 away. White text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #374A81 |
| RGB | rgb(55, 74, 129) |
| HSL | hsl(225, 40%, 36%) |
| OKLCH | oklch(42.1% 0.095 267.8) |
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 #374A81 | 8.54:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #374A81 | 2.45:1 | Fails | Lc 14.8 | Not readable |
| #374A81 text on white | 8.54:1 | AAA | Lc 89.2 | Fine for body text |
| #374A81 text on black | 2.45:1 | Fails | Lc -13.0 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B1C0E5
oklch(80.9% 0.055 267.8)
-
Step 400
400
#899FD9
oklch(70.8% 0.089 268.1)
-
Step 500
500
#6C86CE
oklch(63.1% 0.113 268)
-
Step 600
600
#546FBB
oklch(55.7% 0.122 267.6)
-
Step 700
700
#455CA1
oklch(49.1% 0.114 268.1)
-
Step 800
800 (this color)
#374A81
oklch(42.1% 0.095 267.8)
-
Step 900
900
#313F69
oklch(37.7% 0.074 268.7)
-
Step 950
950
#1C253D
oklch(26.9% 0.047 267.6)
#374A81 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) | #335083 | 0.017 |
| Deuteranopia (no green cones) | #2A4980 | 0.016 |
| Tritanopia (no blue cones) | #0B565F | 0.085 |
| Achromatopsia (no color) | #4C4C4C | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A81
#374A81
oklch(42.1% 0.095 267.8)
- #614A00
#614A00
oklch(42.2% 0.086 88.1)
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 #374A81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.032
- Light Navy #155084 ΔE 0.033
- Cobalt #1E488F ΔE 0.036
- Twilight #4E518B ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.044
- Light Navy Blue #2E5A88 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.046
- Dusk #4E5481 ΔE 0.047
Use #374A81 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.