#374B7F
Closest named color: Dusk Blue (#26538D). oklch(42.2% 0.09 266.7), rgb(55, 75, 127).
Aa
White text reads best on this color (8.48:1).
About this color
#374B7F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.090 and its hue 267°. 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 8.48:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.47:1 |
| White text | 8.48:1 |
Values
| HEX | #374B7F |
| RGB | rgb(55, 75, 127) |
| HSL | hsl(223, 40%, 36%) |
| OKLCH | oklch(42.2% 0.09 266.7) |
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 #374B7F | 8.48:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #374B7F | 2.47:1 | Fails | Lc 14.9 | Not readable |
| #374B7F text on white | 8.48:1 | AAA | Lc 89.1 | Fine for body text |
| #374B7F text on black | 2.47:1 | Fails | Lc -13.1 | 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
#D0D9ED
oklch(88.5% 0.029 266.4)
-
Step 300
300
#B1C0E4
oklch(80.8% 0.054 267.4)
-
Step 400
400
#899FD6
oklch(70.6% 0.085 267.4)
-
Step 500
500
#6C87CB
oklch(63.1% 0.108 266.9)
-
Step 600
600
#5470B8
oklch(55.7% 0.117 266.6)
-
Step 700
700
#445D9E
oklch(49% 0.109 266.6)
-
Step 800
800 (this color)
#374B7F
oklch(42.2% 0.09 266.7)
-
Step 900
900
#304067
oklch(37.7% 0.07 266.2)
-
Step 950
950
#1C263C
oklch(27.1% 0.044 265)
#374B7F 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) | #365081 | 0.014 |
| Deuteranopia (no green cones) | #2D4A7E | 0.013 |
| Tritanopia (no blue cones) | #0F565F | 0.080 |
| Achromatopsia (no color) | #4D4D4D | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374B7F
#374B7F
oklch(42.2% 0.09 266.7)
- #624A00
#624A00
oklch(42.3% 0.086 87.2)
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 #374B7F, 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 0.032
- Cobalt #1E488F ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.042
- Twilight #4E518B ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.043
- Dusk #4E5481 ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.050
Use #374B7F 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.