#374E7F
Closest named color: Dusk Blue (#26538D). oklch(42.9% 0.086 264.1), rgb(55, 78, 127).
Aa
White text reads best on this color (8.20:1).
About this color
#374E7F is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.086 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.028 away. White text reads best on it, at 8.20:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.55:1 |
| White text | 8.20:1 |
Values
| HEX | #374E7F |
| RGB | rgb(55, 78, 127) |
| HSL | hsl(221, 40%, 36%) |
| OKLCH | oklch(42.9% 0.086 264.1) |
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 #374E7F | 8.20:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #374E7F | 2.55:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #374E7F text on white | 8.20:1 | AAA | Lc 88.2 | Fine for body text |
| #374E7F 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
#87A0D4
oklch(70.6% 0.082 264.5)
-
Step 500
500
#6988C8
oklch(63% 0.103 263.9)
-
Step 600
600
#5171B5
oklch(55.6% 0.113 264)
-
Step 700
700
#425E9C
oklch(49% 0.105 264.5)
-
Step 800
800 (this color)
#374E7F
oklch(42.9% 0.086 264.1)
-
Step 900
900
#2F4165
oklch(37.8% 0.066 263.3)
-
Step 950
950
#1C263B
oklch(27% 0.042 264.3)
#374E7F 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) | #3A5281 | 0.013 |
| Deuteranopia (no green cones) | #314C7E | 0.010 |
| Tritanopia (no blue cones) | #0D5960 | 0.078 |
| Achromatopsia (no color) | #4F4F4F | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E7F
#374E7F
oklch(42.9% 0.086 264.1)
- #664B03
#664B03
oklch(43% 0.087 84.3)
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 #374E7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.028
- Light Navy #155084 ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.038
- Dusk #4E5481 ΔE 0.039
- Twilight #4E518B ΔE 0.040
- Cobalt #1E488F ΔE 0.044
- YInMn Blue #415A77 ΔE 0.045
Use #374E7F 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.