#374F83
Closest named color: Dusk Blue (#26538D). oklch(43.4% 0.091 264.2), rgb(55, 79, 131).
Aa
White text reads best on this color (8.05:1).
About this color
#374F83 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.091 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.023 away. White text reads best on it, at 8.05:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.60:1 |
| White text | 8.05:1 |
Values
| HEX | #374F83 |
| RGB | rgb(55, 79, 131) |
| HSL | hsl(221, 41%, 36%) |
| OKLCH | oklch(43.4% 0.091 264.2) |
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 #374F83 | 8.05:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #374F83 | 2.60:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #374F83 text on white | 8.05:1 | AAA | Lc 87.7 | Fine for body text |
| #374F83 text on black | 2.60:1 | Fails | Lc -14.4 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9ED
oklch(88.4% 0.03 264.4)
-
Step 300
300
#AFC1E4
oklch(80.9% 0.053 263.7)
-
Step 400
400
#86A0D7
oklch(70.7% 0.086 264.7)
-
Step 500
500
#6888CC
oklch(63.2% 0.109 264.3)
-
Step 600
600
#5071B8
oklch(55.7% 0.117 264.1)
-
Step 700
700
#405E9F
oklch(49.1% 0.11 264.1)
-
Step 800
800 (this color)
#374F83
oklch(43.4% 0.091 264.2)
-
Step 900
900
#2E4067
oklch(37.6% 0.071 264.4)
-
Step 950
950
#1B263D
oklch(27% 0.046 264.1)
#374F83 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) | #3A5485 | 0.016 |
| Deuteranopia (no green cones) | #304D82 | 0.011 |
| Tritanopia (no blue cones) | #055A62 | 0.082 |
| Achromatopsia (no color) | #505050 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F83
#374F83
oklch(43.4% 0.091 264.2)
- #684C00
#684C00
oklch(43.5% 0.089 84.2)
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 #374F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.023
- Light Navy #155084 ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.032
- Twilight #4E518B ΔE 0.036
- Dusk #4E5481 ΔE 0.037
- Deep Sea Blue #015482 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.040
- Cobalt #1E488F ΔE 0.042
Use #374F83 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.