#374B89
Closest named color: Dusk Blue (#26538D). oklch(42.9% 0.106 268.3), rgb(55, 75, 137).
Aa
White text reads best on this color (8.30:1).
About this color
#374B89 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.106 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.026 away. White text reads best on it, at 8.30:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.53:1 |
| White text | 8.30:1 |
Values
| HEX | #374B89 |
| RGB | rgb(55, 75, 137) |
| HSL | hsl(225, 43%, 38%) |
| OKLCH | oklch(42.9% 0.106 268.3) |
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 #374B89 | 8.30:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #374B89 | 2.53:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #374B89 text on white | 8.30:1 | AAA | Lc 88.5 | Fine for body text |
| #374B89 text on black | 2.53:1 | Fails | Lc -13.7 | 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
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#B0C0E9
oklch(80.9% 0.061 268.3)
-
Step 400
400
#869EDF
oklch(70.6% 0.099 268.3)
-
Step 500
500
#6985D6
oklch(63.1% 0.126 268.2)
-
Step 600
600
#516DC3
oklch(55.6% 0.137 268.2)
-
Step 700
700
#425BA8
oklch(49.1% 0.127 268)
-
Step 800
800 (this color)
#374B89
oklch(42.9% 0.106 268.3)
-
Step 900
900
#2F3F6D
oklch(37.8% 0.082 267.9)
-
Step 950
950
#1C2540
oklch(27.1% 0.052 268.8)
#374B89 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) | #2F528B | 0.020 |
| Deuteranopia (no green cones) | #244B88 | 0.021 |
| Tritanopia (no blue cones) | #005963 | 0.094 |
| Achromatopsia (no color) | #4E4E4E | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374B89
#374B89
oklch(42.9% 0.106 268.3)
- #634C00
#634C00
oklch(42.9% 0.088 88.6)
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 #374B89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.026
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.034
- Twilight #4E518B ΔE 0.039
- Blueberry #464196 ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.043
- Light Navy Blue #2E5A88 ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.046
Use #374B89 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.