#374E9D
Closest named color: Dusk Blue (#26538D). oklch(44.9% 0.131 268.5), rgb(55, 78, 157).
Aa
White text reads best on this color (7.66:1).
About this color
#374E9D is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.131 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.036 away. White text reads best on it, at 7.66:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.66:1 |
Values
| HEX | #374E9D |
| RGB | rgb(55, 78, 157) |
| HSL | hsl(226, 48%, 42%) |
| OKLCH | oklch(44.9% 0.131 268.5) |
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 #374E9D | 7.66:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #374E9D | 2.73:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #374E9D text on white | 7.66:1 | AAA | Lc 86.4 | Fine for body text |
| #374E9D text on black | 2.73:1 | Fails | Lc -15.7 | Dividers and decoration only |
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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#809DED
oklch(70.7% 0.122 268.1)
-
Step 500
500
#6282E7
oklch(63.1% 0.156 268.4)
-
Step 600
600
#4A69D6
oklch(55.6% 0.171 268.4)
-
Step 700
700
#3C57B9
oklch(49.2% 0.158 268.4)
-
Step 800
800 (this color)
#374E9D
oklch(44.9% 0.131 268.5)
-
Step 900
900
#2B3D77
oklch(37.7% 0.101 268.3)
-
Step 950
950
#192446
oklch(27% 0.065 268.3)
#374E9D 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) | #2358A0 | 0.030 |
| Deuteranopia (no green cones) | #094F9B | 0.035 |
| Tritanopia (no blue cones) | #00606E | 0.110 |
| Achromatopsia (no color) | #535353 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E9D
#374E9D
oklch(44.9% 0.131 268.5)
- #6A5100
#6A5100
oklch(44.9% 0.092 88)
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 #374E9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.036
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.044
- Twilight #4E518B ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.053
- Light Navy #155084 ΔE 0.054
Use #374E9D 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.