#374E90
Closest named color: Dusk Blue (#26538D). oklch(44% 0.112 267.3), rgb(55, 78, 144).
Aa
White text reads best on this color (7.90:1).
About this color
#374E90 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.112 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.022 away. White text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #374E90 |
| RGB | rgb(55, 78, 144) |
| HSL | hsl(224, 45%, 39%) |
| OKLCH | oklch(44% 0.112 267.3) |
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 #374E90 | 7.90:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #374E90 | 2.65:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #374E90 text on white | 7.90:1 | AAA | Lc 87.2 | Fine for body text |
| #374E90 text on black | 2.65:1 | Fails | Lc -14.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#AEC0EC
oklch(80.9% 0.066 267.5)
-
Step 400
400
#839EE2
oklch(70.6% 0.105 267.1)
-
Step 500
500
#6585DA
oklch(63.1% 0.133 267)
-
Step 600
600
#4D6DC8
oklch(55.6% 0.146 267)
-
Step 700
700
#3F5AAD
oklch(49.1% 0.136 267.6)
-
Step 800
800 (this color)
#374E90
oklch(44% 0.112 267.3)
-
Step 900
900
#2D3F70
oklch(37.8% 0.087 267)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#374E90 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) | #2F5692 | 0.023 |
| Deuteranopia (no green cones) | #224D8F | 0.023 |
| Tritanopia (no blue cones) | #005D68 | 0.097 |
| Achromatopsia (no color) | #515151 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E90
#374E90
oklch(44% 0.112 267.3)
- #684F00
#684F00
oklch(44.2% 0.09 87.5)
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 #374E90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.022
- Cobalt #1E488F ΔE 0.033
- Twilight #4E518B ΔE 0.035
- Light Navy #155084 ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.040
- Blueberry #464196 ΔE 0.040
- Dusk #4E5481 ΔE 0.046
Use #374E90 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.