#374F90
Closest named color: Dusk Blue (#26538D). oklch(44.2% 0.111 266.7), rgb(55, 79, 144).
Aa
White text reads best on this color (7.82:1).
About this color
#374F90 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.111 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.021 away. White text reads best on it, at 7.82:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.68:1 |
| White text | 7.82:1 |
Values
| HEX | #374F90 |
| RGB | rgb(55, 79, 144) |
| HSL | hsl(224, 45%, 39%) |
| OKLCH | oklch(44.2% 0.111 266.7) |
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 #374F90 | 7.82:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #374F90 | 2.68:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #374F90 text on white | 7.82:1 | AAA | Lc 87.0 | Fine for body text |
| #374F90 text on black | 2.68:1 | Fails | Lc -15.1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#AEC0EB
oklch(80.9% 0.064 267.2)
-
Step 400
400
#839FE2
oklch(70.8% 0.104 266.4)
-
Step 500
500
#6585D9
oklch(63.1% 0.132 266.9)
-
Step 600
600
#4D6DC7
oklch(55.6% 0.144 267)
-
Step 700
700
#3E5BAC
oklch(49.2% 0.134 266.7)
-
Step 800
800 (this color)
#374F90
oklch(44.2% 0.111 266.7)
-
Step 900
900
#2C3F6F
oklch(37.7% 0.086 266.1)
-
Step 950
950
#1A2541
oklch(27% 0.055 266.6)
#374F90 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) | #315692 | 0.020 |
| Deuteranopia (no green cones) | #244E8F | 0.021 |
| Tritanopia (no blue cones) | #005E68 | 0.097 |
| Achromatopsia (no color) | #525252 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F90
#374F90
oklch(44.2% 0.111 266.7)
- #694F00
#694F00
oklch(44.3% 0.091 86.7)
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 #374F90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.021
- Twilight #4E518B ΔE 0.034
- Cobalt #1E488F ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.035
- Light Navy Blue #2E5A88 ΔE 0.037
- Light Navy #155084 ΔE 0.038
- Blueberry #464196 ΔE 0.043
- Dusk #4E5481 ΔE 0.045
Use #374F90 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.