#374F8E
Closest named color: Dusk Blue (#26538D). oklch(44.1% 0.108 266.4), rgb(55, 79, 142).
Aa
White text reads best on this color (7.86:1).
About this color
#374F8E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.108 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.020 away. White text reads best on it, at 7.86:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.67:1 |
| White text | 7.86:1 |
Values
| HEX | #374F8E |
| RGB | rgb(55, 79, 142) |
| HSL | hsl(223, 44%, 39%) |
| OKLCH | oklch(44.1% 0.108 266.4) |
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 #374F8E | 7.86:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #374F8E | 2.67:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #374F8E text on white | 7.86:1 | AAA | Lc 87.1 | Fine for body text |
| #374F8E text on black | 2.67:1 | Fails | Lc -15.0 | 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
#CED9F1
oklch(88.4% 0.035 266)
-
Step 300
300
#AEC0EA
oklch(80.8% 0.063 266.8)
-
Step 400
400
#839FE0
oklch(70.7% 0.101 266)
-
Step 500
500
#6586D7
oklch(63.1% 0.128 266.1)
-
Step 600
600
#4D6EC5
oklch(55.7% 0.14 266.3)
-
Step 700
700
#3E5BAA
oklch(49% 0.131 266.5)
-
Step 800
800 (this color)
#374F8E
oklch(44.1% 0.108 266.4)
-
Step 900
900
#2D3F6E
oklch(37.7% 0.084 266.6)
-
Step 950
950
#1A2540
oklch(26.9% 0.053 266.2)
#374F8E 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) | #335690 | 0.020 |
| Deuteranopia (no green cones) | #264E8D | 0.019 |
| Tritanopia (no blue cones) | #005D67 | 0.094 |
| Achromatopsia (no color) | #525252 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F8E
#374F8E
oklch(44.1% 0.108 266.4)
- #694E00
#694E00
oklch(44.1% 0.09 85.6)
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 #374F8E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.020
- Twilight #4E518B ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.035
- Cobalt #1E488F ΔE 0.035
- Light Navy Blue #2E5A88 ΔE 0.036
- Light Navy #155084 ΔE 0.036
- Dusk #4E5481 ΔE 0.043
- Blueberry #464196 ΔE 0.044
Use #374F8E 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.