#374477
Closest named color: Twilight Blue (#0A437A). oklch(40.1% 0.088 271.2), rgb(55, 68, 119).
Aa
White text reads best on this color (9.30:1).
About this color
#374477 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.088 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 9.30:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #374477 |
| RGB | rgb(55, 68, 119) |
| HSL | hsl(228, 37%, 34%) |
| OKLCH | oklch(40.1% 0.088 271.2) |
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 #374477 | 9.30:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #374477 | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #374477 text on white | 9.30:1 | AAA | Lc 91.4 | Preferred for body text |
| #374477 text on black | 2.25:1 | Fails | Lc -11.0 | 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 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B1BFEC
oklch(80.9% 0.066 271.4)
-
Step 400
400
#899DE2
oklch(70.8% 0.104 271.2)
-
Step 500
500
#6C83DA
oklch(63.1% 0.134 271)
-
Step 600
600
#556BC8
oklch(55.7% 0.146 271)
-
Step 700
700
#4658AD
oklch(49.1% 0.136 271.5)
-
Step 800
800
#39498C
oklch(42.8% 0.112 270.9)
-
Step 900
900 (this color)
#374477
oklch(40.1% 0.088 271.2)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#374477 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) | #2F4A79 | 0.019 |
| Deuteranopia (no green cones) | #294476 | 0.018 |
| Tritanopia (no blue cones) | #1A4F57 | 0.079 |
| Achromatopsia (no color) | #474747 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374477
#374477
oklch(40.1% 0.088 271.2)
- #584600
#584600
oklch(40.2% 0.082 92)
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 #374477, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Light Navy #155084 ΔE 0.045
- Cobalt #1E488F ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.048
- Dusk Blue #26538D ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.056
- Blueberry #464196 ΔE 0.058
Use #374477 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.