#374588
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.112 271.8), rgb(55, 69, 136).
Aa
White text reads best on this color (8.86:1).
About this color
#374588 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.112 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 8.86:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.36:1 |
| White text | 8.86:1 |
Values
| HEX | #374588 |
| RGB | rgb(55, 69, 136) |
| HSL | hsl(230, 42%, 37%) |
| OKLCH | oklch(41.5% 0.112 271.8) |
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 #374588 | 8.86:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #374588 | 2.36:1 | Fails | Lc 13.9 | Not readable |
| #374588 text on white | 8.86:1 | AAA | Lc 90.1 | Preferred for body text |
| #374588 text on black | 2.36:1 | Fails | Lc -12.2 | 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
#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
#899CE2
oklch(70.6% 0.105 271.9)
-
Step 500
500
#6D82DA
oklch(63% 0.135 271.9)
-
Step 600
600
#566AC8
oklch(55.6% 0.147 271.8)
-
Step 700
700
#4758AD
oklch(49.1% 0.136 272)
-
Step 800
800 (this color)
#374588
oklch(41.5% 0.112 271.8)
-
Step 900
900
#323D70
oklch(37.7% 0.088 272.4)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#374588 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) | #244E8A | 0.030 |
| Deuteranopia (no green cones) | #184787 | 0.032 |
| Tritanopia (no blue cones) | #005460 | 0.099 |
| Achromatopsia (no color) | #4A4A4A | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374588
#374588
oklch(41.5% 0.112 271.8)
- #5C4900
#5C4900
oklch(41.3% 0.085 91.7)
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 #374588, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.034
- Dusk Blue #26538D ΔE 0.040
- Light Navy #155084 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.050
- Twilight #4E518B ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.056
Use #374588 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.