#374A90
Closest named color: Cobalt (#1E488F). oklch(43.2% 0.117 269.5), rgb(55, 74, 144).
Aa
White text reads best on this color (8.25:1).
About this color
#374A90 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.117 and its hue 270°. 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 8.25:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.54:1 |
| White text | 8.25:1 |
Values
| HEX | #374A90 |
| RGB | rgb(55, 74, 144) |
| HSL | hsl(227, 45%, 39%) |
| OKLCH | oklch(43.2% 0.117 269.5) |
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 #374A90 | 8.25:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #374A90 | 2.54:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #374A90 text on white | 8.25:1 | AAA | Lc 88.3 | Fine for body text |
| #374A90 text on black | 2.54:1 | Fails | Lc -13.9 | 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
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#AFBFEE
oklch(80.9% 0.069 270.1)
-
Step 400
400
#859DE5
oklch(70.6% 0.109 269.4)
-
Step 500
500
#6883DE
oklch(63.1% 0.14 269.6)
-
Step 600
600
#506BCC
oklch(55.7% 0.153 269.3)
-
Step 700
700
#4158B0
oklch(49% 0.142 269.5)
-
Step 800
800 (this color)
#374A90
oklch(43.2% 0.117 269.5)
-
Step 900
900
#2E3D72
oklch(37.6% 0.093 269.6)
-
Step 950
950
#1B2443
oklch(26.9% 0.059 269.9)
#374A90 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) | #285393 | 0.027 |
| Deuteranopia (no green cones) | #184B8F | 0.030 |
| Tritanopia (no blue cones) | #005A66 | 0.102 |
| Achromatopsia (no color) | #4F4F4F | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A90
#374A90
oklch(43.2% 0.117 269.5)
- #634D00
#634D00
oklch(43.1% 0.088 89.7)
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 #374A90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Dusk Blue #26538D ΔE 0.030
- Blueberry #464196 ΔE 0.032
- Dark Slate Blue #483D8B ΔE 0.039
- Light Navy #155084 ΔE 0.041
- Twilight #4E518B ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.050
Use #374A90 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.