#374A8C
Closest named color: Cobalt (#1E488F). oklch(42.9% 0.111 269.2), rgb(55, 74, 140).
Aa
White text reads best on this color (8.33:1).
About this color
#374A8C is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.111 and its hue 269°. 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 8.33:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.52:1 |
| White text | 8.33:1 |
Values
| HEX | #374A8C |
| RGB | rgb(55, 74, 140) |
| HSL | hsl(227, 44%, 38%) |
| OKLCH | oklch(42.9% 0.111 269.2) |
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 #374A8C | 8.33:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #374A8C | 2.52:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #374A8C text on white | 8.33:1 | AAA | Lc 88.5 | Fine for body text |
| #374A8C text on black | 2.52:1 | Fails | Lc -13.6 | 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
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#CFD9F2
oklch(88.5% 0.036 268.3)
-
Step 300
300
#AFC0EC
oklch(81% 0.065 268.4)
-
Step 400
400
#869EE2
oklch(70.8% 0.104 268.8)
-
Step 500
500
#6984DA
oklch(63.1% 0.133 269.2)
-
Step 600
600
#516CC7
oklch(55.6% 0.144 268.9)
-
Step 700
700
#4259AC
oklch(49% 0.135 269.3)
-
Step 800
800 (this color)
#374A8C
oklch(42.9% 0.111 269.2)
-
Step 900
900
#2F3E6F
oklch(37.7% 0.086 269.2)
-
Step 950
950
#1C2541
oklch(27.1% 0.054 269.1)
#374A8C 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) | #2B528E | 0.024 |
| Deuteranopia (no green cones) | #1E4A8B | 0.026 |
| Tritanopia (no blue cones) | #005964 | 0.098 |
| Achromatopsia (no color) | #4E4E4E | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A8C
#374A8C
oklch(42.9% 0.111 269.2)
- #634C00
#634C00
oklch(42.9% 0.088 88.6)
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 #374A8C, 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 0.029
- Blueberry #464196 ΔE 0.036
- Light Navy #155084 ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.040
- Twilight #4E518B ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.048
- Denim Blue #3B5B92 ΔE 0.049
Use #374A8C 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.