#374F74
Closest named color: YInMn Blue (#415A77). oklch(42.5% 0.069 258.8), rgb(55, 79, 116).
Aa
White text reads best on this color (8.29:1).
About this color
#374F74 is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.069 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.037 away. White text reads best on it, at 8.29:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #374F74 |
| RGB | rgb(55, 79, 116) |
| HSL | hsl(216, 36%, 34%) |
| OKLCH | oklch(42.5% 0.069 258.8) |
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 #374F74 | 8.29:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #374F74 | 2.53:1 | Fails | Lc 15.5 | Dividers and decoration only |
| #374F74 text on white | 8.29:1 | AAA | Lc 88.5 | Fine for body text |
| #374F74 text on black | 2.53:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE8
oklch(88.5% 0.022 256.7)
-
Step 300
300
#B1C2DB
oklch(80.9% 0.04 257.9)
-
Step 400
400
#89A2C9
oklch(70.7% 0.064 259.2)
-
Step 500
500
#6B8BBB
oklch(63.2% 0.081 258.3)
-
Step 600
600
#5374A7
oklch(55.6% 0.089 258.9)
-
Step 700
700
#436190
oklch(49.1% 0.084 259.1)
-
Step 800
800 (this color)
#374F74
oklch(42.5% 0.069 258.8)
-
Step 900
900
#30425E
oklch(37.7% 0.054 259)
-
Step 950
950
#1C2737
oklch(27% 0.034 257.7)
#374F74 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) | #415176 | 0.016 |
| Deuteranopia (no green cones) | #394C73 | 0.009 |
| Tritanopia (no blue cones) | #1B575C | 0.061 |
| Achromatopsia (no color) | #4E4E4E | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F74
#374F74
oklch(42.5% 0.069 258.8)
- #634A1E
#634A1E
oklch(42.6% 0.069 79.1)
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 #374F74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.037
- Light Navy #155084 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.041
- Deep Sea Blue #015482 ΔE 0.041
- Dusk #4E5481 ΔE 0.042
- Dusk Blue #26538D ΔE 0.043
- Dusty Grape #545775 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.051
Use #374F74 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.