#374E6F
Closest named color: YInMn Blue (#415A77). oklch(42% 0.062 257.4), rgb(55, 78, 111).
Aa
White text reads best on this color (8.46:1).
About this color
#374E6F is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.062 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.040 away. White text reads best on it, at 8.46:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.48:1 |
| White text | 8.46:1 |
Values
| HEX | #374E6F |
| RGB | rgb(55, 78, 111) |
| HSL | hsl(215, 34%, 33%) |
| OKLCH | oklch(42% 0.062 257.4) |
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 #374E6F | 8.46:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #374E6F | 2.48:1 | Fails | Lc 14.9 | Not readable |
| #374E6F text on white | 8.46:1 | AAA | Lc 89.1 | Fine for body text |
| #374E6F text on black | 2.48:1 | Fails | Lc -13.1 | 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
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B2C2D9
oklch(80.9% 0.037 257.4)
-
Step 400
400
#8AA2C5
oklch(70.6% 0.058 257.7)
-
Step 500
500
#6D8BB7
oklch(63.1% 0.075 257.8)
-
Step 600
600
#5575A3
oklch(55.7% 0.081 257.4)
-
Step 700
700
#45628B
oklch(49.2% 0.075 257.1)
-
Step 800
800 (this color)
#374E6F
oklch(42% 0.062 257.4)
-
Step 900
900
#31425B
oklch(37.6% 0.048 257.9)
-
Step 950
950
#1D2736
oklch(27% 0.031 258.3)
#374E6F 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) | #415070 | 0.016 |
| Deuteranopia (no green cones) | #3B4B6E | 0.010 |
| Tritanopia (no blue cones) | #1F555A | 0.054 |
| Achromatopsia (no color) | #4D4D4D | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E6F
#374E6F
oklch(42% 0.062 257.4)
- #604923
#604923
oklch(42.1% 0.062 78.3)
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 #374E6F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.040
- Light Navy #155084 ΔE 0.044
- Dark Grey Blue #29465B ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.048
- Dusk #4E5481 ΔE 0.048
- Dusk Blue #26538D ΔE 0.050
- Dusty Grape #545775 ΔE 0.053
Use #374E6F 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.