#374E6B
Closest named color: Dark Grey Blue (#29465B). oklch(41.8% 0.056 254.6), rgb(55, 78, 107).
Aa
White text reads best on this color (8.52:1).
About this color
#374E6B is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.056 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.040 away. White text reads best on it, at 8.52:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #374E6B |
| RGB | rgb(55, 78, 107) |
| HSL | hsl(213, 32%, 32%) |
| OKLCH | oklch(41.8% 0.056 254.6) |
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 #374E6B | 8.52:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #374E6B | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #374E6B text on white | 8.52:1 | AAA | Lc 89.3 | Fine for body text |
| #374E6B text on black | 2.46:1 | Fails | Lc -13.0 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D1DAE5
oklch(88.5% 0.018 253.4)
-
Step 300
300
#B3C2D6
oklch(80.9% 0.033 255.6)
-
Step 400
400
#8BA3C2
oklch(70.8% 0.053 255)
-
Step 500
500
#6E8CB2
oklch(63.2% 0.067 254.6)
-
Step 600
600
#55759E
oklch(55.5% 0.074 255)
-
Step 700
700
#466287
oklch(49% 0.068 255.7)
-
Step 800
800 (this color)
#374E6B
oklch(41.8% 0.056 254.6)
-
Step 900
900
#314359
oklch(37.7% 0.044 253.8)
-
Step 950
950
#1D2734
oklch(26.9% 0.028 255.2)
#374E6B 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) | #434F6C | 0.017 |
| Deuteranopia (no green cones) | #3D4A6A | 0.014 |
| Tritanopia (no blue cones) | #225458 | 0.049 |
| Achromatopsia (no color) | #4C4C4C | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E6B
#374E6B
oklch(41.8% 0.056 254.6)
- #5F4828
#5F4828
oklch(41.8% 0.056 74.3)
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 #374E6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.040
- YInMn Blue #415A77 ΔE 0.042
- Light Navy #155084 ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.049
- Charcoal #264653 ΔE 0.051
- Dark Slate Gray #2F4F4F ΔE 0.051
- Dusk #4E5481 ΔE 0.052
- Light Navy Blue #2E5A88 ΔE 0.053
Use #374E6B 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.