#374E69
Closest named color: Dark Grey Blue (#29465B). oklch(41.7% 0.054 253), rgb(55, 78, 105).
Aa
White text reads best on this color (8.54:1).
About this color
#374E69 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.054 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.038 away. White text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #374E69 |
| RGB | rgb(55, 78, 105) |
| HSL | hsl(212, 31%, 31%) |
| OKLCH | oklch(41.7% 0.054 253) |
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 #374E69 | 8.54:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #374E69 | 2.45:1 | Fails | Lc 14.6 | Not readable |
| #374E69 text on white | 8.54:1 | AAA | Lc 89.3 | Fine for body text |
| #374E69 text on black | 2.45:1 | Fails | Lc -12.9 | 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
#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
#B3C2D5
oklch(80.9% 0.032 254.3)
-
Step 400
400
#8BA3C0
oklch(70.7% 0.05 253.3)
-
Step 500
500
#6E8CB0
oklch(63.1% 0.064 253.3)
-
Step 600
600
#56769B
oklch(55.6% 0.069 252.6)
-
Step 700
700
#466385
oklch(49.1% 0.065 253)
-
Step 800
800 (this color)
#374E69
oklch(41.7% 0.054 253)
-
Step 900
900
#324357
oklch(37.7% 0.041 252.9)
-
Step 950
950
#1D2733
oklch(26.9% 0.027 253.3)
#374E69 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) | #444F6A | 0.019 |
| Deuteranopia (no green cones) | #3D4A68 | 0.014 |
| Tritanopia (no blue cones) | #235457 | 0.047 |
| Achromatopsia (no color) | #4C4C4C | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E69
#374E69
oklch(41.7% 0.054 253)
- #5E482A
#5E482A
oklch(41.8% 0.054 74)
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 #374E69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.038
- YInMn Blue #415A77 ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.048
- Charcoal #264653 ΔE 0.048
- Light Navy #155084 ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.052
- Dusk #4E5481 ΔE 0.055
- Dusty Grape #545775 ΔE 0.055
Use #374E69 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.