#374E63
Closest named color: Dark Grey Blue (#29465B). oklch(41.4% 0.045 246.7), rgb(55, 78, 99).
Aa
White text reads best on this color (8.63:1).
About this color
#374E63 is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.045 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 8.63:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.43:1 |
| White text | 8.63:1 |
Values
| HEX | #374E63 |
| RGB | rgb(55, 78, 99) |
| HSL | hsl(209, 29%, 30%) |
| OKLCH | oklch(41.4% 0.045 246.7) |
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 #374E63 | 8.63:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #374E63 | 2.43:1 | Fails | Lc 14.4 | Not readable |
| #374E63 text on white | 8.63:1 | AAA | Lc 89.6 | Fine for body text |
| #374E63 text on black | 2.43:1 | Fails | Lc -12.6 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE3
oklch(88.5% 0.015 251.2)
-
Step 300
300
#B3C3D1
oklch(80.9% 0.026 244.5)
-
Step 400
400
#8CA4BA
oklch(70.8% 0.042 246.1)
-
Step 500
500
#6F8DA9
oklch(63.1% 0.054 246.9)
-
Step 600
600
#577794
oklch(55.6% 0.058 246.4)
-
Step 700
700
#47647E
oklch(49.1% 0.054 246.2)
-
Step 800
800 (this color)
#374E63
oklch(41.4% 0.045 246.7)
-
Step 900
900
#324454
oklch(37.8% 0.036 245.8)
-
Step 950
950
#1E2831
oklch(27.1% 0.022 245.9)
#374E63 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) | #464E64 | 0.021 |
| Deuteranopia (no green cones) | #404A63 | 0.017 |
| Tritanopia (no blue cones) | #265355 | 0.038 |
| Achromatopsia (no color) | #4C4C4C | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E63
#374E63
oklch(41.4% 0.045 246.7)
- #5C4731
#5C4731
oklch(41.4% 0.045 67.4)
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 #374E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.038
- Charcoal #264653 ΔE 0.042
- YInMn Blue #415A77 ΔE 0.047
- Deep Teal #00555A ΔE 0.050
- Petrol #005F6A ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.059
- Charcoal Grey #3C4142 ΔE 0.059
Use #374E63 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.