#374E65
Closest named color: Dark Grey Blue (#29465B). oklch(41.5% 0.048 249), rgb(55, 78, 101).
Aa
White text reads best on this color (8.60:1).
About this color
#374E65 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.048 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.035 away. White text reads best on it, at 8.60:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.44:1 |
| White text | 8.60:1 |
Values
| HEX | #374E65 |
| RGB | rgb(55, 78, 101) |
| HSL | hsl(210, 29%, 31%) |
| OKLCH | oklch(41.5% 0.048 249) |
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 #374E65 | 8.60:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #374E65 | 2.44:1 | Fails | Lc 14.5 | Not readable |
| #374E65 text on white | 8.60:1 | AAA | Lc 89.5 | Fine for body text |
| #374E65 text on black | 2.44:1 | Fails | Lc -12.7 | 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
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE3
oklch(88.5% 0.015 251.2)
-
Step 300
300
#B3C3D2
oklch(81% 0.028 246.4)
-
Step 400
400
#8BA3BC
oklch(70.6% 0.046 249.5)
-
Step 500
500
#6F8DAB
oklch(63.2% 0.057 248.7)
-
Step 600
600
#567797
oklch(55.7% 0.063 248.2)
-
Step 700
700
#476481
oklch(49.3% 0.058 249.1)
-
Step 800
800 (this color)
#374E65
oklch(41.5% 0.048 249)
-
Step 900
900
#324355
oklch(37.6% 0.038 250.3)
-
Step 950
950
#1D2832
oklch(27.1% 0.024 246.3)
#374E65 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) | #454F66 | 0.020 |
| Deuteranopia (no green cones) | #3F4A65 | 0.016 |
| Tritanopia (no blue cones) | #255356 | 0.040 |
| Achromatopsia (no color) | #4C4C4C | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E65
#374E65
oklch(41.5% 0.048 249)
- #5D472E
#5D472E
oklch(41.5% 0.049 69.4)
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 #374E65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.041
- Charcoal #264653 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.046
- Deep Teal #00555A ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.056
- Light Navy #155084 ΔE 0.057
- Dusty Grape #545775 ΔE 0.057
Use #374E65 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.