#374666
Closest named color: Dark Grey Blue (#29465B). oklch(39.6% 0.058 264.6), rgb(55, 70, 102).
Aa
White text reads best on this color (9.41:1).
About this color
#374666 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.058 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.028 away. White text reads best on it, at 9.41:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.23:1 |
| White text | 9.41:1 |
Values
| HEX | #374666 |
| RGB | rgb(55, 70, 102) |
| HSL | hsl(221, 30%, 31%) |
| OKLCH | oklch(39.6% 0.058 264.6) |
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 #374666 | 9.41:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #374666 | 2.23:1 | Fails | Lc 12.2 | Not readable |
| #374666 text on white | 9.41:1 | AAA | Lc 91.7 | Preferred for body text |
| #374666 text on black | 2.23:1 | Fails | Lc -10.7 | 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 900.
-
Step 50
50
#F3F5F9
oklch(97% 0.006 264.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B3C1DE
oklch(81% 0.044 264.9)
-
Step 400
400
#8BA0CD
oklch(70.6% 0.07 265.2)
-
Step 500
500
#6F89C0
oklch(63.2% 0.089 264.6)
-
Step 600
600
#5772AC
oklch(55.7% 0.096 264.5)
-
Step 700
700
#475F94
oklch(49.1% 0.09 264.8)
-
Step 800
800
#3B4E78
oklch(42.8% 0.074 264.9)
-
Step 900
900 (this color)
#374666
oklch(39.6% 0.058 264.6)
-
Step 950
950
#1D2639
oklch(27% 0.038 264.5)
#374666 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) | #3B4967 | 0.011 |
| Deuteranopia (no green cones) | #364465 | 0.006 |
| Tritanopia (no blue cones) | #264D51 | 0.053 |
| Achromatopsia (no color) | #464646 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374666
#374666
oklch(39.6% 0.058 264.6)
- #55441F
#55441F
oklch(39.6% 0.058 84.9)
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 #374666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.028
- Charcoal #264653 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.055
- Dark Slate Gray #2F4F4F ΔE 0.057
- Light Navy #155084 ΔE 0.057
- Charcoal Grey #3C4142 ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.063
Use #374666 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.