#374A68
Closest named color: Dark Grey Blue (#29465B). oklch(40.7% 0.056 259.3), rgb(55, 74, 104).
Aa
White text reads best on this color (8.96:1).
About this color
#374A68 is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.056 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 8.96:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.34:1 |
| White text | 8.96:1 |
Values
| HEX | #374A68 |
| RGB | rgb(55, 74, 104) |
| HSL | hsl(217, 31%, 31%) |
| OKLCH | oklch(40.7% 0.056 259.3) |
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 #374A68 | 8.96:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #374A68 | 2.34:1 | Fails | Lc 13.4 | Not readable |
| #374A68 text on white | 8.96:1 | AAA | Lc 90.5 | Preferred for body text |
| #374A68 text on black | 2.34:1 | Fails | Lc -11.8 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE6
oklch(88.6% 0.019 258.4)
-
Step 300
300
#B4C2D6
oklch(81% 0.032 257.2)
-
Step 400
400
#8DA2C2
oklch(70.7% 0.053 258.7)
-
Step 500
500
#718BB3
oklch(63.2% 0.068 258.9)
-
Step 600
600
#59749E
oklch(55.5% 0.073 259)
-
Step 700
700
#496187
oklch(49% 0.068 259.4)
-
Step 800
800 (this color)
#374A68
oklch(40.7% 0.056 259.3)
-
Step 900
900
#344259
oklch(37.7% 0.044 260.2)
-
Step 950
950
#1E2734
oklch(27% 0.028 257.5)
#374A68 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) | #3F4C69 | 0.013 |
| Deuteranopia (no green cones) | #394767 | 0.009 |
| Tritanopia (no blue cones) | #245054 | 0.050 |
| Achromatopsia (no color) | #494949 | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A68
#374A68
oklch(40.7% 0.056 259.3)
- #5A4624
#5A4624
oklch(40.7% 0.057 79.4)
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 #374A68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.044
- Dark Slate Gray #2F4F4F ΔE 0.052
- Light Navy #155084 ΔE 0.052
- YInMn Blue #415A77 ΔE 0.054
- Deep Sea Blue #015482 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.059
- Dusk #4E5481 ΔE 0.060
Use #374A68 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.