#374258
Closest named color: Dark Grey Blue (#29465B). oklch(37.9% 0.041 263.9), rgb(55, 66, 88).
Aa
White text reads best on this color (10.08:1).
About this color
#374258 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.041 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.020 away. White text reads best on it, at 10.08:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.08:1 |
| White text | 10.08:1 |
Values
| HEX | #374258 |
| RGB | rgb(55, 66, 88) |
| HSL | hsl(220, 23%, 28%) |
| OKLCH | oklch(37.9% 0.041 263.9) |
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 #374258 | 10.08:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #374258 | 2.08:1 | Fails | Lc 10.5 | Not readable |
| #374258 text on white | 10.08:1 | AAA | Lc 93.4 | Preferred for body text |
| #374258 text on black | 2.08:1 | Fails | Lc -9.1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3D9E5
oklch(88.4% 0.018 264.5)
-
Step 300
300
#B7C1D5
oklch(80.9% 0.03 264.4)
-
Step 400
400
#91A1C0
oklch(70.7% 0.049 263.6)
-
Step 500
500
#768AB0
oklch(63.2% 0.062 263)
-
Step 600
600
#5F739B
oklch(55.6% 0.067 263.8)
-
Step 700
700
#4E6085
oklch(49% 0.064 264.2)
-
Step 800
800
#404F6C
oklch(42.7% 0.052 263.2)
-
Step 900
900 (this color)
#374258
oklch(37.9% 0.041 263.9)
-
Step 950
950
#202633
oklch(26.9% 0.026 265.4)
#374258 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) | #3B4359 | 0.007 |
| Deuteranopia (no green cones) | #374057 | 0.006 |
| Tritanopia (no blue cones) | #2D4649 | 0.036 |
| Achromatopsia (no color) | #424242 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374258
#374258
oklch(37.9% 0.041 263.9)
- #4C4029
#4C4029
oklch(37.8% 0.04 83.1)
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 #374258, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.020
- Charcoal #264653 ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.038
- Onyx #343A40 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.045
- Dark Slate Gray #2F4F4F ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.058
- Midnight Green #073B4C ΔE 0.062
Use #374258 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.