#374B59
Closest named color: Dark Grey Blue (#29465B). oklch(40.2% 0.034 239.2), rgb(55, 75, 89).
Aa
White text reads best on this color (9.07:1).
About this color
#374B59 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.034 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 9.07:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.31:1 |
| White text | 9.07:1 |
Values
| HEX | #374B59 |
| RGB | rgb(55, 75, 89) |
| HSL | hsl(205, 24%, 28%) |
| OKLCH | oklch(40.2% 0.034 239.2) |
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 #374B59 | 9.07:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #374B59 | 2.31:1 | Fails | Lc 13.1 | Not readable |
| #374B59 text on white | 9.07:1 | AAA | Lc 90.9 | Preferred for body text |
| #374B59 text on black | 2.31:1 | Fails | Lc -11.5 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B2C3D0
oklch(80.8% 0.026 240.7)
-
Step 400
400
#8AA5B8
oklch(70.8% 0.041 238.8)
-
Step 500
500
#6C8EA6
oklch(63% 0.053 239.4)
-
Step 600
600
#547892
oklch(55.6% 0.058 240.5)
-
Step 700
700
#44657C
oklch(49.1% 0.053 239.6)
-
Step 800
800
#385365
oklch(42.8% 0.044 238.3)
-
Step 900
900 (this color)
#374B59
oklch(40.2% 0.034 239.2)
-
Step 950
950
#1D2830
oklch(27% 0.021 240.1)
#374B59 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) | #454B5A | 0.021 |
| Deuteranopia (no green cones) | #404759 | 0.017 |
| Tritanopia (no blue cones) | #2C4F4F | 0.028 |
| Achromatopsia (no color) | #484848 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374B59
#374B59
oklch(40.2% 0.034 239.2)
- #564436
#564436
oklch(40.2% 0.034 59.5)
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 #374B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Dark Slate Gray #2F4F4F ΔE 0.027
- Charcoal #264653 ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.042
- Deep Teal #00555A ΔE 0.048
- Dark Teal #014D4E ΔE 0.050
- Dark Blue Green #005249 ΔE 0.060
- Onyx #343A40 ΔE 0.061
Use #374B59 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.