#374F5F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.5% 0.04 238.2), rgb(55, 79, 95).
Aa
White text reads best on this color (8.58:1).
About this color
#374F5F is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.040 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 8.58:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #374F5F |
| RGB | rgb(55, 79, 95) |
| HSL | hsl(204, 27%, 29%) |
| OKLCH | oklch(41.5% 0.04 238.2) |
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 #374F5F | 8.58:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #374F5F | 2.44:1 | Fails | Lc 14.5 | Not readable |
| #374F5F text on white | 8.58:1 | AAA | Lc 89.5 | Fine for body text |
| #374F5F text on black | 2.44:1 | Fails | Lc -12.8 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBEE
oklch(93.7% 0.007 233.6)
-
Step 200
200
#D2DBE1
oklch(88.6% 0.013 236.6)
-
Step 300
300
#B3C3CE
oklch(80.8% 0.023 237.7)
-
Step 400
400
#8CA4B5
oklch(70.6% 0.037 238.9)
-
Step 500
500
#6F8EA3
oklch(63.1% 0.047 238.1)
-
Step 600
600
#57788E
oklch(55.6% 0.051 238.1)
-
Step 700
700
#476579
oklch(49.1% 0.048 238.2)
-
Step 800
800 (this color)
#374F5F
oklch(41.5% 0.04 238.2)
-
Step 900
900
#324450
oklch(37.6% 0.031 237.8)
-
Step 950
950
#1E282F
oklch(27% 0.019 238.9)
#374F5F 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) | #484F60 | 0.024 |
| Deuteranopia (no green cones) | #424A5F | 0.021 |
| Tritanopia (no blue cones) | #285354 | 0.031 |
| Achromatopsia (no color) | #4C4C4C | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F5F
#374F5F
oklch(41.5% 0.04 238.2)
- #5C4636
#5C4636
oklch(41.3% 0.04 57.4)
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 #374F5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal #264653 ΔE 0.041
- Deep Teal #00555A ΔE 0.045
- YInMn Blue #415A77 ΔE 0.050
- Petrol #005F6A ΔE 0.055
- Dark Teal #014D4E ΔE 0.055
- Charcoal Grey #3C4142 ΔE 0.055
Use #374F5F 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.