#374F5C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.3% 0.037 232.5), rgb(55, 79, 92).
Aa
White text reads best on this color (8.62:1).
About this color
#374F5C is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.037 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.026 away. White text reads best on it, at 8.62:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.43:1 |
| White text | 8.62:1 |
Values
| HEX | #374F5C |
| RGB | rgb(55, 79, 92) |
| HSL | hsl(201, 25%, 29%) |
| OKLCH | oklch(41.3% 0.037 232.5) |
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 #374F5C | 8.62:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #374F5C | 2.43:1 | Fails | Lc 14.4 | Not readable |
| #374F5C text on white | 8.62:1 | AAA | Lc 89.6 | Fine for body text |
| #374F5C text on black | 2.43:1 | Fails | Lc -12.7 | 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 800.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D2DBE0
oklch(88.6% 0.012 231.7)
-
Step 300
300
#B4C3CC
oklch(80.8% 0.021 233.9)
-
Step 400
400
#8CA5B3
oklch(70.7% 0.035 232.5)
-
Step 500
500
#6F8FA0
oklch(63.2% 0.044 231.5)
-
Step 600
600
#57798B
oklch(55.7% 0.048 231.8)
-
Step 700
700
#476576
oklch(49% 0.044 233.7)
-
Step 800
800 (this color)
#374F5C
oklch(41.3% 0.037 232.5)
-
Step 900
900
#32444E
oklch(37.5% 0.029 232.8)
-
Step 950
950
#1E282E
oklch(27% 0.018 234.7)
#374F5C 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) | #494E5D | 0.026 |
| Deuteranopia (no green cones) | #434A5C | 0.022 |
| Tritanopia (no blue cones) | #2A5353 | 0.028 |
| Achromatopsia (no color) | #4C4C4C | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F5C
#374F5C
oklch(41.3% 0.037 232.5)
- #5C4639
#5C4639
oklch(41.4% 0.037 52)
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 #374F5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.039
- Deep Teal #00555A ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.052
- Dark Teal #014D4E ΔE 0.052
- YInMn Blue #415A77 ΔE 0.053
- Petrol #005F6A ΔE 0.055
Use #374F5C 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.