#374E40
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.037 157.5), rgb(55, 78, 64).
Aa
White text reads best on this color (9.02:1).
About this color
#374E40 is a dark, muted green. In OKLCH its lightness is 40%, its chroma 0.037 and its hue 158°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.025 away. White text reads best on it, at 9.02:1.
| Hue family | Greens |
| Lightness | dark (40%) |
| Chroma | muted (0.037) |
| Temperature | in between |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.02:1 |
Values
| HEX | #374E40 |
| RGB | rgb(55, 78, 64) |
| HSL | hsl(143, 17%, 26%) |
| OKLCH | oklch(40% 0.037 157.5) |
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 #374E40 | 9.02:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #374E40 | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #374E40 text on white | 9.02:1 | AAA | Lc 90.7 | Preferred for body text |
| #374E40 text on black | 2.32:1 | Fails | Lc -11.6 | 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
#F3F6F4
oklch(97% 0.004 157.2)
-
Step 100
100
#E6EBE8
oklch(93.5% 0.007 160.1)
-
Step 200
200
#D1DCD5
oklch(88.4% 0.015 158.2)
-
Step 300
300
#B3C6BA
oklch(80.9% 0.027 158.1)
-
Step 400
400
#8AA996
oklch(70.6% 0.044 158.2)
-
Step 500
500
#6D947C
oklch(63.1% 0.056 157.3)
-
Step 600
600
#547E65
oklch(55.5% 0.061 157.6)
-
Step 700
700
#446B54
oklch(49.2% 0.058 157.6)
-
Step 800
800
#385745
oklch(42.7% 0.048 158.1)
-
Step 900
900 (this color)
#374E40
oklch(40% 0.037 157.5)
-
Step 950
950
#1D2A22
oklch(27% 0.023 157.4)
#374E40 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) | #4E4A3F | 0.035 |
| Deuteranopia (no green cones) | #4A4841 | 0.033 |
| Tritanopia (no blue cones) | #334E4A | 0.017 |
| Achromatopsia (no color) | #494949 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E40
#374E40
oklch(40% 0.037 157.5)
- #55404F
#55404F
oklch(40% 0.037 336.9)
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 #374E40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.025
- Dark Blue Green #005249 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.044
- Dark Teal #014D4E ΔE 0.047
- Deep Teal #00555A ΔE 0.051
- Charcoal #264653 ΔE 0.052
- Pine #2B5D34 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.062
Use #374E40 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.