#374A40
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39% 0.029 161.7), rgb(55, 74, 64).
Aa
White text reads best on this color (9.47:1).
About this color
#374A40 is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.025 away. White text reads best on it, at 9.47:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #374A40 |
| RGB | rgb(55, 74, 64) |
| HSL | hsl(148, 15%, 25%) |
| OKLCH | oklch(39% 0.029 161.7) |
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 #374A40 | 9.47:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #374A40 | 2.21:1 | Fails | Lc 12.0 | Not readable |
| #374A40 text on white | 9.47:1 | AAA | Lc 91.9 | Preferred for body text |
| #374A40 text on black | 2.21:1 | Fails | Lc -10.5 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E6EBE8
oklch(93.5% 0.007 160.1)
-
Step 200
200
#D2DCD6
oklch(88.5% 0.013 159.9)
-
Step 300
300
#B5C5BC
oklch(80.9% 0.021 161.3)
-
Step 400
400
#8EA89A
oklch(70.8% 0.035 161.9)
-
Step 500
500
#729281
oklch(63.1% 0.044 161.6)
-
Step 600
600
#597D6A
oklch(55.7% 0.05 161.2)
-
Step 700
700
#496959
oklch(49.1% 0.045 162.4)
-
Step 800
800
#3C5649
oklch(42.8% 0.038 162.5)
-
Step 900
900 (this color)
#374A40
oklch(39% 0.029 161.7)
-
Step 950
950
#1E2924
oklch(26.9% 0.018 165.6)
#374A40 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) | #494740 | 0.028 |
| Deuteranopia (no green cones) | #464541 | 0.027 |
| Tritanopia (no blue cones) | #334A47 | 0.012 |
| Achromatopsia (no color) | #464646 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A40
#374A40
oklch(39% 0.029 161.7)
- #503F49
#503F49
oklch(38.9% 0.028 342.4)
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 #374A40, 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
- Charcoal Grey #3C4142 ΔE 0.031
- Charcoal #264653 ΔE 0.043
- Dark Blue Green #005249 ΔE 0.044
- Dark Teal #014D4E ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.054
- Deep Teal #00555A ΔE 0.054
- Onyx #343A40 ΔE 0.054
Use #374A40 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.