#374C4E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.026 203.5), rgb(55, 76, 78).
Aa
White text reads best on this color (9.10:1).
About this color
#374C4E is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.013 away. White text reads best on it, at 9.10:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.30:1 |
| White text | 9.10:1 |
Values
| HEX | #374C4E |
| RGB | rgb(55, 76, 78) |
| HSL | hsl(185, 17%, 26%) |
| OKLCH | oklch(40% 0.026 203.5) |
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 #374C4E | 9.10:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #374C4E | 2.30:1 | Fails | Lc 13.0 | Not readable |
| #374C4E text on white | 9.10:1 | AAA | Lc 90.9 | Preferred for body text |
| #374C4E text on black | 2.30:1 | Fails | Lc -11.4 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D1DBDC
oklch(88.4% 0.011 204.1)
-
Step 300
300
#B3C5C6
oklch(81% 0.02 200.8)
-
Step 400
400
#8AA7A9
oklch(70.7% 0.032 201.6)
-
Step 500
500
#6D9194
oklch(63.1% 0.04 202.6)
-
Step 600
600
#547B7F
oklch(55.5% 0.044 204)
-
Step 700
700
#45686B
oklch(49.2% 0.04 202.7)
-
Step 800
800
#395557
oklch(42.8% 0.034 201.6)
-
Step 900
900 (this color)
#374C4E
oklch(40% 0.026 203.5)
-
Step 950
950
#1D292A
oklch(27% 0.017 202.6)
#374C4E 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) | #494A4E | 0.027 |
| Deuteranopia (no green cones) | #45474E | 0.025 |
| Tritanopia (no blue cones) | #2F4E4D | 0.012 |
| Achromatopsia (no color) | #484848 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374C4E
#374C4E
oklch(40% 0.026 203.5)
- #554241
#554241
oklch(39.9% 0.027 21.8)
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 #374C4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.013
- Charcoal #264653 ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.039
- Dark Teal #014D4E ΔE 0.043
- Deep Teal #00555A ΔE 0.044
- Dark Blue Green #005249 ΔE 0.047
- Onyx #343A40 ΔE 0.058
Use #374C4E 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.