#374C54
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.2% 0.029 223.4), rgb(55, 76, 84).
Aa
White text reads best on this color (9.03:1).
About this color
#374C54 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.018 away. White text reads best on it, at 9.03:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.03:1 |
Values
| HEX | #374C54 |
| RGB | rgb(55, 76, 84) |
| HSL | hsl(197, 21%, 27%) |
| OKLCH | oklch(40.2% 0.029 223.4) |
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 #374C54 | 9.03:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #374C54 | 2.32:1 | Fails | Lc 13.2 | Not readable |
| #374C54 text on white | 9.03:1 | AAA | Lc 90.7 | Preferred for body text |
| #374C54 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 800.
-
Step 50
50
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D3DBDE
oklch(88.6% 0.01 222.1)
-
Step 300
300
#B5C3C9
oklch(80.8% 0.018 225.2)
-
Step 400
400
#8FA5AD
oklch(70.8% 0.027 221.7)
-
Step 500
500
#738F99
oklch(63.2% 0.035 221.6)
-
Step 600
600
#5B7984
oklch(55.7% 0.038 222.4)
-
Step 700
700
#4B6570
oklch(49% 0.035 225.8)
-
Step 800
800 (this color)
#374C54
oklch(40.2% 0.029 223.4)
-
Step 900
900
#35444B
oklch(37.6% 0.023 228)
-
Step 950
950
#1F282C
oklch(27% 0.015 226.6)
#374C54 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) | #474B54 | 0.023 |
| Deuteranopia (no green cones) | #434754 | 0.022 |
| Tritanopia (no blue cones) | #2D4F4E | 0.021 |
| Achromatopsia (no color) | #494949 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374C54
#374C54
oklch(40.2% 0.029 223.4)
- #56433C
#56433C
oklch(40.1% 0.029 41.2)
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 #374C54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.018
- Charcoal #264653 ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.039
- Deep Teal #00555A ΔE 0.044
- Dark Teal #014D4E ΔE 0.046
- Dark Blue Green #005249 ΔE 0.053
- Onyx #343A40 ΔE 0.060
Use #374C54 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.