#374B53
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.9% 0.028 224.5), rgb(55, 75, 83).
Aa
White text reads best on this color (9.15:1).
About this color
#374B53 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.019 away. White text reads best on it, at 9.15:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.29:1 |
| White text | 9.15:1 |
Values
| HEX | #374B53 |
| RGB | rgb(55, 75, 83) |
| HSL | hsl(197, 20%, 27%) |
| OKLCH | oklch(39.9% 0.028 224.5) |
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 #374B53 | 9.15:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #374B53 | 2.29:1 | Fails | Lc 12.9 | Not readable |
| #374B53 text on white | 9.15:1 | AAA | Lc 91.1 | Preferred for body text |
| #374B53 text on black | 2.29:1 | Fails | Lc -11.3 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B3C4CB
oklch(80.9% 0.021 224.4)
-
Step 400
400
#8BA6B1
oklch(70.8% 0.034 224.4)
-
Step 500
500
#6D909D
oklch(63.2% 0.044 222.7)
-
Step 600
600
#557A88
oklch(55.7% 0.047 223.5)
-
Step 700
700
#456673
oklch(49% 0.043 224.5)
-
Step 800
800
#39535E
oklch(42.6% 0.036 226.1)
-
Step 900
900 (this color)
#374B53
oklch(39.9% 0.028 224.5)
-
Step 950
950
#1D282D
oklch(26.9% 0.018 227.5)
#374B53 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) | #474A53 | 0.023 |
| Deuteranopia (no green cones) | #424653 | 0.021 |
| Tritanopia (no blue cones) | #2E4E4D | 0.020 |
| Achromatopsia (no color) | #484848 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374B53
#374B53
oklch(39.9% 0.028 224.5)
- #55433B
#55433B
oklch(40% 0.028 45.2)
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 #374B53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.019
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.036
- Dark Teal #014D4E ΔE 0.046
- Deep Teal #00555A ΔE 0.046
- Dark Blue Green #005249 ΔE 0.053
- Onyx #343A40 ΔE 0.057
Use #374B53 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.