#374B54
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.029 227.4), rgb(55, 75, 84).
Aa
White text reads best on this color (9.14:1).
About this color
#374B54 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 0.020 away. White text reads best on it, at 9.14:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.29:1 |
| White text | 9.14:1 |
Values
| HEX | #374B54 |
| RGB | rgb(55, 75, 84) |
| HSL | hsl(199, 21%, 27%) |
| OKLCH | oklch(40% 0.029 227.4) |
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 #374B54 | 9.14:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #374B54 | 2.29:1 | Fails | Lc 12.9 | Not readable |
| #374B54 text on white | 9.14:1 | AAA | Lc 91.0 | Preferred for body text |
| #374B54 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
#B3C4CC
oklch(81% 0.022 227.6)
-
Step 400
400
#8AA5B2
oklch(70.6% 0.036 228.6)
-
Step 500
500
#6D8F9F
oklch(63% 0.045 228.4)
-
Step 600
600
#55798A
oklch(55.5% 0.048 228.9)
-
Step 700
700
#456675
oklch(49.1% 0.045 228.1)
-
Step 800
800
#39535F
oklch(42.6% 0.037 228.3)
-
Step 900
900 (this color)
#374B54
oklch(40% 0.029 227.4)
-
Step 950
950
#1D282E
oklch(26.9% 0.019 232.2)
#374B54 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) | #464A54 | 0.022 |
| Deuteranopia (no green cones) | #424754 | 0.019 |
| Tritanopia (no blue cones) | #2D4E4E | 0.021 |
| Achromatopsia (no color) | #484848 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374B54
#374B54
oklch(40% 0.029 227.4)
- #55433A
#55433A
oklch(39.9% 0.029 48)
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 #374B54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.020
- Charcoal #264653 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.037
- Deep Teal #00555A ΔE 0.046
- Dark Teal #014D4E ΔE 0.046
- Dark Blue Green #005249 ΔE 0.054
- Onyx #343A40 ΔE 0.057
Use #374B54 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.