#37494B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.1% 0.023 204.7), rgb(55, 73, 75).
Aa
White text reads best on this color (9.47:1).
About this color
#37494B is a dark close to neutral grey. In OKLCH its lightness is 39%, its chroma 0.023. 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 9.47:1.
| Hue family | Neutrals |
| Lightness | dark (39%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #37494B |
| RGB | rgb(55, 73, 75) |
| HSL | hsl(186, 15%, 25%) |
| OKLCH | oklch(39.1% 0.023 204.7) |
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 #37494B | 9.47:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #37494B | 2.21:1 | Fails | Lc 12.0 | Not readable |
| #37494B text on white | 9.47:1 | AAA | Lc 91.9 | Preferred for body text |
| #37494B 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEB
oklch(93.6% 0.005 197.1)
-
Step 200
200
#D2DBDC
oklch(88.5% 0.01 204.9)
-
Step 300
300
#B5C4C6
oklch(80.9% 0.017 206.4)
-
Step 400
400
#8DA6A9
oklch(70.7% 0.028 205.4)
-
Step 500
500
#719093
oklch(63.1% 0.035 203.6)
-
Step 600
600
#597A7E
oklch(55.6% 0.038 205.5)
-
Step 700
700
#49676A
oklch(49.2% 0.035 203.8)
-
Step 800
800
#3C5457
oklch(42.8% 0.03 205.7)
-
Step 900
900 (this color)
#37494B
oklch(39.1% 0.023 204.7)
-
Step 950
950
#1E292A
oklch(27.1% 0.015 203.2)
#37494B 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) | #46474B | 0.023 |
| Deuteranopia (no green cones) | #43454B | 0.021 |
| Tritanopia (no blue cones) | #314A4A | 0.009 |
| Achromatopsia (no color) | #464646 | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37494B
#37494B
oklch(39.1% 0.023 204.7)
- #51413F
#51413F
oklch(39.2% 0.023 26.5)
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 #37494B, 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 Grey #3C4142 ΔE 0.026
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.036
- Dark Teal #014D4E ΔE 0.043
- Onyx #343A40 ΔE 0.048
- Dark Blue Green #005249 ΔE 0.050
- Deep Teal #00555A ΔE 0.050
Use #37494B 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.