#37434F
Closest named color: Charcoal Grey (#3C4142). oklch(37.7% 0.026 248.5), rgb(55, 67, 79).
Aa
White text reads best on this color (10.10:1).
About this color
#37434F is a dark close to neutral grey. In OKLCH its lightness is 38%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Charcoal Grey (#3C4142), ΔE 0.022 away. White text reads best on it, at 10.10:1.
| Hue family | Neutrals |
| Lightness | dark (38%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Charcoal Grey (#3C4142) |
| Black text | 2.07:1 |
| White text | 10.10:1 |
Values
| HEX | #37434F |
| RGB | rgb(55, 67, 79) |
| HSL | hsl(210, 18%, 26%) |
| OKLCH | oklch(37.7% 0.026 248.5) |
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 #37434F | 10.10:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #37434F | 2.07:1 | Fails | Lc 10.5 | Not readable |
| #37434F text on white | 10.10:1 | AAA | Lc 93.5 | Preferred for body text |
| #37434F text on black | 2.07:1 | Fails | Lc -9.0 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DAE0
oklch(88.6% 0.011 247.9)
-
Step 300
300
#B7C2CD
oklch(80.9% 0.02 248.1)
-
Step 400
400
#92A3B4
oklch(70.8% 0.031 248.3)
-
Step 500
500
#778CA1
oklch(63.1% 0.04 248.5)
-
Step 600
600
#60768C
oklch(55.6% 0.043 248.6)
-
Step 700
700
#4F6377
oklch(49.1% 0.04 248.7)
-
Step 800
800
#415161
oklch(42.8% 0.033 248.6)
-
Step 900
900 (this color)
#37434F
oklch(37.7% 0.026 248.5)
-
Step 950
950
#20272E
oklch(26.9% 0.016 248.4)
#37434F 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) | #3E4350 | 0.011 |
| Deuteranopia (no green cones) | #3C414F | 0.009 |
| Tritanopia (no blue cones) | #304647 | 0.022 |
| Achromatopsia (no color) | #424242 | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37434F
#37434F
oklch(37.7% 0.026 248.5)
- #4B3F33
#4B3F33
oklch(37.7% 0.026 66.9)
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 #37434F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal Grey #3C4142 ΔE 0.022
- Charcoal #264653 ΔE 0.022
- Dark Grey Blue #29465B ΔE 0.025
- Onyx #343A40 ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.044
- Dark Teal #014D4E ΔE 0.053
- Midnight Green #073B4C ΔE 0.060
Use #37434F 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.