#2F3748
Closest named color: Onyx (#343A40). oklch(33.7% 0.032 265.1), rgb(47, 55, 72).
Aa
White text reads best on this color (11.92:1).
About this color
#2F3748 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.032 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.021 away. White text reads best on it, at 11.92:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.76:1 |
| White text | 11.92:1 |
Values
| HEX | #2F3748 |
| RGB | rgb(47, 55, 72) |
| HSL | hsl(221, 21%, 23%) |
| OKLCH | oklch(33.7% 0.032 265.1) |
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 #2F3748 | 11.92:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #2F3748 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #2F3748 text on white | 11.92:1 | AAA | Lc 97.3 | Preferred for body text |
| #2F3748 text on black | 1.76:1 | Fails | Lc 0.0 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D5D9E2
oklch(88.5% 0.013 266.7)
-
Step 300
300
#B9C1D1
oklch(81% 0.024 264.4)
-
Step 400
400
#95A1B9
oklch(70.8% 0.038 264.3)
-
Step 500
500
#7B89A8
oklch(63% 0.05 265.9)
-
Step 600
600
#647393
oklch(55.6% 0.053 265.1)
-
Step 700
700
#53617D
oklch(49.2% 0.048 264)
-
Step 800
800
#444F66
oklch(42.7% 0.041 264.8)
-
Step 900
900 (this color)
#2F3748
oklch(33.7% 0.032 265.1)
-
Step 950
950
#222631
oklch(27% 0.021 269.3)
#2F3748 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) | #313849 | 0.005 |
| Deuteranopia (no green cones) | #2F3648 | 0.003 |
| Tritanopia (no blue cones) | #283A3D | 0.027 |
| Achromatopsia (no color) | #373737 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F3748
#2F3748
oklch(33.7% 0.032 265.1)
- #3F3624
#3F3624
oklch(33.7% 0.032 84.2)
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 #2F3748, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.021
- Gunmetal #293241 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.023
- Space Cadet #2B2D42 ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.037
- Midnight Green #073B4C ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.045
- Charcoal #264653 ΔE 0.047
Use #2F3748 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.