#2B3748
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.4% 0.034 257.1), rgb(43, 55, 72).
Aa
White text reads best on this color (12.04:1).
About this color
#2B3748 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.034 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.019 away. White text reads best on it, at 12.04:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.74:1 |
| White text | 12.04:1 |
Values
| HEX | #2B3748 |
| RGB | rgb(43, 55, 72) |
| HSL | hsl(215, 25%, 23%) |
| OKLCH | oklch(33.4% 0.034 257.1) |
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 #2B3748 | 12.04:1 | AAA | Lc -101.1 | Preferred for body text |
| Black text on #2B3748 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #2B3748 text on white | 12.04:1 | AAA | Lc 97.6 | Preferred for body text |
| #2B3748 text on black | 1.74:1 | 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
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C2D2
oklch(81% 0.026 255.6)
-
Step 400
400
#91A2BB
oklch(70.7% 0.041 257.9)
-
Step 500
500
#758BAA
oklch(63.1% 0.053 257)
-
Step 600
600
#5E7595
oklch(55.7% 0.057 256.7)
-
Step 700
700
#4D627F
oklch(49.1% 0.053 256.6)
-
Step 800
800
#405067
oklch(42.7% 0.043 257.4)
-
Step 900
900 (this color)
#2B3748
oklch(33.4% 0.034 257.1)
-
Step 950
950
#202731
oklch(27% 0.021 257.3)
#2B3748 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 | 0.010 |
| Deuteranopia (no green cones) | #2E3548 | 0.008 |
| Tritanopia (no blue cones) | #223B3D | 0.030 |
| Achromatopsia (no color) | #363636 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3748
#2B3748
oklch(33.4% 0.034 257.1)
- #403422
#403422
oklch(33.3% 0.034 77.3)
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 #2B3748, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.019
- Gunmetal #293241 ΔE 0.019
- Onyx #343A40 ΔE 0.024
- Space Cadet #2B2D42 ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.034
- Midnight Green #073B4C ΔE 0.035
- Charcoal #264653 ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.048
Use #2B3748 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.