#2B3F64
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.069 262), rgb(43, 63, 100).
Aa
White text reads best on this color (10.51:1).
About this color
#2B3F64 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.069 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #2B3F64 |
| RGB | rgb(43, 63, 100) |
| HSL | hsl(219, 40%, 28%) |
| OKLCH | oklch(36.9% 0.069 262) |
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 #2B3F64 | 10.51:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #2B3F64 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #2B3F64 text on white | 10.51:1 | AAA | Lc 94.3 | Preferred for body text |
| #2B3F64 text on black | 1.99:1 | Fails | Lc -8.3 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAED
oklch(88.6% 0.029 261.5)
-
Step 300
300
#AFC1E3
oklch(80.9% 0.052 263.1)
-
Step 400
400
#84A1D5
oklch(70.7% 0.083 261.8)
-
Step 500
500
#6689CA
oklch(63.2% 0.106 262.1)
-
Step 600
600
#4D72B6
oklch(55.6% 0.114 261.7)
-
Step 700
700
#3E5F9D
oklch(49.1% 0.107 262)
-
Step 800
800
#334E7F
oklch(42.7% 0.088 261.5)
-
Step 900
900 (this color)
#2B3F64
oklch(36.9% 0.069 262)
-
Step 950
950
#1A263C
oklch(26.9% 0.045 261.9)
#2B3F64 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) | #304266 | 0.012 |
| Deuteranopia (no green cones) | #293D63 | 0.007 |
| Tritanopia (no blue cones) | #0C474C | 0.063 |
| Achromatopsia (no color) | #3F3F3F | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3F64
#2B3F64
oklch(36.9% 0.069 262)
- #523B0B
#523B0B
oklch(36.9% 0.069 81)
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 #2B3F64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.042
- Charcoal #264653 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.045
- Marine Blue #01386A ΔE 0.046
- Midnight Green #073B4C ΔE 0.057
- Onyx #343A40 ΔE 0.061
Use #2B3F64 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.