#2B3F63
Closest named color: Dark Grey Blue (#29465B). oklch(36.9% 0.067 261.5), rgb(43, 63, 99).
Aa
White text reads best on this color (10.53:1).
About this color
#2B3F63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.067 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.029 away. White text reads best on it, at 10.53:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #2B3F63 |
| RGB | rgb(43, 63, 99) |
| HSL | hsl(219, 39%, 28%) |
| OKLCH | oklch(36.9% 0.067 261.5) |
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 #2B3F63 | 10.53:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #2B3F63 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #2B3F63 text on white | 10.53:1 | AAA | Lc 94.3 | Preferred for body text |
| #2B3F63 text on black | 1.99:1 | Fails | Lc -8.2 | 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
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AFC1E2
oklch(80.8% 0.051 262.6)
-
Step 400
400
#85A1D4
oklch(70.7% 0.081 262.2)
-
Step 500
500
#6689C8
oklch(63.1% 0.103 261.6)
-
Step 600
600
#4D72B5
oklch(55.6% 0.113 261.5)
-
Step 700
700
#3E5F9C
oklch(49% 0.106 261.8)
-
Step 800
800
#344E7E
oklch(42.7% 0.086 261.8)
-
Step 900
900 (this color)
#2B3F63
oklch(36.9% 0.067 261.5)
-
Step 950
950
#1B263B
oklch(26.9% 0.042 262.7)
#2B3F63 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) | #314264 | 0.013 |
| Deuteranopia (no green cones) | #2A3D62 | 0.007 |
| Tritanopia (no blue cones) | #0E474C | 0.061 |
| Achromatopsia (no color) | #3F3F3F | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3F63
#2B3F63
oklch(36.9% 0.067 261.5)
- #513B0D
#513B0D
oklch(36.8% 0.067 81.5)
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 #2B3F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.029
- Charcoal #264653 ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.043
- Twilight Blue #0A437A ΔE 0.045
- Marine Blue #01386A ΔE 0.047
- Midnight Green #073B4C ΔE 0.056
- Onyx #343A40 ΔE 0.060
Use #2B3F63 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.