#2B3864
Closest named color: Prussian Blue (#1D3557). oklch(35.3% 0.079 269.6), rgb(43, 56, 100).
Aa
White text reads best on this color (11.33:1).
About this color
#2B3864 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.079 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.031 away. White text reads best on it, at 11.33:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.85:1 |
| White text | 11.33:1 |
Values
| HEX | #2B3864 |
| RGB | rgb(43, 56, 100) |
| HSL | hsl(226, 40%, 28%) |
| OKLCH | oklch(35.3% 0.079 269.6) |
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 #2B3864 | 11.33:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #2B3864 | 1.85:1 | Fails | Lc 7.9 | Not readable |
| #2B3864 text on white | 11.33:1 | AAA | Lc 96.0 | Preferred for body text |
| #2B3864 text on black | 1.85:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1C0E8
oklch(81% 0.059 268.9)
-
Step 400
400
#899EDC
oklch(70.7% 0.094 269.5)
-
Step 500
500
#6D85D2
oklch(63.2% 0.12 269.6)
-
Step 600
600
#556DBF
oklch(55.5% 0.13 269.5)
-
Step 700
700
#465BA5
oklch(49.2% 0.121 269.6)
-
Step 800
800
#394A86
oklch(42.6% 0.102 269.8)
-
Step 900
900 (this color)
#2B3864
oklch(35.3% 0.079 269.6)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#2B3864 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) | #263D66 | 0.015 |
| Deuteranopia (no green cones) | #1F3863 | 0.015 |
| Tritanopia (no blue cones) | #0E4249 | 0.071 |
| Achromatopsia (no color) | #3A3A3A | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3864
#2B3864
oklch(35.3% 0.079 269.6)
- #4A3900
#4A3900
oklch(35.3% 0.072 89.9)
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 #2B3864, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.031
- Marine Blue #01386A ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.048
- Twilight Blue #0A437A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.051
- Marine #042E60 ΔE 0.054
- Midnight Green #073B4C ΔE 0.059
- Charcoal #264653 ΔE 0.060
Use #2B3864 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.