#2B3A63
Closest named color: Prussian Blue (#1D3557). oklch(35.7% 0.074 267.4), rgb(43, 58, 99).
Aa
White text reads best on this color (11.12:1).
About this color
#2B3A63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.074 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.032 away. White text reads best on it, at 11.12:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.88:1 |
| White text | 11.12:1 |
Values
| HEX | #2B3A63 |
| RGB | rgb(43, 58, 99) |
| HSL | hsl(224, 39%, 28%) |
| OKLCH | oklch(35.7% 0.074 267.4) |
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 #2B3A63 | 11.12:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #2B3A63 | 1.88:1 | Fails | Lc 8.3 | Not readable |
| #2B3A63 text on white | 11.12:1 | AAA | Lc 95.6 | Preferred for body text |
| #2B3A63 text on black | 1.88:1 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B1C0E6
oklch(80.9% 0.056 268.2)
-
Step 400
400
#889FD9
oklch(70.7% 0.089 267.5)
-
Step 500
500
#6B86CE
oklch(63% 0.113 267.5)
-
Step 600
600
#536FBB
oklch(55.6% 0.123 267.1)
-
Step 700
700
#445CA2
oklch(49.1% 0.116 267.8)
-
Step 800
800
#384C83
oklch(42.8% 0.095 267.3)
-
Step 900
900 (this color)
#2B3A63
oklch(35.7% 0.074 267.4)
-
Step 950
950
#1C253D
oklch(26.9% 0.047 267.6)
#2B3A63 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) | #293E65 | 0.012 |
| Deuteranopia (no green cones) | #233962 | 0.011 |
| Tritanopia (no blue cones) | #0F4349 | 0.067 |
| Achromatopsia (no color) | #3B3B3B | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3A63
#2B3A63
oklch(35.7% 0.074 267.4)
- #4C3900
#4C3900
oklch(35.6% 0.073 87.6)
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 #2B3A63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.032
- Marine Blue #01386A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.044
- Twilight Blue #0A437A ΔE 0.048
- Charcoal #264653 ΔE 0.054
- Midnight Green #073B4C ΔE 0.056
- Marine #042E60 ΔE 0.058
Use #2B3A63 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.