#2B4371
Closest named color: Twilight Blue (#0A437A). oklch(38.7% 0.084 262.3), rgb(43, 67, 113).
Aa
White text reads best on this color (9.79:1).
About this color
#2B4371 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.084 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.030 away. White text reads best on it, at 9.79:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.79:1 |
Values
| HEX | #2B4371 |
| RGB | rgb(43, 67, 113) |
| HSL | hsl(219, 45%, 31%) |
| OKLCH | oklch(38.7% 0.084 262.3) |
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 #2B4371 | 9.79:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #2B4371 | 2.14:1 | Fails | Lc 11.4 | Not readable |
| #2B4371 text on white | 9.79:1 | AAA | Lc 92.6 | Preferred for body text |
| #2B4371 text on black | 2.14:1 | Fails | Lc -9.9 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ABC1EA
oklch(80.8% 0.063 262.8)
-
Step 400
400
#7EA0E0
oklch(70.6% 0.102 262.6)
-
Step 500
500
#5E88D7
oklch(63.2% 0.128 262.1)
-
Step 600
600
#4470C5
oklch(55.6% 0.141 262.2)
-
Step 700
700
#365DAA
oklch(49.1% 0.131 262.4)
-
Step 800
800
#2D4C89
oklch(42.5% 0.108 262.5)
-
Step 900
900 (this color)
#2B4371
oklch(38.7% 0.084 262.3)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#2B4371 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) | #2F4773 | 0.014 |
| Deuteranopia (no green cones) | #264170 | 0.009 |
| Tritanopia (no blue cones) | #004D54 | 0.073 |
| Achromatopsia (no color) | #444444 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4371
#2B4371
oklch(38.7% 0.084 262.3)
- #593F00
#593F00
oklch(38.6% 0.08 82.1)
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 #2B4371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.042
- Light Navy #155084 ΔE 0.046
- Cobalt #1E488F ΔE 0.051
- Marine Blue #01386A ΔE 0.053
- Deep Sea Blue #015482 ΔE 0.055
- Charcoal #264653 ΔE 0.056
- Dusk Blue #26538D ΔE 0.060
Use #2B4371 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.