#2B4172
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.088 264.4), rgb(43, 65, 114).
Aa
White text reads best on this color (9.99:1).
About this color
#2B4172 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.088 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.028 away. White text reads best on it, at 9.99:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.99:1 |
Values
| HEX | #2B4172 |
| RGB | rgb(43, 65, 114) |
| HSL | hsl(221, 45%, 31%) |
| OKLCH | oklch(38.3% 0.088 264.4) |
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 #2B4172 | 9.99:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #2B4172 | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #2B4172 text on white | 9.99:1 | AAA | Lc 93.0 | Preferred for body text |
| #2B4172 text on black | 2.10:1 | Fails | Lc -9.5 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDD9F2
oklch(88.4% 0.037 265.1)
-
Step 300
300
#ABC1EC
oklch(80.9% 0.066 263.7)
-
Step 400
400
#7F9FE3
oklch(70.6% 0.106 264.5)
-
Step 500
500
#6086DB
oklch(63.1% 0.135 264.6)
-
Step 600
600
#476EC9
oklch(55.6% 0.148 264.6)
-
Step 700
700
#385CAD
oklch(49.1% 0.136 264)
-
Step 800
800
#2F4B8C
oklch(42.6% 0.113 264.6)
-
Step 900
900 (this color)
#2B4172
oklch(38.3% 0.088 264.4)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#2B4172 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) | #2C4674 | 0.015 |
| Deuteranopia (no green cones) | #223F71 | 0.013 |
| Tritanopia (no blue cones) | #004C54 | 0.077 |
| Achromatopsia (no color) | #424242 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4172
#2B4172
oklch(38.3% 0.088 264.4)
- #573F00
#573F00
oklch(38.4% 0.079 84.1)
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 #2B4172, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.047
- Light Navy #155084 ΔE 0.049
- Marine Blue #01386A ΔE 0.050
- Cobalt #1E488F ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.059
- Prussian Blue #1D3557 ΔE 0.060
- Charcoal #264653 ΔE 0.061
Use #2B4172 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.