#2B3B70
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.093 268.8), rgb(43, 59, 112).
Aa
White text reads best on this color (10.70:1).
About this color
#2B3B70 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.093 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.70:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #2B3B70 |
| RGB | rgb(43, 59, 112) |
| HSL | hsl(226, 45%, 30%) |
| OKLCH | oklch(36.8% 0.093 268.8) |
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 #2B3B70 | 10.70:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #2B3B70 | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #2B3B70 text on white | 10.70:1 | AAA | Lc 94.6 | Preferred for body text |
| #2B3B70 text on black | 1.96:1 | Fails | Lc -8.0 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F4
oklch(88.5% 0.039 267.9)
-
Step 300
300
#AEBFEF
oklch(80.8% 0.071 269.6)
-
Step 400
400
#849DE7
oklch(70.7% 0.112 269.2)
-
Step 500
500
#6683E0
oklch(63.1% 0.144 269)
-
Step 600
600
#4E6BCD
oklch(55.6% 0.155 268.6)
-
Step 700
700
#4058B2
oklch(49.1% 0.145 269.2)
-
Step 800
800
#344990
oklch(42.8% 0.12 268.6)
-
Step 900
900 (this color)
#2B3B70
oklch(36.8% 0.093 268.8)
-
Step 950
950
#1B2443
oklch(26.9% 0.059 269.9)
#2B3B70 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) | #234172 | 0.018 |
| Deuteranopia (no green cones) | #193B6F | 0.020 |
| Tritanopia (no blue cones) | #004750 | 0.082 |
| Achromatopsia (no color) | #3E3E3E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3B70
#2B3B70
oklch(36.8% 0.093 268.8)
- #4F3C00
#4F3C00
oklch(36.7% 0.075 88.5)
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 #2B3B70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Marine Blue #01386A ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.056
- Cobalt #1E488F ΔE 0.059
- Light Navy #155084 ΔE 0.065
- Marine #042E60 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.065
Use #2B3B70 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.