#2B3B7A
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.109 269.8), rgb(43, 59, 122).
Aa
White text reads best on this color (10.45:1).
About this color
#2B3B7A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.109 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.033 away. White text reads best on it, at 10.45:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.45:1 |
Values
| HEX | #2B3B7A |
| RGB | rgb(43, 59, 122) |
| HSL | hsl(228, 48%, 32%) |
| OKLCH | oklch(37.5% 0.109 269.8) |
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 #2B3B7A | 10.45:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #2B3B7A | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #2B3B7A text on white | 10.45:1 | AAA | Lc 94.0 | Preferred for body text |
| #2B3B7A text on black | 2.00:1 | Fails | Lc -8.5 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CDD8F8
oklch(88.4% 0.046 270.4)
-
Step 300
300
#ACBFF6
oklch(81% 0.081 269.7)
-
Step 400
400
#819BF2
oklch(70.6% 0.131 270.2)
-
Step 500
500
#6380ED
oklch(63.1% 0.166 269.9)
-
Step 600
600
#4B66DC
oklch(55.5% 0.182 269.8)
-
Step 700
700
#3D54BF
oklch(49.1% 0.169 269.9)
-
Step 800
800
#32469A
oklch(42.7% 0.139 269.6)
-
Step 900
900 (this color)
#2B3B7A
oklch(37.5% 0.109 269.8)
-
Step 950
950
#192348
oklch(26.9% 0.07 269.8)
#2B3B7A 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) | #19437C | 0.026 |
| Deuteranopia (no green cones) | #073C79 | 0.031 |
| Tritanopia (no blue cones) | #004954 | 0.093 |
| Achromatopsia (no color) | #3F3F3F | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3B7A
#2B3B7A
oklch(37.5% 0.109 269.8)
- #513F00
#513F00
oklch(37.6% 0.077 90.4)
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 #2B3B7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.033
- Cobalt #1E488F ΔE 0.047
- Marine Blue #01386A ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.054
- Light Navy #155084 ΔE 0.060
- Blueberry #464196 ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.069
Use #2B3B7A 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.