#2B3A7D
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.115 270.5), rgb(43, 58, 125).
Aa
White text reads best on this color (10.47:1).
About this color
#2B3A7D is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.115 and its hue 270°. 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 10.47:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.00:1 |
| White text | 10.47:1 |
Values
| HEX | #2B3A7D |
| RGB | rgb(43, 58, 125) |
| HSL | hsl(229, 49%, 33%) |
| OKLCH | oklch(37.5% 0.115 270.5) |
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 #2B3A7D | 10.47:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #2B3A7D | 2.00:1 | Fails | Lc 9.9 | Not readable |
| #2B3A7D text on white | 10.47:1 | AAA | Lc 94.0 | Preferred for body text |
| #2B3A7D 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
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8FA
oklch(88.5% 0.048 271.2)
-
Step 300
300
#ABBEF9
oklch(80.8% 0.086 270.6)
-
Step 400
400
#809AF6
oklch(70.6% 0.138 270.6)
-
Step 500
500
#627EF2
oklch(63% 0.176 270.5)
-
Step 600
600
#4C64E1
oklch(55.6% 0.191 270.7)
-
Step 700
700
#3D52C4
oklch(49.1% 0.179 270.5)
-
Step 800
800
#32449E
oklch(42.7% 0.147 270.4)
-
Step 900
900 (this color)
#2B3A7D
oklch(37.5% 0.115 270.5)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#2B3A7D 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) | #12437F | 0.031 |
| Deuteranopia (no green cones) | #003C7C | 0.034 |
| Tritanopia (no blue cones) | #004A55 | 0.098 |
| Achromatopsia (no color) | #3F3F3F | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3A7D
#2B3A7D
oklch(37.5% 0.115 270.5)
- #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 #2B3A7D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.046
- Marine Blue #01386A ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Blueberry #464196 ΔE 0.062
- Light Navy #155084 ΔE 0.062
- Prussian Blue #1D3557 ΔE 0.070
- Dusk Blue #26538D ΔE 0.072
Use #2B3A7D 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.