#2B3D83
Closest named color: Cobalt (#1E488F). oklch(38.6% 0.12 269.3), rgb(43, 61, 131).
Aa
White text reads best on this color (10.00:1).
About this color
#2B3D83 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.120 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 10.00:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.09:1 |
| White text | 10.00:1 |
Values
| HEX | #2B3D83 |
| RGB | rgb(43, 61, 131) |
| HSL | hsl(228, 51%, 34%) |
| OKLCH | oklch(38.6% 0.12 269.3) |
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 #2B3D83 | 10.00:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #2B3D83 | 2.09:1 | Fails | Lc 11.0 | Not readable |
| #2B3D83 text on white | 10.00:1 | AAA | Lc 92.9 | Preferred for body text |
| #2B3D83 text on black | 2.09:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3EAFC
oklch(93.7% 0.025 268.8)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#A9BFFB
oklch(81% 0.089 268.8)
-
Step 400
400
#7D9BFA
oklch(70.8% 0.143 269.3)
-
Step 500
500
#5E7EF7
oklch(63.1% 0.184 269.4)
-
Step 600
600
#4764E6
oklch(55.7% 0.199 269.3)
-
Step 700
700
#3952C8
oklch(49.2% 0.185 269.3)
-
Step 800
800
#2F44A1
oklch(42.7% 0.152 269.3)
-
Step 900
900 (this color)
#2B3D83
oklch(38.6% 0.12 269.3)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#2B3D83 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) | #134685 | 0.030 |
| Deuteranopia (no green cones) | #003E82 | 0.032 |
| Tritanopia (no blue cones) | #004D5A | 0.098 |
| Achromatopsia (no color) | #424242 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3D83
#2B3D83
oklch(38.6% 0.12 269.3)
- #554100
#554100
oklch(38.6% 0.079 88.8)
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 #2B3D83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Twilight Blue #0A437A ΔE 0.035
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.053
- Light Navy #155084 ΔE 0.054
- Marine Blue #01386A ΔE 0.060
- Dusk Blue #26538D ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.068
Use #2B3D83 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.