#2B3C84
Closest named color: Cobalt (#1E488F). oklch(38.5% 0.122 269.8), rgb(43, 60, 132).
Aa
White text reads best on this color (10.08:1).
About this color
#2B3C84 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.122 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.036 away. White text reads best on it, at 10.08:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.08:1 |
| White text | 10.08:1 |
Values
| HEX | #2B3C84 |
| RGB | rgb(43, 60, 132) |
| HSL | hsl(229, 51%, 34%) |
| OKLCH | oklch(38.5% 0.122 269.8) |
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 #2B3C84 | 10.08:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #2B3C84 | 2.08:1 | Fails | Lc 10.8 | Not readable |
| #2B3C84 text on white | 10.08:1 | AAA | Lc 93.1 | Preferred for body text |
| #2B3C84 text on black | 2.08:1 | Fails | Lc -9.4 | 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
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#A9BEFD
oklch(80.8% 0.092 270)
-
Step 400
400
#7D9AFC
oklch(70.7% 0.147 269.9)
-
Step 500
500
#5E7DF9
oklch(63% 0.188 269.8)
-
Step 600
600
#4762E8
oklch(55.5% 0.204 269.8)
-
Step 700
700
#3A50CA
oklch(49.1% 0.19 270)
-
Step 800
800
#2F43A3
oklch(42.7% 0.156 269.6)
-
Step 900
900 (this color)
#2B3C84
oklch(38.5% 0.122 269.8)
-
Step 950
950
#18224C
oklch(26.9% 0.079 270.3)
#2B3C84 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) | #0D4687 | 0.033 |
| Deuteranopia (no green cones) | #003E83 | 0.032 |
| Tritanopia (no blue cones) | #004D5A | 0.101 |
| Achromatopsia (no color) | #424242 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3C84
#2B3C84
oklch(38.5% 0.122 269.8)
- #544100
#544100
oklch(38.5% 0.079 89.8)
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 #2B3C84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.036
- Twilight Blue #0A437A ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.052
- Light Navy #155084 ΔE 0.057
- Marine Blue #01386A ΔE 0.060
- Dusk Blue #26538D ΔE 0.064
- Sapphire #2138AB ΔE 0.066
Use #2B3C84 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.