#2B3B84
Closest named color: Cobalt (#1E488F). oklch(38.3% 0.124 270.3), rgb(43, 59, 132).
Aa
White text reads best on this color (10.18:1).
About this color
#2B3B84 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.124 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.038 away. White text reads best on it, at 10.18:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.06:1 |
| White text | 10.18:1 |
Values
| HEX | #2B3B84 |
| RGB | rgb(43, 59, 132) |
| HSL | hsl(229, 51%, 34%) |
| OKLCH | oklch(38.3% 0.124 270.3) |
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 #2B3B84 | 10.18:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #2B3B84 | 2.06:1 | Fails | Lc 10.6 | Not readable |
| #2B3B84 text on white | 10.18:1 | AAA | Lc 93.3 | Preferred for body text |
| #2B3B84 text on black | 2.06:1 | Fails | Lc -9.2 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#A9BEFD
oklch(80.8% 0.092 270)
-
Step 400
400
#7D9AFD
oklch(70.8% 0.149 270)
-
Step 500
500
#5F7DFA
oklch(63.2% 0.189 270.1)
-
Step 600
600
#4862EA
oklch(55.7% 0.206 270.1)
-
Step 700
700
#3B50CB
oklch(49.2% 0.191 270.3)
-
Step 800
800
#3042A4
oklch(42.7% 0.159 270.3)
-
Step 900
900 (this color)
#2B3B84
oklch(38.3% 0.124 270.3)
-
Step 950
950
#18224C
oklch(26.9% 0.079 270.3)
#2B3B84 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) | #084587 | 0.035 |
| Deuteranopia (no green cones) | #003D83 | 0.033 |
| Tritanopia (no blue cones) | #004C59 | 0.103 |
| Achromatopsia (no color) | #414141 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3B84
#2B3B84
oklch(38.3% 0.124 270.3)
- #534100
#534100
oklch(38.4% 0.078 90.9)
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 #2B3B84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.038
- Twilight Blue #0A437A ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.046
- Blueberry #464196 ΔE 0.053
- Light Navy #155084 ΔE 0.060
- Marine Blue #01386A ΔE 0.060
- Sapphire #2138AB ΔE 0.066
- Dusk Blue #26538D ΔE 0.067
Use #2B3B84 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.