#2B3D8B
Closest named color: Cobalt (#1E488F). oklch(39.3% 0.131 269.6), rgb(43, 61, 139).
Aa
White text reads best on this color (9.79:1).
About this color
#2B3D8B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.131 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.030 away. White text reads best on it, at 9.79:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.14:1 |
| White text | 9.79:1 |
Values
| HEX | #2B3D8B |
| RGB | rgb(43, 61, 139) |
| HSL | hsl(229, 53%, 36%) |
| OKLCH | oklch(39.3% 0.131 269.6) |
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 #2B3D8B | 9.79:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #2B3D8B | 2.14:1 | Fails | Lc 11.6 | Not readable |
| #2B3D8B text on white | 9.79:1 | AAA | Lc 92.4 | Preferred for body text |
| #2B3D8B text on black | 2.14:1 | Fails | Lc -10.1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2EAFE
oklch(93.7% 0.028 268.4)
-
Step 200
200
#CBD8FE
oklch(88.5% 0.054 270.4)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7B9AFF
oklch(70.8% 0.152 269.4)
-
Step 500
500
#5C7CFF
oklch(63.1% 0.197 269.6)
-
Step 600
600
#4460F1
oklch(55.7% 0.219 269.5)
-
Step 700
700
#374DD2
oklch(49.1% 0.205 269.7)
-
Step 800
800
#2D41A9
oklch(42.7% 0.168 269.5)
-
Step 900
900 (this color)
#2B3D8B
oklch(39.3% 0.131 269.6)
-
Step 950
950
#17224E
oklch(27% 0.082 269.6)
#2B3D8B 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) | #00488E | 0.037 |
| Deuteranopia (no green cones) | #003F89 | 0.032 |
| Tritanopia (no blue cones) | #00505E | 0.108 |
| Achromatopsia (no color) | #444444 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3D8B
#2B3D8B
oklch(39.3% 0.131 269.6)
- #574300
#574300
oklch(39.3% 0.08 89.3)
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 #2B3D8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.030
- Dark Slate Blue #483D8B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.043
- Blueberry #464196 ΔE 0.045
- Sapphire #2138AB ΔE 0.055
- Light Navy #155084 ΔE 0.057
- Dusk Blue #26538D ΔE 0.061
- Marine Blue #01386A ΔE 0.070
Use #2B3D8B 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.