#2B3F9B
Closest named color: Cobalt (#1E488F). oklch(41% 0.152 269.2), rgb(43, 63, 155).
Aa
White text reads best on this color (9.18:1).
About this color
#2B3F9B is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.152 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 9.18:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #2B3F9B |
| RGB | rgb(43, 63, 155) |
| HSL | hsl(229, 57%, 39%) |
| OKLCH | oklch(41% 0.152 269.2) |
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 #2B3F9B | 9.18:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #2B3F9B | 2.28:1 | Fails | Lc 13.3 | Not readable |
| #2B3F9B text on white | 9.18:1 | AAA | Lc 90.7 | Preferred for body text |
| #2B3F9B text on black | 2.28:1 | Fails | Lc -11.6 | 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 800.
-
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
#7D9BF9
oklch(70.8% 0.142 269.2)
-
Step 500
500
#5E7FF6
oklch(63.2% 0.181 269.1)
-
Step 600
600
#4764E4
oklch(55.5% 0.197 269.3)
-
Step 700
700
#3952C6
oklch(49% 0.182 269.2)
-
Step 800
800 (this color)
#2B3F9B
oklch(41% 0.152 269.2)
-
Step 900
900
#293B7F
oklch(37.8% 0.117 269)
-
Step 950
950
#18234B
oklch(27.1% 0.075 269.3)
#2B3F9B 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) | #004D9E | 0.040 |
| Deuteranopia (no green cones) | #004399 | 0.029 |
| Tritanopia (no blue cones) | #005666 | 0.123 |
| Achromatopsia (no color) | #484848 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B3F9B
#2B3F9B
oklch(41% 0.152 269.2)
- #5D4700
#5D4700
oklch(41% 0.084 88.3)
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 #2B3F9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Sapphire #2138AB ΔE 0.033
- Blueberry #464196 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.048
- Dusk Blue #26538D ΔE 0.061
- Twilight Blue #0A437A ΔE 0.064
- Light Navy #155084 ΔE 0.065
- Blue Blue #2242C7 ΔE 0.071
Use #2B3F9B 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.