#0B3B91
Closest named color: Cobalt (#1E488F). oklch(38.1% 0.151 261.3), rgb(11, 59, 145).
Aa
White text reads best on this color (10.25:1).
About this color
#0B3B91 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.151 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.040 away. White text reads best on it, at 10.25:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.04:1 |
| White text | 10.25:1 |
Values
| HEX | #0B3B91 |
| RGB | rgb(11, 59, 145) |
| HSL | hsl(219, 86%, 31%) |
| OKLCH | oklch(38.1% 0.151 261.3) |
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 #0B3B91 | 10.25:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #0B3B91 | 2.04:1 | Fails | Lc 10.8 | Not readable |
| #0B3B91 text on white | 10.25:1 | AAA | Lc 93.1 | Preferred for body text |
| #0B3B91 text on black | 2.04:1 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFF
oklch(93.7% 0.03 260.7)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9EC1FF
oklch(80.8% 0.096 261.6)
-
Step 400
400
#699FFF
oklch(70.8% 0.152 261.1)
-
Step 500
500
#3E82FF
oklch(63% 0.199 261.3)
-
Step 600
600
#0062FF
oklch(55.6% 0.245 261.3)
-
Step 700
700
#0052D8
oklch(49.1% 0.216 261.3)
-
Step 800
800
#0043B3
oklch(42.8% 0.187 261.2)
-
Step 900
900 (this color)
#0B3B91
oklch(38.1% 0.151 261.3)
-
Step 950
950
#082354
oklch(27% 0.095 261.1)
#0B3B91 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) | #004794 | 0.032 |
| Deuteranopia (no green cones) | #003B8F | 0.006 |
| Tritanopia (no blue cones) | #005160 | 0.115 |
| Achromatopsia (no color) | #414141 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B3B91
#0B3B91
oklch(38.1% 0.151 261.3)
- #583D00
#583D00
oklch(38.1% 0.079 80.4)
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 #0B3B91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.040
- Sapphire #2138AB ΔE 0.046
- Twilight Blue #0A437A ΔE 0.046
- Light Navy #155084 ΔE 0.067
- Marine Blue #01386A ΔE 0.067
- Blueberry #464196 ΔE 0.071
- Dark Slate Blue #483D8B ΔE 0.072
- Royal #0C1793 ΔE 0.074
Use #0B3B91 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.