#1B3992
Closest named color: Cobalt (#1E488F). oklch(38.3% 0.151 265.4), rgb(27, 57, 146).
Aa
White text reads best on this color (10.25:1).
About this color
#1B3992 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.151 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.041 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 | #1B3992 |
| RGB | rgb(27, 57, 146) |
| HSL | hsl(225, 69%, 34%) |
| OKLCH | oklch(38.3% 0.151 265.4) |
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 #1B3992 | 10.25:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #1B3992 | 2.04:1 | Fails | Lc 10.7 | Not readable |
| #1B3992 text on white | 10.25:1 | AAA | Lc 93.2 | Preferred for body text |
| #1B3992 text on black | 2.04:1 | Fails | Lc -9.3 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4E7FFF
oklch(63% 0.198 265.3)
-
Step 600
600
#2C5EFF
oklch(55.6% 0.244 265.3)
-
Step 700
700
#1F4AE2
oklch(49.1% 0.233 265.4)
-
Step 800
800
#1A3EB7
oklch(42.7% 0.194 265.4)
-
Step 900
900 (this color)
#1B3992
oklch(38.3% 0.151 265.4)
-
Step 950
950
#0F2154
oklch(26.8% 0.096 265.5)
#1B3992 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) | #004695 | 0.034 |
| Deuteranopia (no green cones) | #003B90 | 0.016 |
| Tritanopia (no blue cones) | #00505F | 0.119 |
| Achromatopsia (no color) | #414141 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3992
#1B3992
oklch(38.3% 0.151 265.4)
- #563F00
#563F00
oklch(38.3% 0.078 85.1)
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 #1B3992, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.041
- Sapphire #2138AB ΔE 0.042
- Twilight Blue #0A437A ΔE 0.051
- Blueberry #464196 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.064
- Light Navy #155084 ΔE 0.070
- Marine Blue #01386A ΔE 0.072
- Royal #0C1793 ΔE 0.073
Use #1B3992 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.