#1B306E
Closest named color: Marine Blue (#01386A). oklch(33.2% 0.111 266.3), rgb(27, 48, 110).
Aa
White text reads best on this color (12.39:1).
About this color
#1B306E is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.111 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.028 away. White text reads best on it, at 12.39:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.69:1 |
| White text | 12.39:1 |
Values
| HEX | #1B306E |
| RGB | rgb(27, 48, 110) |
| HSL | hsl(225, 61%, 27%) |
| OKLCH | oklch(33.2% 0.111 266.3) |
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 #1B306E | 12.39:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #1B306E | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #1B306E text on white | 12.39:1 | AAA | Lc 97.8 | Preferred for body text |
| #1B306E text on black | 1.69:1 | Fails | Lc 0.0 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F7
oklch(80.9% 0.083 266.3)
-
Step 400
400
#7A9DF4
oklch(70.7% 0.134 266.4)
-
Step 500
500
#5982EF
oklch(63.1% 0.17 266.2)
-
Step 600
600
#4068DE
oklch(55.5% 0.186 266.3)
-
Step 700
700
#3356C1
oklch(49.1% 0.173 266.3)
-
Step 800
800
#2A479C
oklch(42.7% 0.143 266.2)
-
Step 900
900 (this color)
#1B306E
oklch(33.2% 0.111 266.3)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#1B306E 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) | #033870 | 0.025 |
| Deuteranopia (no green cones) | #00316D | 0.020 |
| Tritanopia (no blue cones) | #003F4A | 0.089 |
| Achromatopsia (no color) | #343434 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B306E
#1B306E
oklch(33.2% 0.111 266.3)
- #453300
#453300
oklch(33.2% 0.068 86.9)
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 #1B306E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.028
- Marine #042E60 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.045
- Twilight Blue #0A437A ΔE 0.056
- Midnight Blue #191970 ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.073
- Midnight Green #073B4C ΔE 0.077
- Space Cadet #2B2D42 ΔE 0.079
Use #1B306E 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.