#1B3154
Closest named color: Prussian Blue (#1D3557). oklch(31.4% 0.069 259.3), rgb(27, 49, 84).
Aa
White text reads best on this color (13.01:1).
About this color
#1B3154 is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.069 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.014 away. White text reads best on it, at 13.01:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.61:1 |
| White text | 13.01:1 |
Values
| HEX | #1B3154 |
| RGB | rgb(27, 49, 84) |
| HSL | hsl(217, 51%, 22%) |
| OKLCH | oklch(31.4% 0.069 259.3) |
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 #1B3154 | 13.01:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #1B3154 | 1.61:1 | Fails | Lc 0.0 | Not readable |
| #1B3154 text on white | 13.01:1 | AAA | Lc 99.1 | Preferred for body text |
| #1B3154 text on black | 1.61:1 | 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 950.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A1C2F6
oklch(80.8% 0.082 259.4)
-
Step 400
400
#6EA1F1
oklch(70.7% 0.13 259.1)
-
Step 500
500
#4687ED
oklch(63.2% 0.167 259.1)
-
Step 600
600
#276EDB
oklch(55.6% 0.181 259.2)
-
Step 700
700
#1A5BBE
oklch(49.1% 0.169 259.3)
-
Step 800
800
#184B9A
oklch(42.7% 0.14 259.3)
-
Step 900
900
#1A3F7A
oklch(37.6% 0.109 259.5)
-
Step 950
950 (this color)
#1B3154
oklch(31.4% 0.069 259.3)
#1B3154 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) | #223455 | 0.014 |
| Deuteranopia (no green cones) | #1A2F53 | 0.007 |
| Tritanopia (no blue cones) | #00393E | 0.058 |
| Achromatopsia (no color) | #313131 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B3154
#1B3154
oklch(31.4% 0.069 259.3)
- #432D00
#432D00
oklch(31.5% 0.065 79.5)
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 #1B3154, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.014
- Marine #042E60 ΔE 0.031
- Space Cadet #2B2D42 ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.039
- Gunmetal #293241 ΔE 0.039
- Midnight Green #073B4C ΔE 0.041
- Marine Blue #01386A ΔE 0.042
- Oxford Blue #1B263B ΔE 0.053
Use #1B3154 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.