#1F3156
Closest named color: Prussian Blue (#1D3557). oklch(31.8% 0.07 263.3), rgb(31, 49, 86).
Aa
White text reads best on this color (12.86:1).
About this color
#1F3156 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.070 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.012 away. White text reads best on it, at 12.86:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.63:1 |
| White text | 12.86:1 |
Values
| HEX | #1F3156 |
| RGB | rgb(31, 49, 86) |
| HSL | hsl(220, 47%, 23%) |
| OKLCH | oklch(31.8% 0.07 263.3) |
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 #1F3156 | 12.86:1 | AAA | Lc -102.2 | Preferred for body text |
| Black text on #1F3156 | 1.63:1 | Fails | Lc 0.0 | Not readable |
| #1F3156 text on white | 12.86:1 | AAA | Lc 98.9 | Preferred for body text |
| #1F3156 text on black | 1.63:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A5C1F7
oklch(80.9% 0.083 263.3)
-
Step 400
400
#749FF4
oklch(70.8% 0.134 263)
-
Step 500
500
#5184EF
oklch(63.1% 0.17 263.2)
-
Step 600
600
#366ADE
oklch(55.5% 0.186 263.4)
-
Step 700
700
#2958C1
oklch(49.1% 0.173 263.3)
-
Step 800
800
#23499C
oklch(42.8% 0.142 263.2)
-
Step 900
900
#213E7C
oklch(37.8% 0.111 263.2)
-
Step 950
950 (this color)
#1F3156
oklch(31.8% 0.07 263.3)
#1F3156 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) | #213457 | 0.010 |
| Deuteranopia (no green cones) | #1A2F55 | 0.010 |
| Tritanopia (no blue cones) | #00393F | 0.061 |
| Achromatopsia (no color) | #323232 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3156
#1F3156
oklch(31.8% 0.07 263.3)
- #422F00
#422F00
oklch(31.9% 0.065 84.1)
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 #1F3156, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.012
- Marine #042E60 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.040
- Gunmetal #293241 ΔE 0.041
- Marine Blue #01386A ΔE 0.041
- Midnight Green #073B4C ΔE 0.044
- Oxford Blue #1B263B ΔE 0.056
Use #1F3156 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.