#1F3163
Closest named color: Prussian Blue (#1D3557). oklch(32.7% 0.091 266.5), rgb(31, 49, 99).
Aa
White text reads best on this color (12.51:1).
About this color
#1F3163 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.091 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 12.51:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.67:1 |
| White text | 12.51:1 |
Values
| HEX | #1F3163 |
| RGB | rgb(31, 49, 99) |
| HSL | hsl(224, 52%, 25%) |
| OKLCH | oklch(32.7% 0.091 266.5) |
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 #1F3163 | 12.51:1 | AAA | Lc -101.6 | Preferred for body text |
| Black text on #1F3163 | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #1F3163 text on white | 12.51:1 | AAA | Lc 98.2 | Preferred for body text |
| #1F3163 text on black | 1.67:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CED9F3
oklch(88.5% 0.038 267.3)
-
Step 300
300
#ACC0EE
oklch(80.9% 0.069 266.5)
-
Step 400
400
#819EE5
oklch(70.6% 0.11 266.7)
-
Step 500
500
#6285DE
oklch(63.2% 0.14 266.3)
-
Step 600
600
#4A6CCB
oklch(55.5% 0.152 266.7)
-
Step 700
700
#3B5AB0
oklch(49.1% 0.142 266.4)
-
Step 800
800
#314A8E
oklch(42.7% 0.116 266.4)
-
Step 900
900 (this color)
#1F3163
oklch(32.7% 0.091 266.5)
-
Step 950
950
#192543
oklch(27% 0.058 266.1)
#1F3163 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) | #183765 | 0.018 |
| Deuteranopia (no green cones) | #0A3162 | 0.020 |
| Tritanopia (no blue cones) | #003D45 | 0.077 |
| Achromatopsia (no color) | #343434 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3163
#1F3163
oklch(32.7% 0.091 266.5)
- #443200
#443200
oklch(32.9% 0.067 86.5)
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 #1F3163, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.028
- Marine Blue #01386A ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.059
- Midnight Green #073B4C ΔE 0.060
- Twilight Blue #0A437A ΔE 0.061
- Gunmetal #293241 ΔE 0.063
Use #1F3163 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.