#1F3263
Closest named color: Prussian Blue (#1D3557). oklch(33% 0.09 265.8), rgb(31, 50, 99).
Aa
White text reads best on this color (12.39:1).
About this color
#1F3263 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.090 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.025 away. White text reads best on it, at 12.39:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.69:1 |
| White text | 12.39:1 |
Values
| HEX | #1F3263 |
| RGB | rgb(31, 50, 99) |
| HSL | hsl(223, 52%, 25%) |
| OKLCH | oklch(33% 0.09 265.8) |
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 #1F3263 | 12.39:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #1F3263 | 1.69:1 | Fails | Lc 0.0 | Not readable |
| #1F3263 text on white | 12.39:1 | AAA | Lc 98.0 | Preferred for body text |
| #1F3263 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ACC0ED
oklch(80.8% 0.068 266.1)
-
Step 400
400
#819FE4
oklch(70.8% 0.107 265.8)
-
Step 500
500
#6185DC
oklch(63% 0.138 265.7)
-
Step 600
600
#496DCA
oklch(55.6% 0.15 265.8)
-
Step 700
700
#3A5BAF
oklch(49.2% 0.139 265.5)
-
Step 800
800
#304A8E
oklch(42.6% 0.117 265.9)
-
Step 900
900 (this color)
#1F3263
oklch(33% 0.09 265.8)
-
Step 950
950
#192542
oklch(27% 0.057 265.8)
#1F3263 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) | #1A3865 | 0.018 |
| Deuteranopia (no green cones) | #0D3162 | 0.019 |
| Tritanopia (no blue cones) | #003D45 | 0.075 |
| Achromatopsia (no color) | #343434 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3263
#1F3263
oklch(33% 0.09 265.8)
- #453200
#453200
oklch(33% 0.068 85.3)
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 #1F3263, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.025
- Marine Blue #01386A ΔE 0.027
- Marine #042E60 ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.054
- Midnight Green #073B4C ΔE 0.059
- Twilight Blue #0A437A ΔE 0.059
- Space Cadet #2B2D42 ΔE 0.059
- Gunmetal #293241 ΔE 0.062
Use #1F3263 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.