#1F3356
Closest named color: Prussian Blue (#1D3557). oklch(32.3% 0.068 260.9), rgb(31, 51, 86).
Aa
White text reads best on this color (12.60:1).
About this color
#1F3356 is a dark, muted blue. In OKLCH its lightness is 32%, its chroma 0.068 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.006 away. White text reads best on it, at 12.60:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.66:1 |
| White text | 12.60:1 |
Values
| HEX | #1F3356 |
| RGB | rgb(31, 51, 86) |
| HSL | hsl(218, 47%, 23%) |
| OKLCH | oklch(32.3% 0.068 260.9) |
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 #1F3356 | 12.60:1 | AAA | Lc -101.8 | Preferred for body text |
| Black text on #1F3356 | 1.66:1 | Fails | Lc 0.0 | Not readable |
| #1F3356 text on white | 12.60:1 | AAA | Lc 98.5 | Preferred for body text |
| #1F3356 text on black | 1.66:1 | 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
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF7
oklch(88.5% 0.044 261.2)
-
Step 300
300
#A3C2F5
oklch(80.9% 0.08 260.3)
-
Step 400
400
#72A0F0
oklch(70.7% 0.128 260.9)
-
Step 500
500
#4D86EB
oklch(63.1% 0.164 260.9)
-
Step 600
600
#306DDA
oklch(55.6% 0.179 261)
-
Step 700
700
#235ABD
oklch(49% 0.167 261.1)
-
Step 800
800
#1E4A99
oklch(42.6% 0.138 261)
-
Step 900
900
#1E3F79
oklch(37.7% 0.106 260.8)
-
Step 950
950 (this color)
#1F3356
oklch(32.3% 0.068 260.9)
#1F3356 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) | #243657 | 0.012 |
| Deuteranopia (no green cones) | #1D3155 | 0.007 |
| Tritanopia (no blue cones) | #003B40 | 0.059 |
| Achromatopsia (no color) | #333333 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F3356
#1F3356
oklch(32.3% 0.068 260.9)
- #452F00
#452F00
oklch(32.3% 0.067 80.4)
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 #1F3356, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.006
- Dark Blue Grey #1F3B4D ΔE 0.034
- Marine #042E60 ΔE 0.036
- Space Cadet #2B2D42 ΔE 0.039
- Gunmetal #293241 ΔE 0.039
- Marine Blue #01386A ΔE 0.040
- Midnight Green #073B4C ΔE 0.040
- Onyx #343A40 ΔE 0.059
Use #1F3356 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.